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Solar eclipse of April 8, 2024
Solar eclipse of April 8, 2024
Solar eclipse of April 8, 2024
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Solar eclipse of April 8, 2024
Total eclipse
The solar eclipse during totality, seen from Dallas, Texas
Map
Gamma0.3431
Magnitude1.0566
Maximum eclipse
Duration268 s (4 min 28 s)
LocationNazas, Durango, Mexico
Coordinates25°18′N 104°06′W / 25.3°N 104.1°W / 25.3; -104.1
Max. width of band198 km (123 mi)
Times (UTC)
(P1) Partial begin15:42:07
(U1) Total begin16:38:44
Greatest eclipse18:18:29
(U4) Total end19:55:29
(P4) Partial end20:52:14
References
Saros139 (30 of 71)
Catalog # (SE5000)9561

The solar eclipse of April 8, 2024, also known as the Great North American Eclipse,[1][2] was a total solar eclipse visible across a band covering parts of North America, from Mexico to Canada and crossing the contiguous United States. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the Sun. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, which blocks all direct sunlight and allows some of the Sun's corona and solar prominences to be seen. Totality occurs only in a limited path across Earth's surface, with the partial solar eclipse visible over a larger surrounding region.

During this eclipse, the Moon's apparent diameter was 5.5 percent larger than average due to occurring about a day after perigee. With a magnitude of 1.0566, the eclipse's longest duration of totality was 4 minutes and 28 seconds near the Mexican town of Nazas, Durango.[3][4]

This particular eclipse occurred at the Moon's ascending node of orbit. Totality was visible from 6 Mexican states, 15 U.S. states, and 6 Canadian provinces.[5] Approximately 44 million people lived in the path of totality, including 32 million in the United States, 6 million in Canada, and 6 million in Mexico.[6][7][8] The 10 largest cities in the path of totality accounted for a third of this population (5 of the 10 largest cities being in the United States, 3 in Mexico, and 2 in Canada).[9] Adding people who travelled to the path of totality, an estimated 50 million people experienced the total solar eclipse.[9] Meanwhile, about 652 million people experienced a partial solar eclipse.[6]

This eclipse was the first total solar eclipse visible from Canada since August 1, 2008, and from the provinces since February 26, 1979.[10][11] It was the first over Mexico since July 11, 1991.[12] It was also the first over the United States since August 21, 2017. This is the only solar eclipse in the 21st century with totality visible from all three countries.[13] The next total solar eclipse in the US will be on March 30, 2033, which will pass over Alaska. The next total eclipse in the contiguous United States of the US will be on August 23, 2044. The next total eclipse of similar width will take place on August 12, 2045, which will traverse coast-to-coast in a trajectory similar to the 2017 eclipse.

General path of shadow

[edit]
Animation of the eclipse path (including the path of totality)

The totality of the solar eclipse was visible in a strip beginning in the Pacific Ocean, the edge of which passed approximately 60 kilometers north of Penrhyn atoll,[14] 115 kilometers south of Starbuck Island, 275 kilometers north of Vostok Island, and 370 kilometers north of the Marquesas Islands. Later, the total solar eclipse was visible from North America, starting from the west coast of Mexico then ascending in a northeasterly direction through Mexico, the United States, and Canada, before ending in the Atlantic Ocean about 700 kilometers southwest of Ireland.[15]

Visibility in the Americas

[edit]

Mexico

[edit]
Ten-minute time lapse video of the total solar eclipse on April 8, 2024, in Mazatlán, Sinaloa.

Totality first passed over the Revillagigedo Islands (a federal possession of Mexico and associated with Colima state) and Islas Marías of Nayarit. Upon reaching the continental mainland, totality passed through the states of Sinaloa (including Mazatlán), northern Nayarit, Durango (including the city of Durango and Gómez Palacio), extreme southeast Chihuahua, and Coahuila (including Torreón, Matamoros, Monclova, Sabinas, Ciudad Acuña, and Piedras Negras).[16][17][18] A partial eclipse was visible across the remainder of the country, including 79% coverage of the solar disc in Mexico City.[19] Torreón was the most populous Mexican city in the path of totality.

United States

[edit]
Solar eclipse progression as seen over the Terminal Tower in Cleveland, Ohio
Solar eclipse seen from the roof of the Joint Force Headquarters building in Lincoln, Nebraska, April 8, 2024.

In the United States, totality was visible through the states of Texas (including parts of San Antonio, Austin, Fort Worth, and all of Arlington, Dallas, Killeen, Temple, Texarkana, Tyler, Sulphur Springs, and Waco); Oklahoma (including Idabel and Broken Bow); Arkansas (including Morrilton/Petit Jean, Hot Springs, Searcy, Jonesboro, and Little Rock); Missouri (including Cape Girardeau and Poplar Bluff); Tennessee (extreme northwestern corner of Lake County); Illinois (including Carbondale, where it intersected the path of the 2017 eclipse); Kentucky; Indiana (including Bloomington, Evansville, Indianapolis, Anderson, Muncie, Terre Haute, and Vincennes); Ohio (including Akron, Cleveland, Dayton, Lima, Lorain,Toledo, and Warren); Michigan (extreme southeastern corner of Monroe County); Pennsylvania (including Erie); Upstate New York (including Buffalo, Niagara Falls, Rochester, Syracuse, Watertown, the Adirondacks, Potsdam, and Plattsburgh); northern Vermont (including Burlington); New Hampshire; and Maine;[20][21] with the line of totality going almost directly over the state's highest point Mount Katahdin. The largest city that was entirely in the path was Dallas, Texas.[22] It was the second total eclipse visible from the central United States in just seven years, after the eclipse of August 21, 2017. It was the last total solar eclipse visible in the contiguous United States until August 23, 2044.[23]

A partial solar eclipse was visible in all of the other parts of the contiguous United States, Hawaii, and southeast Alaska (Alaska Panhandle).[24]

Delta Air Lines scheduled two special eclipse-following flights: one from Austin to Detroit on a large-window A220-300, and one from Dallas to Detroit.[25] Various other flights in the path of totality also avoided cloud cover entirely.[26]

Canada

[edit]
Video of total eclipse in Saint-Georges, Quebec, on 8 April 2024

In Canada, totality was visible through parts of Southern Ontario (including Leamington, Fort Erie,[27] Hamilton, Niagara Falls, Kingston, Prince Edward County, and Cornwall),[28] parts of southern Quebec (including Montreal, Sherbrooke, Saint-Georges, and Lac-Mégantic), central New Brunswick (including Fredericton, Woodstock and Miramichi),[29] western Prince Edward Island (including Tignish and Summerside),[30][31] the northern tip of Cape Breton Island, Nova Scotia,[32] and central Newfoundland (including Gander and Grand Falls-Windsor). Then, it ended on the eastern Atlantic coast of Newfoundland.[33] The most populous Canadian city that the path of totality intersected was Montreal. Windsor, London, Toronto, and Ottawa lay just north of the path of totality, and Moncton just south of it.[34][35]

A partial solar eclipse was visible in all of the other parts of Canada, except the western part of Yukon and the western tip of the Northwest Territories.[36][37]

Boat cruises to observe the eclipse were conducted on Lake Erie, Niagara River, Lake Ontario, and Saint Lawrence River.[38]

Central America and South America

[edit]

The partial eclipse was seen in all Central American countries, from Belize to Panama, all the Greater Antilles (Cuba, Dominican Republic, Haiti, Puerto Rico, and Jamaica), and northern South America (Colombia).[24]

[edit]

Space.com identified the ten largest cities where totality was visible. In population order, they were:[9]

  1. Montreal, Quebec
  2. San Antonio, Texas
  3. Dallas, Texas
  4. Austin, Texas
  5. Fort Worth, Texas
  6. Indianapolis, Indiana
  7. Durango, Durango
  8. Hamilton, Ontario
  9. Torreón, Coahuila
  10. Mazatlán, Sinaloa

Astronomy magazine provided a list of 20 recommended viewing sites, based on factors such as proximity to the center line, population size, ease of access, and so on. They were ordered from west to east:[39]

Visibility in other continents

[edit]

Europe

[edit]

A partial eclipse passed over Svalbard (Norway), Iceland, Ireland, western parts of the United Kingdom, north-western parts of Spain and Portugal, the Azores, and the Canary Islands.[40] Cloud cover prevented views of it from most of the British Isles,[41][42] although it was seen in Western Scotland.[43] Unusually, this eclipse extended below the horizon, where the greatest phase was observed at mid-nautical twilight in Galicia (Spain) and the beginning of astronomical twilight in Nouvelle-Aquitaine (France).[44] The extension of the eclipse path within the twilight zone created what was likely the best observation window for the 12P/Pons–Brooks comet located closely to Jupiter.[45]

Oceania

[edit]

The partial eclipse was seen in Hawaii, eastern Kiribati (the eastern Phoenix Islands and the whole Line Islands), Tokelau, American Samoa except for its extreme western part, the Cook Islands, French Polynesia, and the Pitcairn Islands. Although all located east of the 180th meridian, the local time of the eclipse in Kiribati and Tokelau was Tuesday, April 9, 2024, because either UTC+13 or UTC+14 is observed in these areas.[46][47][48]

Total eclipse timing

[edit]
Solar Eclipse of April 8, 2024
(Local Times)
Country or territory City or place Start of partial eclipse Start of total eclipse Maximum eclipse End of total eclipse End of partial eclipse Duration of totality (min:s) Duration of eclipse (hr:min) Maximum magnitude
Mexico Mazatlán 09:51:20 11:07:24 11:09:33 11:11:43 12:32:09 4:19 2:41 1.0217
Mexico Durango 10:55:11 12:12:06 12:14:00 12:15:54 13:36:42 3:48 2:42 1.0136
US Austin 12:17:10 13:36:08 13:37:01 13:37:55 14:58:09 1:47 2:41 1.0027
US Waco 12:20:27 13:38:00 13:40:07 13:42:13 15:00:44 4:13 2:40 1.02
US Fort Worth 12:22:26 13:40:26 13:41:43 13:43:00 15:01:50 2:34 2:39 1.0056
US Arlington 12:22:44 13:40:23 13:42:03 13:43:44 15:02:10 3:21 2:39 1.0103
US Irving 12:23:09 13:40:47 13:42:28 13:44:09 15:02:31 3:22 2:39 1.0104
US Dallas 12:23:15 13:40:42 13:42:38 13:44:34 15:02:43 3:52 2:39 1.0152
US Garland 12:23:44 13:41:10 13:43:06 13:45:02 15:03:07 3:52 2:39 1.0152
US Plano 12:23:50 13:41:24 13:43:10 13:44:56 15:03:08 3:32 2:39 1.0118
US Little Rock 12:33:29 13:51:36 13:52:50 13:54:04 15:11:35 2:28 2:38 1.0054
US Sikeston 12:41:06 13:58:02 13:59:48 14:01:34 15:17:08 3:32 2:36 1.0129
US Evansville 12:45:52 14:02:38 14:04:09 14:05:40 15:20:33 3:02 2:35 1.0092
US Indianapolis 13:50:31 15:06:03 15:07:58 15:09:53 16:23:14 3:50 2:33 1.019
US Dayton 13:53:29 15:09:28 15:10:50 15:12:12 16:25:37 2:44 2:32 1.0075
US Riverside 13:53:37 15:09:37 15:10:57 15:12:17 16:25:42 2:40 2:32 1.0072
US Toledo 13:56:53 15:12:23 15:13:16 15:14:10 16:27:01 1:47 2:30 1.0032
US Akron 13:59:07 15:14:13 15:15:38 15:17:02 16:29:07 2:49 2:30 1.0085
US Cleveland 13:59:20 15:13:45 15:15:40 15:17:35 16:29:01 3:50 2:30 1.0225
US Erie 14:02:23 15:16:22 15:18:14 15:20:05 16:30:52 3:43 2:28 1.0202
Canada Hamilton 14:03:52 15:18:12 15:19:07 15:20:02 16:31:12 1:50 2:27 1.0036
Canada Burlington 14:04:02 15:18:30 15:19:14 15:19:58 16:31:16 1:28 2:27 1.0024
Canada Oakville 14:04:20 15:19:18 15:19:28 15:19:39 16:31:24 0:21 2:27 1.0004
US Buffalo 14:04:54 15:18:20 15:20:13 15:22:06 16:32:11 3:46 2:27 1.0254
US Rochester 14:06:58 15:20:08 15:21:58 15:23:47 16:33:27 3:39 2:26 1.0213
Canada Kingston 14:09:30 15:22:15 15:23:47 15:25:19 16:34:30 3:04 2:25 1.0121
Canada Montreal 14:14:26 15:26:49 15:27:33 15:28:17 16:36:53 1:28 2:22 1.0026
Canada Longueuil 14:14:34 15:26:52 15:27:39 15:28:26 16:36:58 1:34 2:22 1.003
US Montpelier 14:14:57 15:27:38 15:28:27 15:29:15 16:37:55 1:37 2:23 1.0031
Canada Sherbrooke 14:16:36 15:27:42 15:29:25 15:31:08 16:38:17 3:26 2:22 1.0203
References:[1]

Characteristics

[edit]

Magnitude

[edit]
TOP: Solar prominences as seen from Third Connecticut Lake, New Hampshire - MIDDLE: Solar activity 08 April 2024 imaged by NASA Solar Dynamics Observatory AIA 304 telescope. Features seen here on the edge of the solar disk correspond to the prominences seen by earthbound observers during the eclipse totality. The large, bright, tent-shaped prominence reported by eclipse gazers appears here as detailed filaments around the 4:30 o'clock position. - BOTTOM: National Solar Observatory GONG telescope movie of solar activity in H-Alpha for the day of the April 8, 2024 eclipse, showing how prominences hardly changed during the eclipse.

The magnitude of an eclipse, or the ratio of the angular diameter of the Moon to the angular diameter of the Sun, must be one or greater for a total eclipse to occur. The Moon was near perigee (the closest point in its orbit to Earth) during this eclipse. Occurring only about 24 hours after perigee (on April 7, 2024, at 18:50 UTC), the Moon's apparent diameter was larger.[49] The Sun had an angular diameter of 31'56" at the moment of greatest eclipse. As the magnitude of this eclipse at that time was 1.0566, the angular diameter of the Moon was 1.0566 times that of the Sun, or 33'44". This gave the eclipse a wider path of totality and more maximum time in totality (4 min 28 s) compared to the total eclipse in 2017 (2 min 40 s), which had a magnitude of 1.0306.

Solar prominences

[edit]

The eclipse occurred around the solar maximum, a period of greatest solar activity in the Sun's 11-year solar cycle, and it was anticipated that solar prominences would be visible during totality.[50] Many observers reported seeing solar prominences during the event.[51][52][53] Most plainly visible to the naked eye was a very bright red point of light near the lowest portion of the Sun's disk, which on telescopic views and photographs showed as a tent-shaped angular structure. The red and pink hues were the result of hydrogen and helium plasma being thrown up in broad arcs but never leaving the sun's atmosphere.[54][55] Telescopic photographs revealed the western limb having several smaller, irregular shapes, of which one large, ragged shape appeared disconnected from the Sun's surface on one side. Several smaller prominences were also visible on the eastern limb, though because of the eclipse's relatively high magnitude, prominences on both limbs could not be viewed at the same time. These shapes correlate in detail with the NASA Solar Dynamics Observatory solar telescope images taken in space at the same as the earthbound eclipse, and with images from the ground-based National Solar Observatory GONG telescope in Cerro Tololo, Chile.

Shadow bands

[edit]

The shadow bands phenomenon was observed and documented in some locations with clear skies. Attempts to observe and record shadow bands on the ground were disappointed in many areas of totality by the phenomenon not appearing in the event, perhaps having been washed out by the diffuse illumination of cloudy skies in various locations.[56][57]

Eclipse path intersections

[edit]

The path of the April 8, 2024, eclipse crossed the path of the previous American total solar eclipse of August 21, 2017, with the intersection of the two paths being in southern Illinois, in Makanda, just south of Carbondale.[58]

The path of the April 8 eclipse also crossed the path of the annular solar eclipse that occurred less than 6 months prior, on October 14, 2023, intersecting in the vicinity of San Antonio, Texas.[59]

Impact

[edit]

Economy and tourism

[edit]
Crowd of eclipse viewers during totality over Kingston, Ontario

It was projected before the eclipse that there could be a $6 billion boost to the US economy due to the eclipse. The Mayor of Rochester, New York, Malik Evans, told reporters that the city was expected to bring in between $10–12 million to the city's economy from the Friday before the eclipse to the day of it.[60][61] However, the day was cloudy. On April 12 New York Governor Kathy Hochul announced record breaking tourism numbers between April 6 and 9, which was a 45% increase compared to 2023, with nearly one million visitors to New York State parks and over 5.5 million toll transactions recorded.[62]

One company that tracks Airbnb data likened the economic impact of the event to having Taylor Swift's concerts taking place simultaneously in every city along the eclipse's path. In the United States, the prices of motels and hotels near the path of totality increased up to 100 percent on April 7 and April 8. Montreal saw a 20% surge in hotel occupancy for April 7 and April 8.[63][64][65]

The eclipse caused a drop in solar power generation, with Texas experiencing a decrease from 12,000 MW to just over 3,000 MW at 2 p.m. Wind power generation also decreased by about 50% that day. However, there were no disruptions in power distribution as supply exceeded demand.[66]

At Yankee Stadium, the Yankees gave away eclipse T-shirts to the first 15,000 fans at the game that day. The eclipse had pushed the start time back by four hours.[67]

Traffic

[edit]
Post-eclipse traffic in Wyoming after the solar eclipse of August 21, 2017. Traffic planners learned from the 2017 eclipse, and efforts based on this experience might have helped ease congestion in some areas while others experienced severe and prolonged traffic jams.[68]

Highways in the area of totality saw significant increases in traffic, with departing tourists caught in traffic jams lasting up to eight hours.[69] Many of those trying to drive down Interstate 93 in New Hampshire, for example, found themselves in jams lasting until at least 2 a.m. the following morning, resulting in numerous cars breaking down.[70] Drivers and passengers spent four to six hours to pass through Franconia Notch where Interstate 93 is reduced to a single lane in each direction. Major highways in the state remained crowded through rush hour the following morning and into the afternoon.[71] A similar effect was seen during the following morning's rush hour in northbound Interstate 65 in Indianapolis.[72] In Vermont there were an estimated 60,000 additional cars and 248 inbound aircraft over the span of the eclipse weekend, with about 160,000 visitors coming into the state per Secretary of Transportation Joe Flynn.[73] Drivers in southern Illinois leaving the region of totality to the north toward St. Louis, Missouri faced more than 80 miles of stop-and-go heavy congestion.[74] Unlike other regions, traffic was lighter in Texas than the state's Department of Transportation had anticipated.[68]

Animal behavior

[edit]

Zookeepers, naturalists, university researchers, and citizen scientists positioned themselves to observe animal behavior during the eclipse, some with the goal of comparing results with observations made during the 1932 and 2017 total solar eclipses, and others opening new avenues of animal behavioral research. Wildlife and zoo animals were observed along the path of totality and in areas that saw only a partial eclipse. NASA worked with ARISA Lab, LLC, to recruit thousands of citizen scientists to help record sounds and observations of animal behavior during the eclipse. As of 16 April 2024, a total of 3,372 written observations had been submitted by citizen scientists, and 770 recording devices had been registered with the project to provide sound and ultrasound recordings of wildlife and other ambient sounds before, during, and after the eclipse in a standardized way.[75]

Wildlife

[edit]
Wildlife sometimes act in unusual ways during a total solar eclipse. This Cooper's hawk took flight during totality of the April 8, 2024, total solar eclipse at Kinkaid Lake in the Shawnee National Forest in Illinois.

Changes in wild animal behavior were recorded during the eclipse, especially among birds. These changes were similar to those observed during the 2017 eclipse, but more pronounced.[76] Weather radar was adapted to monitor the activity of flying animals, and birds were observed to decrease their daytime activities.[76] Radar imaging demonstrated "noticeable decreases in typical daytime biological activities such as the movements of hawks and other soaring and insect-eating birds."[76] Owls began hooting, and vultures and other birds began to roost.[77] A team from Purdue University, observing a variety of ecosystems on wild-lands maintained by the university near Butlerville, Indiana, recorded the songs of 20 different species of birds going quiet, leaving only the songs of the robin and the tufted titmouse during the eclipse.[78] Birding students at the University of Vermont observed species at Lake Champlain during the eclipse that had not been observed there before, including Bohemian waxwings, red-tailed hawks, and pileated woodpeckers.[79]

Haikubox community science data from hundreds of locations found that at locations experiencing more than 99 percent obscurity, and in the absence of human vocalizations, birds generally stopped vocalizing, but that there was variability between locations and individual species responses.[80]

Insects and frogs in the wild were also observed making their nighttime sounds.[77] Cicadas in Arizona stopped singing when the Sun was 50% blocked during their partial eclipse.[81] Spring peepers, a type of nocturnal frog, were heard intermittently by the Purdue team in rural Indiana while the eclipse was partial, but they abruptly filled the soundscape at the moment of totality.[78] Wild cricket frogs were observed in Fort Worth, Texas, behaving similarly.[82]

Zoo animals

[edit]

At the Columbus Zoo and Aquarium, ostriches returned to their barn and began their evening rituals, such as preening and grooming each other. When the sunlight returned, the ostriches left their barn and resumed their daytime activities.[83] A group of elephants at the zoo gathered together and began thumping their trunks on the ground.[83] At the Fort Worth Zoo in Texas, flamingos bunched together, vocalized, and began marching together, which is a bonding behavior.[81] A troop of gorillas at that zoo also gathered at the door to their indoor enclosure, where they were normally fed each evening, and appeared to act confused and frustrated, as if having missed their evening meal.[84][81] The Fort Worth Botanic Garden (FWBG) placed hundreds of butterflies in their conservatory March 1, allowed them to acclimate, and observed them during the eclipse. The butterflies "didn't roost but instead ceased flying and remained very still."[82] Goats at the FWBC were observed resting or sleeping during the eclipse.[82] Giraffes at the Dallas Zoo also began to gallop, a behavior witnessed there and at many other zoos during the 2017 eclipse.[84] Two aldabra tortoises at the same zoo were observed to rear on their hind legs and attack the door to their indoor enclosure, damaging the door's frame.[84] Lions at the Buffalo Zoo started roaring just before totality.[85]

Not all zoo animals reacted to the eclipse, nor did researchers expect them to. During the 2017 eclipse, researchers at the Riverbanks Zoo in South Carolina observed behavior changes in about 75% of species.[81][86] Adam Hartstone-Rose, a biology professor at North Carolina State University, hypothesized that the captive animals that did react may have been responding to the emotions of human zoo visitors.[84] Zoologists and volunteers at Parc Safari, a zoo in Hemmingford, Quebec, noted very little change in the animals they observed there, including giraffes, lions, hyenas, wolves, lynx, llamas, alpacas, and dromedaries. Hyenas vocalized during the eclipse, but there were other coinciding events that might have contributed to that behavior.[87] The zoo's director of zoology, Aurélien Berthelot, did not expect much activity from their mammals. For example, lions sleep up to eighteen hours per day. Some roared during the eclipse while others slept. Analyses of their observations are continuing.[87]

Responses

[edit]
NASA's Earth Polychromatic Imaging Camera's satellite image of the solar eclipse over North America[88]

Arkansas Governor Sarah Huckabee Sanders preemptively declared a state of emergency related to the eclipse, citing the expected increase of travel to the state which could result in transportation difficulties, such as in Fort Smith, where the police prepared for traffic congestion as hotels filled up.[89][90] Bell County, Texas Judge David Blackburn preemptively declared a state of emergency in February 2024 due to the projected number of visitors to the area.[91] The region surrounding Niagara Falls, Ontario, also declared a state of emergency; as an existing major tourist destination along the path of totality, it expected an influx of at least one million visitors on April 8.[92]

A lawsuit was filed on April 2 by six inmates of various religions at Woodbourne Correctional Facility in New York against the state, stating that the decision to lock down the prison during the eclipse conflicted with their religious beliefs. The solar eclipse is important in various religions.[93] The state settled the lawsuit by allowing the six inmates to view the eclipse.[94]

[edit]

Total

[edit]

Total with scenery

[edit]

Partial

[edit]

Composites

[edit]

Projections

[edit]

Eclipse details

[edit]

Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the Moon's penumbra or umbra attains the specific parameter, and the second table describes various other parameters pertaining to this eclipse.[95]

April 8, 2024 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 2024 April 8 at 15:43:23.3 UTC
First Umbral External Contact 2024 April 8 at 16:40:00.7 UTC
First Central Line 2024 April 8 at 16:41:09.4 UTC
First Umbral Internal Contact 2024 April 8 at 16:42:18.1 UTC
First Penumbral Internal Contact 2024 April 8 at 17:46:09.2 UTC
Greatest Eclipse 2024 April 8 at 18:18:29.4 UTC
Greatest Duration 2024 April 8 at 18:20:44.2 UTC
Ecliptic Conjunction 2024 April 8 at 18:22:00.8 UTC
Equatorial Conjunction 2024 April 8 at 18:37:18.9 UTC
Last Penumbral Internal Contact 2024 April 8 at 18:50:23.9 UTC
Last Umbral Internal Contact 2024 April 8 at 19:54:30.4 UTC
Last Central Line 2024 April 8 at 19:55:38.1 UTC
Last Umbral External Contact 2024 April 8 at 19:56:45.7 UTC
Last Penumbral External Contact 2024 April 8 at 20:53:30.4 UTC
April 8, 2024 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 1.05656
Eclipse Obscuration 1.11631
Gamma 0.34314
Sun Right Ascension 01h11m36.9s
Sun Declination +07°35'29.4"
Sun Semi-Diameter 15'58.2"
Sun Equatorial Horizontal Parallax 08.8"
Moon Right Ascension 01h10m57.5s
Moon Declination +07°53'55.5"
Moon Semi-Diameter 16'36.3"
Moon Equatorial Horizontal Parallax 1°00'56.6"
ΔT 71.5 s

Eclipse season

[edit]
See also: Eclipse cycle

This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.

Eclipse season of March–April 2024
March 25
Descending node (full moon)
 April 8
Ascending node (new moon)
Penumbral lunar eclipse
Lunar Saros 113		 Total solar eclipse
Solar Saros 139
[edit]

Eclipses in 2024

[edit]

Metonic

[edit]

Tzolkinex

[edit]

Half-Saros

[edit]

Tritos

[edit]

Solar Saros 139

[edit]

Inex

[edit]

Triad

[edit]

Solar eclipses of 2022–2025

[edit]
Solar eclipse series sets from 2022 to 2025
Ascending node   Descending node
Saros Map Gamma Saros Map Gamma
119

Partial in CTIO, Chile 		April 30, 2022

Partial 		−1.19008 124

Partial from Saratov, Russia 		October 25, 2022

Partial 		1.07014
129

Partial in Magetan, Indonesia 		April 20, 2023

Hybrid 		−0.39515 134

Annularity in Hobbs, NM, USA 		October 14, 2023

Annular 		0.37534
139

Totality in Dallas, TX, USA 		April 8, 2024

Total 		0.34314 144

Annularity in Santa Cruz Province, Argentina 		October 2, 2024

Annular 		−0.35087
149

Partial from Halifax, Canada 		March 29, 2025

Partial 		1.04053 154 September 21, 2025

Partial 		−1.06509

Saros 139

[edit]

This eclipse is a part of Saros series 139, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on May 17, 1501. It contains hybrid eclipses from August 11, 1627 through December 9, 1825 and total eclipses from December 21, 1843 through March 26, 2601. There are no annular eclipses in this set. The series ends at member 71 as a partial eclipse on July 3, 2763. Its eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.

The longest duration of totality will be produced by member 61 at 7 minutes, 29.22 seconds on July 16, 2186. This date is the longest solar eclipse computed between 4000 BC and AD 6000.[96] All eclipses in this series occur at the Moon’s ascending node of orbit.[97]

Series members 18–39 occur between 1801 and 2200:
18 19 20

November 29, 1807
December 9, 1825
December 21, 1843
21 22 23

December 31, 1861
January 11, 1880
January 22, 1898
24 25 26

February 3, 1916
February 14, 1934
February 25, 1952
27 28 29

March 7, 1970
March 18, 1988
March 29, 2006
30 31 32

April 8, 2024
April 20, 2042
April 30, 2060
33 34 35

May 11, 2078
May 22, 2096
June 3, 2114
36 37 38

June 13, 2132
June 25, 2150
July 5, 2168
39

July 16, 2186

Metonic series

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The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's ascending node.

21 eclipse events between June 21, 1982 and June 21, 2058
June 21 April 8–9 January 26 November 13–14 September 1–2
117 119 121 123 125

June 21, 1982
April 9, 1986
January 26, 1990
November 13, 1993
September 2, 1997
127 129 131 133 135

June 21, 2001
April 8, 2005
January 26, 2009
November 13, 2012
September 1, 2016
137 139 141 143 145

June 21, 2020
April 8, 2024
January 26, 2028
November 14, 2031
September 2, 2035
147 149 151 153 155

June 21, 2039
April 9, 2043
January 26, 2047
November 14, 2050
September 2, 2054
157

June 21, 2058

Tritos series

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This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200

December 21, 1805
(Saros 119)
November 19, 1816
(Saros 120)
October 20, 1827
(Saros 121)
September 18, 1838
(Saros 122)
August 18, 1849
(Saros 123)

July 18, 1860
(Saros 124)
June 18, 1871
(Saros 125)
May 17, 1882
(Saros 126)
April 16, 1893
(Saros 127)
March 17, 1904
(Saros 128)

February 14, 1915
(Saros 129)
January 14, 1926
(Saros 130)
December 13, 1936
(Saros 131)
November 12, 1947
(Saros 132)
October 12, 1958
(Saros 133)

September 11, 1969
(Saros 134)
August 10, 1980
(Saros 135)
July 11, 1991
(Saros 136)
June 10, 2002
(Saros 137)
May 10, 2013
(Saros 138)

April 8, 2024
(Saros 139)
March 9, 2035
(Saros 140)
February 5, 2046
(Saros 141)
January 5, 2057
(Saros 142)
December 6, 2067
(Saros 143)

November 4, 2078
(Saros 144)
October 4, 2089
(Saros 145)
September 4, 2100
(Saros 146)
August 4, 2111
(Saros 147)
July 4, 2122
(Saros 148)

June 3, 2133
(Saros 149)
May 3, 2144
(Saros 150)
April 2, 2155
(Saros 151)
March 2, 2166
(Saros 152)
January 29, 2177
(Saros 153)

December 29, 2187
(Saros 154)
November 28, 2198
(Saros 155)

Inex series

[edit]

This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200

August 27, 1821
(Saros 132)
August 7, 1850
(Saros 133)
July 19, 1879
(Saros 134)

June 28, 1908
(Saros 135)
June 8, 1937
(Saros 136)
May 20, 1966
(Saros 137)

April 29, 1995
(Saros 138)
April 8, 2024
(Saros 139)
March 20, 2053
(Saros 140)

February 27, 2082
(Saros 141)
February 8, 2111
(Saros 142)
January 20, 2140
(Saros 143)

December 29, 2168
(Saros 144)
December 9, 2197
(Saros 145)

See also

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Notes

[edit]

References

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Solar eclipse of April 8, 2024

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The Solar eclipse of April 8, 2024, was a total solar eclipse in which the Moon passed between Earth and the Sun, completely blocking the Sun's disk for observers along a narrow path of totality stretching across North America. This event began over the Pacific Ocean near Mexico's coast at approximately 11:07 a.m. PDT and ended off the coast of Newfoundland at 5:16 p.m. NDT, with the path of totality passing through 15 U.S. states, six Mexican states, and parts of six Canadian provinces. Totality lasted up to 4 minutes and 28 seconds at its maximum near Torreón, Mexico, allowing safe direct viewing of the Sun's corona without protective eyewear during that brief period. The eclipse's path crossed major population centers, including cities like Dallas, Texas; Little Rock, Arkansas; Indianapolis, Indiana; Cleveland, Ohio; and Montreal, Quebec, making it accessible to an estimated 31.6 million people living within the zone of totality and hundreds of millions more who viewed a partial eclipse from surrounding areas. Partial phases were visible across all 48 contiguous U.S. states, most of Mexico and Canada, and parts of Central America and Europe, drawing unprecedented public interest with millions traveling to viewing sites despite weather challenges in some regions. The event prompted widespread preparations, including traffic management and public safety measures, as it was the first total solar eclipse to cross the U.S. since 2017. Scientifically, the eclipse provided a prime opportunity to study the Sun's outer atmosphere, known as the corona, which is normally obscured by the Sun's bright surface. NASA-led efforts included launching three sounding rockets from Virginia's to measure ionospheric changes caused by the sudden drop in sunlight, as well as high-altitude aircraft flights capturing detailed images and spectra of the corona. Ground-based observations, such as kite-borne spectrometers and arrays, investigated origins and atmospheric responses, involving over 80 institutions and student-led launches across the continent. These studies highlighted the eclipse's role in advancing and , while also noting temporary effects on , such as birds quieting and becoming active during totality.

Path and Visibility

Shadow Path

The total solar eclipse of April 8, 2024, began with over the off 's Pacific coast near in the state of at 16:38 UTC. The path then swept northeastward through central , traversing six states: , , , , , and . Upon entering the near , the shadow continued across 15 states, from in the southwest to in the northeast, covering a diverse range of terrain including plains, rivers, and urban centers. The trajectory proceeded into Canada near Niagara Falls in southern Ontario, passing through Quebec, New Brunswick, Prince Edward Island, Nova Scotia, and Newfoundland and Labrador before exiting into the Atlantic Ocean off the eastern tip of Newfoundland at approximately 19:55 UTC. The entire path of the umbral shadow spanned approximately 10,000 miles (16,000 km), one of the longer totality paths in recent decades due to the geometry of the Moon's orbit relative to . The greatest eclipse, defined as the moment when the axis of the Moon's shadow passed closest to Earth's center, occurred at 18:18 UTC over the state of , , where the Sun reached an altitude of about 70 degrees. At this point, near the town of in , the duration of totality achieved its maximum of 4 minutes 28 seconds, providing observers with an extended view of the corona and . The width of the path varied along its course but reached up to 115 miles (185 km) at its broadest, allowing a narrow corridor—roughly 0.5% of Earth's surface—for the full total eclipse experience.

North American Visibility

The total solar eclipse of April 8, 2024, began its path of totality in at 16:38 UTC along the in the state of , with the umbral shadow exiting the country around 17:22 UTC after crossing six states: , , , , , and . Totality durations in ranged from about 4 minutes near the point of greatest eclipse in to shorter intervals closer to the edges of the path, with partial phases visible across the remaining Mexican states and extending into parts of . In the United States, the path of totality traversed 15 states, entering from in southern and progressing northeastward through , , (including a brief clip of the southeastern corner), , , , , , (a small northern portion), , New York, , , and before crossing into . Approximately 31.6 million people resided within the portion of the path of totality, where durations varied from over 4 minutes in parts of and to about 1 minute 46 seconds in , and 2 minutes 34 seconds in , . Partial eclipse phases were observable across the entire , with the greatest obscurations exceeding 90% in regions outside the narrow central path. The eclipse's umbra then entered around 18:20 UTC in , sweeping through six provinces—, , , , , and —before concluding at 19:55 UTC off the Atlantic coast near Newfoundland. Totality durations in reached up to 2 minutes 36 seconds near the northern limit in , with examples including 2 minutes 4 seconds at ; partial phases were visible throughout the rest of the country, though with minimal obscuration in the far north and west. Overall, the partial eclipse was visible to approximately 652 million people across North America, marking the first total solar eclipse in the contiguous United States since August 21, 2017, and the first in Canada since February 26, 1979. The 2024 path intersected the 2017 total eclipse track in southern Illinois near Carbondale, creating a rare "eclipse crossroads," and passed near the October 14, 2023, annular eclipse path in southern Texas.

Global Visibility

The partial phases of the solar eclipse of April 8, 2024, extended beyond across , offering low-obscuration views in several distant regions worldwide. In , the eclipse was visible starting around 18:00 UTC, with maximum obscurations reaching up to 44% in western (e.g., ), approximately 26% in (magnitude 0.260), 11% in parts of the such as , and about 9.5% in northwestern (e.g., A Seara). These views occurred near sunset, limiting observation time to less than an hour in most locations. In , partial visibility was confined to the northwest, including where obscurations reached up to 18%, and extended to parts of with lower coverage. The eclipse was not visible farther east or south on the continent. In northern , such as and , and in Central American areas outside the totality path, observers saw brief partial phases with obscurations typically under 2% (e.g., 1.6% in ). Visibility in and was minimal and fleeting, limited to brief partial phases in eastern and near local midnight, as well as some Pacific islands, with obscurations generally below 5%. In eastern , coverage reached up to 10% in some areas. The eclipse was invisible across most of , all of , and the broader , where the total phase remained exclusive to .

Eclipse Characteristics

Timing and Duration

The total solar eclipse of April 8, 2024, unfolded over approximately five hours and thirteen minutes from its initial partial phase to conclusion. The partial eclipse commenced at 15:42:07 UTC over the , marking the first external contact of the Moon's penumbra with the Sun. As the Moon's umbral shadow reached landfall, the total phase began at 16:38:44 UTC near , , initiating the brief period of complete solar obscuration along the centerline. The moment of greatest eclipse occurred at 18:18:29 UTC near , , where the Moon's shadow axis passed closest to Earth's center, achieving 100% solar obscuration at that point. Totality concluded at 19:58:26 UTC over the Atlantic Ocean off Newfoundland, as the umbra exited Earth's surface. The event fully ended with the partial eclipse terminating at 20:55:03 UTC farther into the Atlantic, representing the last penumbral contact. Along the 115-mile-wide , the duration of the total phase varied due to the geometry of the Moon's shadow and Earth's curvature, ranging from 2 minutes 34 seconds in southern to a maximum of 4 minutes 28 seconds near Torreón, . The eclipse's magnitude, exceeding 1.05, contributed to these extended durations compared to shorter total eclipses. The shadow traversed the path at an average speed of about 1,600 miles per hour, accelerating slightly toward higher latitudes.

Magnitude and Geometry

The solar eclipse of April 8, 2024, exhibited an eclipse magnitude of 1.0566 at greatest eclipse, signifying that the Moon's apparent exceeded the Sun's by approximately 5.66%. This ratio enabled complete obscuration of the Sun along , with the Moon's disk appearing 5.5% larger than its average due to its proximity to Earth at a of 363,394 km during the event—nearer than the mean of 384,400 km and occurring just one day after perigee. The apparent semi-diameter of the Sun measured 15'58.2", corresponding to a full of about 31'56", while the Moon's semi-diameter was 16'36.3", yielding a full of roughly 33'13". These dimensions reflect the orbital at the time of greatest , when the Moon's shadow axis passed closest to Earth's center. The formed part of Solar Saros 139, specifically the 30th event in a series comprising 71 s that recur every 18 years and 11 days. Geometrically, the eclipse's gamma value was 0.3431, quantifying the minimum distance of the shadow axis from Earth's center in units of Earth's equatorial radius (approximately 6,378 km). This positive gamma indicates the umbral shadow cone offset slightly northward relative to Earth's , passing south of the planet's center and resulting in a path of totality confined to northern mid-latitudes. Unlike some eclipses with transitioning zones, this event lacked hybrid characteristics, remaining purely total throughout its umbral phase due to the Moon's sufficient apparent size and the shadow's consistent contact with Earth's surface.

Totality Phenomena

During the total phase of the April 8, 2024, , observers along witnessed a range of striking atmospheric and , as the completely obscured the Sun's disk, allowing the faint outer atmosphere to become visible. The solar corona appeared as a dynamic halo of white, streamer-like structures extending from the Sun, its intricate patterns shaped by the and enhanced by the Sun's activity near the maximum of Solar Cycle 25. Prominences, which are dense loops of plasma suspended in the Sun's , were prominently visible as reddish protrusions along the solar limb, glowing against the dark sky due to the eclipse's timing close to when such features are more frequent and pronounced. These structures, part of the , appeared as vibrant, looping arcs, with observations from NASA's WB-57 capturing them in multiple wavelengths, highlighting their scale and motion. , fleeting bright spots of sunlight filtering through the Moon's mountainous valleys, shimmered along the lunar edge just before and after totality, creating a beaded outline that transitioned rapidly into full darkness. As totality approached, wavy patterns known as danced across the ground, manifesting as alternating light and dark stripes caused by the of the diminishing sunlight through turbulent layers of Earth's atmosphere. These elusive bands, observed in locations like eastern and during targeted studies, moved swiftly parallel to the Sun's position, lasting only seconds to minutes. The onset of totality brought a sudden plunge into twilight-like darkness, with the horizon glowing in a 360-degree sunset effect, accompanied by a noticeable drop of up to 10°F (5.6°C) in many areas, such as 5 to 11 degrees in the central U.S. region. This cooling, driven by the temporary loss of solar heating, contributed to an eerie stillness, though the extent varied with local weather conditions. The ingress and egress of totality were marked by the diamond ring effect, where a single brilliant point of —resembling a set in a ring of coronal light—flashed briefly as the last or first ray pierced a lunar , without any annular phase due to the eclipse's providing full totality. This spectacle, captured in photographs from sites across , underscored the precise alignment that enabled unobstructed views of the corona throughout the event. The eclipse's magnitude of approximately 1.056 ensured complete solar obscuration, facilitating these vivid displays.

Viewing and Impacts

The path of totality for the April 8, 2024, solar eclipse crossed , the , and , offering prime viewing opportunities in urban centers and scenic locales along the narrow corridor. In , in provided a duration of totality of approximately 4 minutes 10 seconds, near the maximum of 4 minutes 28 seconds along the path, making it a highly recommended city for observers due to its central position in the path and accessibility via major highways. Further south in , natural sites such as the Mapimí Biosphere Reserve and Parque Natural Mexiquillo were favored for their open landscapes and low , allowing clear views amid desert and mountainous terrain. In the United States, several major cities lay within the path, with Dallas, Texas—home to approximately 1.3 million residents—experiencing 3 minutes 52 seconds of totality and full coverage. Indianapolis, Indiana, offered 3 minutes 50 seconds of totality, drawing crowds to its urban parks and riverfront areas for organized viewing. , saw 3 minutes 32 seconds of totality, with vantage points along the falls providing dramatic backdrops shared across the U.S.- border. In , Little Rock hosted eclipse-specific events, including public gatherings at the University of Arkansas at Little Rock and citywide watch parties lasting through the 2 minutes 28 seconds of totality. Beyond cities, the around Kerrville emerged as a top scenic recommendation for its rolling hills and river valleys, while the Finger Lakes region in New York, including areas near Rochester, was praised for lakeside clearings and minimal obstructions. Canada's portion of the path featured , —with a population of about 1.7 million—as a key urban hub, where 1 minute 28 seconds of totality were visible from Mount Royal Park and downtown rooftops. , recorded 2 minutes 14 seconds of totality in a remote setting ideal for unobstructed skies. , adjacent to the Canadian border and with around 278,000 residents, also achieved full totality, serving as a gateway for cross-border viewers. For scenic options in , Cape Breton in was suggested for peripheral viewing near the path's end, though primarily for its coastal highlands rather than central totality.

Economic and Tourism Effects

The total of April 8, 2024, generated an estimated $6 billion economic boost to the through heightened , retail spending, and transportation revenues along . In specific locales such as , officials projected an influx yielding $10-12 million in local economic activity from visitor expenditures on lodging, food, and events, though post-event assessments indicated fewer arrivals than anticipated, tempering the full realization of these gains. Hotel rates in key cities like surged by over 390% compared to typical periods, with average nightly costs climbing to around $500 or more for standard rooms, reflecting the intense demand for accommodations in the totality zone. In , where the eclipse began its North American traverse, tourism authorities anticipated substantial visitor draws to sites along the path. Broader projections suggested significant revenue from hospitality and related services, though exact post-event figures indicate varied impacts across regions. experienced a parallel tourism surge, particularly around , where roughly 1 million travelers were expected, leading to a near-doubling of in the week surrounding the eclipse. Local data indicated hotel expenditures rose by 191% and sales increased by 148% compared to prior periods, with an overall economic impact estimated at around $379 million CAD from visitor-related activities. Post-event analyses confirmed a record audience of approximately 50 million viewers across who directly observed the eclipse, driving surges in flight and hotel bookings that exceeded pre-event forecasts in many areas. However, inclement weather in parts of the path prompted some event cancellations and minor booking adjustments, though the overall influx provided a net positive for transportation and hospitality sectors. The eclipse's legacy includes sustained benefits for local economies, with small businesses reporting prolonged gains from eclipse-themed merchandise sales and increased regional promotion, fostering long-term tourism interest in affected communities. Post-event reports as of 2024 highlighted boosts in areas like , with Syracuse seeing a 28% increase in spending at hotels and restaurants.

Transportation Disruptions

The anticipated surge in tourism for the April 8, 2024, total solar eclipse led to significant transportation challenges across , particularly in road and air networks. In , the reported major traffic delays on and other routes leading to viewing areas, with officials warning of congestion lasting several hours before and after the event due to an influx of over a million visitors. Similarly, in , post-eclipse backups formed miles-long stretches of bumper-to-bumper traffic on Interstate 75 near Perrysburg, as travelers departed viewing sites en masse, exacerbating delays on major highways. Air travel faced heightened demand and operational constraints along the eclipse path. The issued notices of higher-than-normal traffic volumes at airports within 50 nautical miles of the path from April 7 to 10, 2024, including potential airborne holding, reroutes, and departure delays for operations. Airports such as Dallas-Fort Worth International handled additional flights, including special eclipse-viewing routes operated by airlines like Delta, reaching near-capacity levels amid the rush of passengers. To manage these strains, states of emergency were declared in at least four U.S. states—, , , and New York—to facilitate resource allocation for control, emergency services, and infrastructure support. In , a statewide declaration addressed expected overload and supply issues, while 's covered the entire state from March 26 to April 9 to handle visitor-related emergencies. considered similar measures in areas like Riverside for congestion mitigation. Following the eclipse, rural areas experienced fuel shortages as demand outpaced supply chains disrupted by heavy travel. In Texas's Bell County, officials had warned of potential gasoline scarcity due to the population doubling to around 800,000, and post-event reports confirmed strained fuel availability in remote viewing regions. responded by modifying schedules on routes like the to accommodate eclipse viewers in areas such as , contributing to elevated ridership on affected lines. At international borders, crossings near saw increased volumes as visitors from both sides sought optimal viewing spots. U.S. Customs and Border Protection anticipated higher traffic at New York land ports, advising delays and recommending advance planning via their Border Wait Time app.

Biological and Environmental Effects

Animal Behavior

During the total of April 8, 2024, observations at zoos along revealed varied reactions among captive animals, primarily triggered by the sudden onset of darkness during totality. Diurnal animals generally quieted down or initiated nighttime routines, such as retreating to indoor enclosures, while nocturnal species showed increased activity; apparent anxiety was the second-most common behavioral response documented in prior eclipse studies and echoed in 2024 observations. At the in , huddled together near their keeper at the back of their exhibit during totality, displaying a protective grouping without proceeding to their usual bedtime door. Giraffes at the same zoo clustered as far from visitors as possible, exhibiting heightened vigilance but no overt distress. vocalized unusually and huddled near their nesting areas, appearing anxious in the dim light. Aldabra tortoises rushed toward their barn entrance, mimicking evening routines. Similar patterns emerged at the , also in , where an laid an egg shortly before totality, and flamingos huddled together while birds initially grew louder before falling silent. Giraffes and zebras ran around their enclosures in response to the darkening sky, and both gorillas and elephants moved toward their night doors as if preparing for bedtime. At the Toledo Zoo in , giraffes ran inside their enclosure during peak darkness before peeking out and returning once light resumed; young gorillas clung to their mothers, otters jumped from water to pace on a , and a stood on hind legs, appearing curious. Observations at the in noted minimal disruptions overall, with staff monitoring but reporting no significant behavioral shifts among the animals. Domestic pets, including dogs and cats, displayed brief signs of confusion or anxiety during the , often lasting under five minutes and resolving as light returned. Common reactions included whining, barking, pacing, panting, or hiding, particularly in animals prone to storm-related anxiety, as the sudden darkness mimicked an evening onset. Veterinarians recommended keeping pets indoors to minimize stress from both the environmental change and external crowds.

Wildlife Observations

During the total solar eclipse of April 8, 2024, wildlife along from through the to exhibited notable shifts in behavior, primarily triggered by the sudden darkness and associated environmental changes. Observations from national wildlife refuges and projects documented a widespread transition to crepuscular or nocturnal patterns among diurnal , influenced by a temperature drop of up to 10°F in areas of full obscuration. Birds demonstrated a continental-scale response, ceasing and flying to roost as if night had fallen, with data from 143 stations across the U.S. and revealing suppressed aerial activity approaching totality. A study analyzing over 10,000 crowdsourced behavioral observations via the SolarBird app, combined with localized acoustic monitoring of nearly 100,000 vocalizations from 52 , found that 29 out of 52 showed significant changes in vocal , with many diurnal reducing or halting calls during totality while others, like American robins, increased vocalizations, resuming with a dawn-like chorus afterward. Amphibian activity showed variability, with frog choruses increasing in intensity prior to totality—likely in response to dimming light mimicking —before falling silent during the peak darkness. Reports from forest sites in the path, such as near , noted nocturnal species like frogs resuming calls during totality, but overall diurnal vocalizations quieted abruptly. Insects largely suspended daytime routines, with halting flight and remaining motionless on , while foraging and buzzing ceased entirely at totality, resuming gradually post-event. Fireflies, typically nocturnal, began flashing shortly after totality ended, signaling a perceived shift to evening conditions. These patterns, observed at multiple sites including refuges managed by the U.S. Fish and Wildlife Service, aligned with the temperature decline prompting crepuscular-like responses. Mammals avoided mass panic but adopted subdued behaviors, with deer bedding down prematurely and squirrels retreating to hides or nests as light faded. This shift to more nocturnal patterns, without widespread distress, was consistent across observations in natural habitats along the eclipse path, further linked to the rapid cooling and shadow passage.

Responses and Observations

Public and Media Reactions

Millions of people across gathered to witness the total of April 8, 2024, with hundreds of thousands converging on , , one of the largest cities in the path of totality. Watch parties and festivals drew large crowds, including 7,000 attendees at the Perot Museum of Nature and Science and thousands more at Klyde Warren Park, where cheers erupted as totality arrived. 's official broadcast, "2024 Total Solar Eclipse: Through the Eyes of NASA," streamed live views and reactions from multiple locations, amassing over 11 million YouTube views. In New York, a filed by six inmates at challenged the state's planned prison lockdown during the eclipse, arguing it violated their religious freedoms to observe . The case, which included an atheist plaintiff seeking to view it as a celebration of shared humanity, was settled on April 5, allowing the men supervised access to the eclipse using approved glasses. Widespread efforts to distribute solar eclipse glasses ensured safe viewing, with organizations like Astronomers Without Borders collecting and redistributing used pairs for global reuse. Media coverage was extensive, with major networks providing live streams that captured the event's progression from through the and into . ABC News' "Eclipse Across America" special, in partnership with , aired on multiple platforms starting at 2 p.m. ET, while and offered similar nationwide broadcasts reaching tens of millions. On , the #Eclipse2024 trended heavily, used over 100,000 times with a reach of nearly 2 billion users on April 8 alone, as people shared photos, videos, and personal reactions. Approximately 32 million people resided in , with millions more traveling to experience it firsthand, leading to post-event celebrations marked by communal awe. In , —the first major city to see totality—thousands cheered from beaches and promenades, while similar joyous reactions echoed in Canadian sites like . Observers frequently described the event as life-changing, with one Dallas viewer noting it brought tears of profound emotion during the brief darkness. Cultural responses included Indigenous perspectives emphasizing reverence and caution. Among the , traditions called for staying indoors during the eclipse, avoiding food and drink to engage in quiet reflection and prayer, viewing it as a time of renewal rather than spectacle. In Mexico's region, home to the Tarahumara people, the event aligned with ancestral stories of celestial harmony, though specific 2024 observances focused on respectful indoor gatherings.

Scientific Studies

During the total solar eclipse of April 8, 2024, scientists conducted extensive ionospheric studies to monitor disruptions in radio signals caused by sudden changes in the Earth's upper atmosphere. Researchers using Global Navigation Satellite System (GNSS) data observed significant depletions in total electron content (TEC), reaching up to 65% along the path of totality, with a notable time delay between the eclipse's progression and ionospheric response. High-frequency (HF) radar observations and modeling revealed variations in ionospheric plasma density, confirming disruptions that could affect radio propagation. Very low frequency (VLF) and extremely low frequency (ELF) remote sensing from multiple ground stations further documented lower ionosphere perturbations, providing data on electromagnetic wave propagation during the event. These findings, analyzed using data from networks like MIT Haystack Observatory's GPS receivers, highlighted the eclipse's role in temporarily altering ionospheric conductivity and current patterns. Solar observations during the eclipse focused on imaging prominences and analyzing corona structure from ground-based telescopes and aircraft. Ground telescopes captured glowing loops of plasma known as solar prominences, visible as bright features against the darkened solar disk. The corona exhibited pronounced asymmetry, attributed to the Sun's active magnetic field during solar maximum, with spiky extensions observed in real-time broadcasts and stitched image composites. NASA's WB-57 high-altitude aircraft conducted upgraded coronagraphic observations, yielding high-resolution data on coronal features. Preliminary analyses from these efforts, including polarized images from the Citizen CATE project, revealed dynamic plasma structures and helped refine models of solar atmospheric behavior. Scientific monitoring of animal behavior, detailed further in the Biological and Environmental Effects section, involved coordinated efforts at zoos and sites, confirming low levels of stress primarily due to sudden changes and routine disruptions. Ornithological studies using acoustic monitoring showed birds halting diurnal activities during totality and some species increasing vocalizations up to 6-fold immediately after, as levels suggested dawn. Citizen science initiatives played a key role in data collection, including adaptations of the Globe at Night program to measure sky brightness and levels before and after totality. Participants contributed to NASA's missions, such as the Eclipse Megamovie project, which gathered public videos of solar plasma jets and coronal plumes from along the path. The Eclipse Challenge engaged volunteers in observations to study atmospheric responses, while funded projects like Eclipse Soundscapes recorded multisensory data on environmental changes. These efforts amassed thousands of observations, enhancing datasets for research. Post-event analyses resulted in numerous peer-reviewed papers published between 2024 and 2025, detailing ionospheric dynamics and behavioral responses in animals. For instance, a October 2025 study in Science analyzed nearly 100,000 bird vocalizations, finding that more than half of 52 altered their rhythms, with 19 increasing rates post-totality to produce a dawn chorus triggered by the eclipse's light disruption. Ionospheric research papers emphasized the eclipse's utility as a for validating models.

Astronomical Context

Eclipse Calculations

The prediction of the solar eclipse path relies on Besselian elements, a set of mathematical parameters derived from to model the Moon's shadow trajectory across . These elements, computed using ephemerides such as VSOP87 for the Sun and ELP2000-85 for the , enable precise determination of the umbral path limits and central line. For the April 8, 2024, total solar eclipse, the gamma value—representing the minimum distance of the Moon's shadow axis from 's center in Earth radii—was 0.3431, indicating a moderately inclined path relative to the . The maximum duration of totality at greatest eclipse was 4 minutes 28.1 seconds (268.1 s), occurring along the central path where the umbra fully engulfed the Sun. Data from the Five Millennium Canon of Solar Eclipses, a comprehensive catalog spanning -1999 to +3000, provides geocentric coordinates for key umbral contact times. The first umbral contact, marking the initial intersection of the Moon's dark shadow with Earth's surface, occurred at 07°36.2'S and 152°54.5'W at 16:40 UTC. Greatest eclipse, the point of maximum shadow coverage, was at 25°17.2'N, 104°08.3'W at 18:17:18.3 UTC. The last umbral contact ended at 48°03.7'N, 030°32.4'W at 19:54 UTC. These coordinates, adjusted for Earth's oblateness and lunar , form the basis for detailed path tables used in mapping. NASA's eclipse predictions, developed at the (GSFC), integrate these elements into software models for global simulations. The models account for dynamical time corrections ( = 70.6 s) and generate interactive tools, such as overlays, to delineate the path of totality up to 198 km wide across . For specific viewing sites, horizon profiles—diagrams of solar altitude versus —were produced to assess obstruction risks from terrain, aiding observers in , the , and . These outputs included calculated timings for partial phases, beginning at first contact (P1) around 15:42 UTC and ending at fourth contact (P4) around 20:52 UTC, with umbral contacts from 16:38 UTC to 19:56 UTC, varying by location. Post-event analysis confirmed the high fidelity of these predictions, with the umbral path limits verified to within 100-200 meters (<1 km) accuracy based on ground observations of totality edges, such as sightings in and . Post-event observations, including sightings, confirmed the predictions' accuracy to within tens of meters along the path edges. This precision stems from refined lunar limb profiles and solar diameter measurements incorporated into the models, minimizing discrepancies from pre-eclipse estimates that had suggested potential offsets up to 610 meters.

Eclipse Season

The solar eclipse of April 8, 2024, formed part of the March–April 2024 , a roughly 35-day period during which the alignment of the Sun, , and near the lunar nodes enabled multiple eclipses. This season paired the total with a preceding penumbral on March 25, 2024, visible primarily across the , , and parts of and . The occurred at the Moon's descending node, with the full Moon positioned in Virgo, while the took place at the ascending node. Eclipse seasons arise twice annually when the Sun's comes within approximately 18.5° of either , creating a window for as the Moon passes through these intersection points roughly every 27.2 days. In this case, the Sun and aligned closely enough to the nodes during late and early , with the Sun advancing from about 5° Aries at the to 19° Aries at the . The themselves lie on the Aries–Libra axis during this period, influencing the geometric conditions for visibility and type of . Historically, eclipse seasons can accommodate up to seven eclipses—typically two or three solar and a similar number of lunar—but the 2024 March–April season featured only two, reflecting the variable geometry of the Moon's inclined orbit. The subsequent unfolded in – 2024, continuing the annual pattern separated by about 173 days. These short-term seasonal frameworks contribute to broader repeating patterns in occurrences over longer cycles. The solar eclipse of April 8, 2024, belongs to Saros series 139, which consists of 71 eclipses spanning from May 17, 1501, to July 3, 2763, with a repeat interval of approximately 18 years, 11 days, and 8 hours (6,585.3 days). This event marked the 30th eclipse in the series and the longest total eclipse to date within it, with a central duration of 4 minutes and 28 seconds. The series includes a mix of partial, annular, and total eclipses, occurring at the Moon's ascending node, and progresses such that eclipse paths shift northward over time. In the Metonic cycle, a 19-year periodicity that aligns lunar phases and solar calendar dates, the April 8, 2024, total eclipse follows the hybrid solar eclipse of April 8, 2005, which transitioned from annular to total along its path in the Pacific Ocean and South Pacific islands. This cycle, comprising 235 synodic months (approximately 6,939.6 days), ensures similar eclipse circumstances recur on nearly the same calendar date, though the type and visibility vary due to slight orbital changes. The eclipse is part of the Tritos cycle, a periodicity of 135 synodic months (about 3,986.6 days or 10 years and 11 months), which repeats eclipses at alternating lunar nodes and shifts the path by roughly 120 degrees in longitude. For this event, the Tritos series connects it to prior and subsequent eclipses, with the next total solar eclipse in the cycle occurring on April 20, 2042, visible across Southeast Asia and the northern Pacific. Within the Inex cycle, spanning 358 synodic months (approximately 10,571.95 days or 29 years minus 20 days), the 2024 eclipse links to earlier events in the series, including the total solar eclipse of August 21, 2017, whose path intersected the 2024 path near . This longer cycle accounts for the gradual precession of eclipse paths and nodes, producing similar eclipse types every three Saros periods while adjusting for seasonal timing. The 2024 eclipse forms part of a notable triad of total solar eclipses crossing : the August 21, 2017, event (path from to ), the April 8, 2024, event (path from to ), and the August 12, 2045, event (path from to ), where the later paths intersect the earlier ones, creating multiple overlap points across the continent. This eclipse occurred during a sequence of central solar eclipses from 2022 to 2025, including the partial eclipse on October 25, 2022 ( and ), the hybrid eclipse on April 20, 2023 (), the annular eclipse on October 14, 2023 (), the total eclipse on April 8, 2024 (), the partial eclipse on March 29, 2025 (, , and ), and the annular eclipse on September 21, 2025 (), preceding the next total solar eclipse on August 12, 2026 (Arctic regions and ).

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