The Reckoning of Time
The Reckoning of Time
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The Reckoning of Time

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The Reckoning of Time

The Reckoning of Time (Latin: De temporum ratione, CPL 2320) is a Medieval Latin treatise written by the Northumbrian monk Bede in 725.

In mid-7th-century Anglo-Saxon England, there was a desire to see the Easter season less closely tied to the Jewish Passover calendar, as well as a desire to have Easter observed on a Sunday.

Continuing a tradition of Christian scholarship exploring the correct date of Easter, a generation later, Bede sought to explain the ecclesiastical reasoning behind the Synod of Whitby's decision in 664 to favour Roman custom over Irish custom.

Bede's resulting treatise provides justification for a precise calculation for Easter. It also explains why time, and the various units of time, are sacred.

The treatise includes an introduction to the traditional ancient and medieval view of the cosmos, including an explanation of how the Earth influenced the changing length of daylight, of how the seasonal motion of the Sun and Moon influenced the changing appearance of the new moon at evening twilight, and a quantitative relation between the changes of the tides at a given place and the daily motion of the Moon.

The Reckoning of Time describes the principal ancient calendars, including those of the Hebrews, the Egyptians, the Romans, the Greeks, and the Anglo-Saxons. The focus of De temporum ratione was calculation of the date of Easter, for which Bede described the method developed by Dionysius Exiguus. De temporum ratione also gave instructions for calculating the date of the Easter full moon, for calculating the motion of the Sun and Moon through the zodiac, and for many other calculations related to the calendar.

Bede based his reasoning for the dates on the Hebrew Bible. The functions of the universe and its purpose are generally referred to a scriptural foundation. According to the introduction by Faith Wallis in the 1999 English translated edition of The Reckoning of Time, Bede aimed to write a Christian work that integrated the astronomical understanding of computing with a theological context of history. The book is also regarded by Bede to be a sequel to his works De natura rerum ("The Nature of Things") and De temporibus ("On Time").

The work is divided into six sections:

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