Hindu astrology

Hindu astrology, also called Indian astrology, jyotisha (Sanskrit: ज्योतिष, romanized: jyotiṣa; from jyót 'light, heavenly body') and, more recently, Vedic astrology, is the traditional Hindu system of astrology. It is one of the six auxiliary disciplines in Hinduism that is connected with the study of the Vedas.

The Vedanga Jyotisha is one of the earliest texts about astronomy within the Vedas. Some scholars believe that the horoscopic astrology practiced in the Indian subcontinent came from Hellenistic influences. However, this is a point of intense debate, and other scholars believe that Jyotisha developed independently, although it may have interacted with Greek astrology.

The scientific consensus is that astrology is a pseudoscience.

Jyotisha, states Monier-Williams, is rooted in the word Jyotish, which means light, such as that of the sun or the moon or a heavenly body. The term Jyotisha includes the study of astronomy, astrology, and the science of timekeeping using the movements of astronomical bodies. It aimed to keep time, maintain calendars, and predict auspicious times for Vedic rituals.

Jyotiṣa is one of the Vedāṅga, the six auxiliary disciplines used to support Vedic rituals. Early jyotiṣa is concerned with the preparation of a calendar to determine dates for sacrificial rituals, with nothing written regarding planets. There are mentions of eclipse-causing "demons" in the Atharvaveda and Chāndogya Upaniṣad, the latter mentioning Rāhu (a shadow entity believed responsible for eclipses and meteors). The Ṛigveda also mentions an eclipse-causing demon, Svarbhānu. However, the specific term graha was not applied to Svarbhānu until the later Mahābhārata and Rāmāyaṇa.

The foundation of Hindu astrology is the notion of bandhu of the Vedas (scriptures), which is the connection between the microcosm and the macrocosm. The practice relies primarily on the sidereal zodiac, which differs from the tropical zodiac used in Western (Hellenistic) astrology in that an ayanāṃśa adjustment is made for the gradual precession of the vernal equinox. Hindu astrology includes several nuanced sub-systems of interpretation and prediction with elements not found in Hellenistic astrology, such as its system of lunar mansions (Nakṣatra). It was only after the transmission of Hellenistic astrology that the order of planets in India was fixed in that of the seven-day week. Hellenistic astrology and astronomy also transmitted the twelve zodiacal signs beginning with Aries and the twelve astrological places beginning with the ascendant. The first evidence of the introduction of Greek astrology to India is the Yavanajātaka which dates to the early centuries CE. The Yavanajātaka (lit. "Sayings of the Greeks") was translated from Greek to Sanskrit by Yavaneśvara during the 2nd century CE, and is considered the first Indian astrological treatise in the Sanskrit language. However the only version that survives is the verse version of Sphujidhvaja which dates to AD 270. The first Indian astronomical text to define the weekday was the Āryabhaṭīya of Āryabhaṭa (born AD 476).

In the 300 years between the first Yavanajataka and the Āryabhaṭīya, Indian astronomers likely focused on Indianizing and Sanskritizing Greek astronomy, according to Michio Yano We no longer have the astronomical texts from these 300 years. The later Pañcasiddhāntikā of Varāhamihira summarizes the five known Indian astronomical schools of the sixth century. Indian astronomy preserved some of the older pre-Ptolemaic elements of Greek astronomy.

The main texts upon which classical Indian astrology is based are early medieval compilations, notably the Bṛhat Parāśara Horāśāstra, and Sārāvalī by Kalyāṇavarma. The Horāshastra is a composite work of 71 chapters, of which the first part (chapters 1–51) dates to the 7th to early 8th centuries and the second part (chapters 52–71) to the late 8th century. The Sārāvalī likewise dates to around 800 CE. N. N. Krishna Rau and V. B. Choudhari published English translations of these texts in 1963 and 1961, respectively.