Jyotish - History

History

Further information: Indian astronomy and Hindu chronology

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 fix the date of sacrificial rituals. Nothing is written on planets. There are mentions of eclipse causing "demons" in the Atharvaveda and Chāndogya Upaniṣad, the Chāndogya mentioning Rāhu. In fact the term graha, which is now taken to mean planet, originally meant demon. The Ṛgveda also mentions an eclipse causing demon, Svarbhānu, however the specific term of "graha" becomes applied to Svarbhānu in the later Mahābhārata and Rāmāyaṇa..

It is only after the Greek settlement in Bactria (third century BC) that explicit references to planets are attested in Sanskrit texts. 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. Hellenstic 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 ("Sayings of the Greeks") was translated from Greek to Sanskrit by Yavaneśvara during the 2nd century CE, under the patronage of the Western Satrap Saka king Rudradaman I, and is considered the first Indian astrological treatise in the Sanskrit language. However the only version that survives is the later 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). According to Michio Yano, Indian astronomers must have been occupied with the task of Indianizing and Sanskritizing Greek astronomy during the 300 or so years between the first Yavanajataka and the Āryabhaṭīya. The astronomical texts of these 300 years are lost. The later Pañcasiddhāntikā of Varāhamihira summarizes the five known Indian astronomical schools of the sixth century. It is interesting to note that 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 later 8th century. The Sārāvalī likewise dates to around 800 CE. English translations of these texts were published by N.N. Krishna Rau and V.B. Choudhari in 1963 and 1961, respectively.