Hindu astrology, also called Indian astrology, Jyotisha or Jyotishya (from Sanskrit , from “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.
Following a judgment of the Andhra Pradesh High Court in 2001 which favored astrology, some Indian universities now offer advanced degrees in Hindu astrology. A statistical study conducted by Dr. Nagesh Rajopadhye and astrology researcher Prakask Ghatpande found that none of the basic principles of astrology they tested were valid in its predicability. They said it is no better than pure chance, like tossing a coin. 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 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 term graha, which is now taken to mean the planet, originally meant demon. The Ṛigveda also mentions an eclipse-causing demon, Svarbhānu.