Indian astronomers left behind their evidence of contribution in the earliest textual mention, which is given in the religious literature of India. Ancient India's contributions in the field of astronomy are well known and well documented. The earliest references to astronomy are found in the Rig Veda, which are dated 2000 BC. During next 2500 years, by 500 AD, ancient Indian astronomy has emerged as an important part of Indian studies and its affect is also seen in several treatises of that period. In some instances, astronomical principles were borrowed to explain matters, pertaining to astrology, like casting of a horoscope. Apart from this linkage of astronomy with astrology in ancient India, science of astronomy continued to develop independently, and culminated into original findings such as:
* The calculation of occurrences of eclipses
* Determination of Earth's circumference
* Theorizing about the theory of gravitation
* Determining that sun was a star and determination of number of planets under our solar system
Great Indian Astronomers:
1. Aryabhata
2. Varahamihira
