6th-century Indian astronomers

Aryabhata (, ) or Aryabhata I (476–550 CE) was the first of the major mathematician-astronomers from the classical age of Indian mathematics and Indian astronomy. His works include the Āryabhaṭīya (which mentions that in 3600 Kali Yuga, 499 CE, he was 23 years old) and the Arya-siddhanta.

Varāhamihira ( 20/21 March 505 – 587), also called Varāha or Mihira, was an ancient Indian mathematician, astrologer-astronomer who lived in or around Ujjain in present-day Madhya Pradesh, India.