Answer: Varahmihira
Notes: Varahamihira's major work is the book Panchasiddhantika 575 CE, which provides information on ancient Indian texts now lost. This work is a treatise on mathematical astronomy and summarizes five earlier astronomical texts by five authors: Theory of Surya, Theory of Romka, Theory of Paulisa, Theory of Vashishta and Theory of Pythagoras. It is a collection of Vedic astrology as well as Hellenistic astronomy (consisting of Greek, Egyptian and Roman elements). Varahamihira first stated that the transition of he or the equinox was 50.32 arc seconds per year.
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