Aryabhata the Elder, was a mathematician and astronomer who was born in India in 476.  He is the
author of Aryabhatiya(499 A.D)  Aryabhatiya is a summary of Hindu mathematics up to 499 A.D.  Some of the topics covered include algebra, arithmetic, astronomy, and plane geometry.  In addition, he included formulas for areas of circles and triangles.  These are correct but the formulas for volumes of a sphere and a pyramid are not correct.  Aryabhata also approximated pi accurately.  His approximation was 3.1416.  Aryabhata also wrote Siddhanta which dealt mainly with astronomy. A crater on the moon is named after Aryabhata.

Author: Filiberto Barajas

References:
1.  Biography in Dictionary of Scientific Biography(New York 1970-1990).
2.  A Ahmad, On the pi of Aryabhata I, Ganota Bharati 3(3-4)(1981), 83-85.