Correct Option: D

Aryabhatta explained that the earth rotates on its axis but revolves round the sun. Aryabhatta was the first to explain how the Lunar eclipse and the Solar eclipse happened. Aryabhatta also gave close approximation for Pi. In the Aryabhatiya, he wrote : "Add 4 to 100, multiply by 8, then add 62000 and then divided by 20000. The result is Approximately the circumference of a circle of diameter twenty thousand.