Question

How did aryabhatt calculated circumference of earth?

Answer 1

So I looked. This is a circumferenceof an abstraction, the World Geodetic System, at “nominal seal level.”) ... Eratosthenes calculated thecircumference of the Earth without leaving Egypt. He knew that at local noon on the summer solstice in Syene (modern Aswan, Egypt), the Sun wasdirectly overhead.

Answer 2

This is the correct answer