Why is Aryabhata considered to be one of the greatest of astronomers?

Aryabhata is a famous indian mathematician and astronomer, who was born in 476 AD, he studied at the University of nalanda. Later, he become the head of the university.

ARYABHATA

Aryabhata is considered to have changed the course of mathematics and astonomy to a grate wxtent. He was the first to deduce that the Earth is round, and that it rotates on its own axis, creating day and night. He declared that the moon is dark and shines only because of sunlight, and that the eclipses are caused by the shadows cast by the Earth and Moon.

           
 His most famous works are Aryabhatiya, and the arya Siddhanta. Aryabhata was the first in the line of great mathematician-astronomers from the classical age of  Indian mathematics and astonomy. India’s first satellite is named after him.