Astronomy advanced tremendously during the ancient period. The Romaka Siddhanta is an Indian astronomical treatise. Aryabhatta, an astronomer and mathematician, is known for his book Aryabhatiya. He mentions the Earth’s movement around the Sun and its rotation on its axis.
Varahamihira, also an astronomer and mathematician, had written Brihat Samhita that covers the subjects of planetary movements, eclipses, rainfall, etc. This proves the advanced thinking that Indians had of astronomy in the ancient times.