Aryabhatta, a mathematician and astronomer, wrote Aryabhatiyam in Sanskrit.
Varahamihira was an Indian philosopher, astronomer, and mathematician. He wrote Brihat Samhita.
Brahmagupta contributed to the world of astronomy and mathematics in ancient India and wrote Brahmasphutsiddhanta.
Bhaskaracharya was an Indian mathematician and astronomer. He wrote Siddhanta Siromani.