The famous astronomer Brahmagupta (598-670) wrote important works on mathematics and astronomy, including Brahma-sphuta-siddhanta (The opening of the universe) and Khandakhadyaka. He studied solar and lunar eclipses, as well as the motions and positions of the planets. Unlike Aryabhata, Brahmagupta believed that the Earth was stationary, but he, too, calculated the length of the year with remarkable precision.
Brahma Sphuta Siddhanta.pdf
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