Vatasseri Parameshvara Nambudiri (ca.1380–1460) was a major
Indian mathematician and
astronomer of the
Kerala school of astronomy and mathematics founded by
Madhava of Sangamagrama. He was also an
astrologer. Parameshvara was a proponent of
observational astronomy in
medieval India and he himself had made a series of
eclipse observations to verify the accuracy of the computational methods then in use. Based on his eclipse observations, Parameshvara proposed several corrections to the astronomical parameters which had been in use since the times of
Aryabhata. The computational scheme based on the revised set of parameters has come to be known as the
Drgganita system. Parameshvara was also a prolific writer on matters relating to astronomy. At least 25 manuscripts have been identified as being authored by Parameshvara.