Parameśvara

Parameśvara (1380-1460 CE) was a major Indian mathematician and astronomer of the Kerala school of astronomy and mathematics founded by Mādhava of Saṅgamagrāma. Parameśvara proposed several corrections to the astronomical parameters which had been in use since the times of Āryabhaṭa based on his eclipse observations. The computational scheme based on the revised set of parameters is known as Dṛk system. Dṛggaṇita is the text composed based on this system.

His works are mentioned below.


 * Bhaṭadīpikā – Commentary on Āryabhaṭīya of Āryabhaṭa I
 * Karmadīpikā – Commentary on Mahābhāskarīya of Bhāskara I
 * Paramesvarī – Commentary on Laghubhāskarīya of Bhāskara I
 * Sidhantadīpikā – Commentary on Mahābhāskarīyabhāshya of Govindasvāmi
 * Vivarana – Commentary on Surya Siddhānta and Līlāvatī
 * Dṛggaṇita – Description of the Dṛk system (composed in 1431 CE)
 * Goladīpikā – Spherical geometry and astronomy (composed in 1443 CE)
 * Grahaṇamaṇḍana – Computation of eclipses (Its epoch is 15 July 1411 CE.)
 * Grahaṇavyakhyādīpikā – On the rationale of the theory of eclipses
 * Vākyakaraṇa – Methods for the derivation of several astronomical tables