Parameshvara is known as Vatasseri Parameshvara Nambudiri. He was born in c.1380 is a famous Indian mathematician and the astronomer who studied and worked in the Kerala school of astronomy and mathematics. The school is founded by Madhava of Sangamagrama. Parameshvara was called Vatasseri from his family side, and his family located in Kerala, Alathiyur, and Tirur. He was from the background of Govinda Bhattathari who is the famous astrologer of the Kerala traditions. Vatasseri guided by the teachers Narayana and Rudra, and during the year of 1350 to 2025, he was in the school of astronomy and mathematics of Kerala. He worked from 1444 to 1544 as an astronomical and mathematical teacher of Nilakantha Somayaji.

Parameshvara served for several of Astronomical and mathematical works like Aryabhata and Bhaskar and several others. Almost fifty-five years he had monitored the series of eclipse and computed the positions of the planets. One of the most significant and prominent efforts of Parameshvara is the calculation inverse interpolation of the Sine and the value of mean value. He has also worked for the formula which includes the radius of the circle and expression for the cyclic violators the necessary it is used to give function on an interval which started from the hypothesis to the point of intervals. He made several Manuscripts of works which are available in several regions of the state.

His notable works are Karmadipika which is the “Commentary on Mahabhaskariya of Bhaskara I, Sidhantadipika the Commentary on Mahabhaskariyabhashya of Govindasvāmi, Drgganita the Description of the Dark system which is composed in 1431 CE, Bhatadipika the Commentary on Aryabhaṭiya of Aryabhata I, Paramesvari all about the Commentary on Laghubhaskariya of Bhaskara I, Vivarana topic on the Commentary of Surya Siddhanta and Lilāvati, Goladipika notable about the Spherical geometry and astronomy composed in the year 1443 CE, Grahanavyakhyadipika covers about On the rationale of the theory of eclipses, Grahanamandana helps us in the Computation of eclipses and Its epoch is 15 July 1411 CE, and Ak yak Arana” consists of the Methods for the derivation of several astronomical tables. He also worked on Dugganite it is all about the Computation of Several Astrologers, Astronomers and Almanac works.

This Drigganita is called as Thiru- Ganita Panchagas in the Tamil Language. Initially, it is introduced by Haridatta which is later revised by Parameshvara as Parahita revision system. He also worked for several works of the Ancient inventors as a reviser.

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