Vatasseri Parameshwaran Nambudiri
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Vatasseri Parameshwaran Nambudiri was a 15th century astronomer and mathematician from Kerala, India.
Parameshwaran Nambudiri was born into the Vatasseri Mana (a Nambudiri Brahmin family) on the norther bank of the Nila River (Bharathapuzha) near Aswatha Gramam (near present Tirur of Malappuram district). He was a Rigvedi of the Bhrigu Gothram.
[edit] Contributions
Parameshwaran, as a result of over fifty years of systematic observations and research on movements of celestial bodies, estimated the error factor and established a new method called Drig Sidhham. This method is explained in his famous work Driganitham (1431 AD).
Another of his contribution was a correction to the angle of precision of equinox mentioned by his disciple, Kelalloor Somayaji in his Jyothirmeemaamsa. The 13 ½° suggested by Mujjaalakan was rectified by Parameshwaran to 15°.
Other works include the 3-volume, 302 verse Gola Deepika (1443 AD) explaining the stars and earth in very simple terms, Jaathaka Padhhathy in 41 verses, Soorya Sidhhantha Vivaranam, Grahana Mandanam, Grahanaashtakam, Vyatheepaathaashtaka Vrththi in 500 verses.
He has written superb commentaries such as Sidhhantha Deepika on Govindaswamy's Mahaa Bhaaskareeyam; Karma Deepika or Bhata Deepika on Aarya Bhateeyam; Muhoortha Rathna Vyaakhyaa on Govindaswamy's Muhoortha Rathnam; Leelavathee Vyaakhyaa on the famous mathematical treatise, Leelavathy of Bhaskara II; Laghu Bhaaskareeya Vyaakhyaa on Laghu Bhaaskareeyam of Bhaskara I; Jaathaka Karma Padhhathee Vyaakhyaa on Sreepathy's 8-chapter work on Jyothisham; the one on Laghu Maanasam of Mujjaalakan; Jaathakaadesa Vyaakhyaa; and Prasna-Nashta Panchaasikaavrthy also called Paarameswari based on the work of Prathhuyasass, son of Varaahamihiran.
