Kelallur Neelakandhan Somayaji
See also : Nilakantha Somayaji
Neelakandhan Somayaji was born to Jathavedan and Arya in Kelallur Mana of Thrikkandiyur, near Tirur, and belonged to the Gaargya Gothram, Aaswalaayana Soothram of Rig vedam. He studied Vedam, Mathematics and the basics of Astronomy from Vatasseri Damodaran Namboodiri (son of the famous Parameswaran Namboodiri).
His most important work is Thanthra Samgraham (a treatise on Mathematics and Astronomy) of eight chapters with 432 verses, written in six days from Meenam 26 of 676 ME to Medam 1 the same year. Two commentaries were written on this work, Yukthi Bhaasha (in Malayalam) by Paarangot Jyeshtadevan Namboodiri and Yukthi Deepika by Sankara Varier.
Another of his important works is a Bhaashyam (commentary) on Aaryabhateeyam. His other works include Jyorthir Meemaamsa, Chandra Chhaayaa Ganitham (calculations relating to moon's shadow), Sidhhantha Darpanam (on the Laws of Astronomy) and its Vyaakhyaa, Golasaaram (Essence of Spherical Astronomy), Grahana Nirnayam, Grahanaashtakam, Graha Pareekshaa Kramam and Sundara Raaja Prasnotharam. His commentary on Aaryabhateeyam shows that his scholastic abilities extend beyond Jyotisham and Vedantam, to the realms of Mimamsa, Vyakaranam and Nyayam.