Puthumana Somayaji
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Puthumana Somayaji was a 15th century mathematician from Kerala, India. He was born into the Puthumana Illam, and is believed to have been a contemporary of Vatasseri Namboodiri.
His famous works are Karana Padhhathi which is a comprehensive treatise on Astronomy (1430-31 AD), the same year as Vatasseri Namboodiri's Drigganitham; Nyaaya Rathnam, an 8-chapter Ganitha Grantham; Jaathakaadesa Maargam; Smaartha-Praayaschitham; Venvaarohaashtakam; Panchabodham; Grahanaashtakam; and Grahana Ganitham.