Kamalakara (1616 – 1700) was an Indian astronomer and mathematician, came from a learned family of scholars from Golagrama, a village situated in Maharashtra State near Partha-puri (Pathari) on the northern bank of the river Godāvarī.
Divakara, who was the eldest of the brothers born in 1606, and Ranganatha who was youngest.
[3] Kamalākara's major work, "Siddhāntatattvaviveka", was compiled in Varanasi at about 1658 and has been published by Sudhakar Dwivedi in the Vārāṇasī series.
It deals with the topics of: units of time measurement; mean motions of the planets; true longitudes of the planets; the three problems of diurnal rotation; diameters and distances of the planets; the Earth's shadow; the Moon's crescent; risings and settings; syzygies; lunar eclipses, solar eclipses; planetary transits across the Sun's disk; the patas of the Moon and Sun; the "great problems"; along with a conclusion.
But this ideas was first expressed in Brahmanda Purana and Matsya Purana by sage Veda Vyasa: "uttAnapAda-putro-asau meDhibhooto dhruvo divi | sa hi bhraman bhtaamayate nityam chandraadityau grahaiH saha ||".