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.[1] His father was Nrsimha who was born in 1586.[2] Two of Kamalakara's three brothers were also astronomer and mathematicians: Divakara, who was the eldest of the brothers born in 1606, and Ranganatha who was youngest. Kamalākara learnt astronomy from his elder brother Divākara, who compiled five works on astronomy. His family later moved to Vārāṇasī.[3]
Major works
Kamalākara's major work, "Siddhāntatattvaviveka", was compiled in
Varanasi at about 1658 and has been published by
Sudhakar Dwivedi in the Vārāṇasī series. This work consists of 13 chapters in 3,024 verses. 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. His other works include Śeṣavāsanā and Sauravāsanā. Kamalākara was bitterly opposed to
Munishvara, the author of Siddhāntasārvabhauma.
It is wrongly believed by some moderners that Kamalākara discovered the idea that the
pole star we see at present is not exactly at the pole. 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 ||". The meaning of this expression is "Uttanapada's son
Dhruva is fixed like a pole in the Heaven, but it is moving itself and is making all the planets together with Sun and Moon move".
Kamalākara's contribution was to rejuvenate this forgotten idea.
In the third chapter of the Siddhanta-tattva-viveka Kamalakara used the addition and subtraction theorems for the sine and the cosine to give trigonometric formulae for the sines and cosines of double, triple, quadruple and quintuple angles. In particular he gives formulae for sin(A/2) and sin(A/4) in terms of sin(A) and iterative formulae for sin(A/3) and sin(A/5).
Achar, Narahari (2007).
"Kamalākara". In Thomas Hockey; et al. (eds.). The Biographical Encyclopedia of Astronomers. New York: Springer. p. 609.
ISBN978-0-387-31022-0. (
PDF version)