Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center of the universe, with the Earth revolving around the Sun once a year and rotating about its axis once a day. He also supported the theory of Anaxagoras that the Sun was just another star. 310 BC – 230 BC; died at about 80. Alive at the same time as Qin Shi Huang, Epicurus, Chanakya, Archimedes, and Euclid. Wiki link