Aristarchus of Samos ( \ / ˌærəˈstɑrkəs \ / ; Ἀρίσταρχος , Aristarkhos ; c. 310 - c. 230 BCE ) was an ancient Greek astronomer and mathematician who presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it ( see Solar system ) .
His is the first known model that put the Sun at the center of the known universe with the Earth revolving around it ( see Solar system ) .