Aristarchus of Samos

lived from about 310 BC to about 230 BC

Aristarchus was a Greek mathematician and astronomer who is celebrated as the exponent of a Sun-centred universe and for his pioneering attempt to determine the sizes and distances of the Sun and Moon.

Find out more at:
http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Aristarchus.html