Aristarchus

Aristarchus of Samos (310-230 BC) was a Greek astronomer who realized that the sun was larger than the earth. He was reported by Archimedes to have taught that the earth orbited a motionless sun,^[1] and that the sun is at the center of the universe.

1. ↑ The New American Desk Encyclopedia, Penguin Group, 1989

• Encyclopedia Britannica entry