The heliocentric heretic way ahead of schedule. Aristarchus of Samos (c. 310–230 BCE) suggested the Earth orbits the sun — and was mostly ignored for the next 1,800 years. He used geometry to estimate the size and distance of the moon and sun, with shocking accuracy for someone using only shadows and chutzpah. Quietly revolutionary, Aristarchus looked up, did the math, and re-centered the universe — just not in the way his peers liked.