390 B.C. The Heliocentric theory went through many astronomers but made an entry through many scholars by Galileo Galilei. Pythagoreans (the cult of Pythagoras) and mostly Philolaus (a Pythagorean) were thought to have made some sort of infrastructure. The first person to propose the idea of Heliocentrism was Aristarchus of Samos and a cult grew called the followers of Aristarchus. Indian philosopher Aryabhata, the man that discovered that pi was irrational, had some theory of Heliocentrism as well. Galileo Galilei is the most famous for his work for Heliocentrism.