Great Post by Scott Locklin on Eudoxus

Eudoxus invented real numbers, orbital mechanics and a form of calculus, 2000 years before Newton. He also discovered the leap year, invented a sundial, described constellations, wrote epicurean philosophy, discovered many theorems in solid geometry, he is alleged to have been a pretty good interior designer; he wrote books of geography and sociology, meteorology, Egyptian theology and was revered as a wise lawgiver in his home town. His productive years were between 26 and 53, when he died. Compare him to the imagined smartest man who ever lived, Einstein, who started research when he was 21, and died at 76. Eudoxus accomplished much more in a shorter period of time. He did it before Alexander the Great; before the invention of the steam engine; before Rome became an empire; before the Great Wall of China was built. Eudoxus lived so long ago, he is at the bare edge of recorded history.