Question

Which scientiest proved that the earth is not flat?

Answer 1

500 B.C -  Pythagoras  first proposed that the Earth was round  

500 B.C. and 430 B.C. - Anaxagoras determined the true cause of solar and lunar eclipses - and then the shape of the Earth's shadow on the Moon during a lunar eclipse was also used as evidence that the Earth was round

350 BC - Aristotle declared that the Earth was a sphere (based on observations he made about which constellations you could see in the sky as you travelled further and further away from the equator)