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So much of what we say about Columbus is either wholly untrue or greatly exaggerated. Here are a few of the top offenders. 1. Columbus set out to prove the world was round. If he did, he was about 2,000 years too late. Ancient Greek mathematicians had already proven that the Earth was round, not flat. Pythagoras in the sixth century B.C.E. was one of the originators of the idea.
Copernicusâs model handled the basic observations: 1  Like the geocentric model, the earth was believed to be round. 2  The earth rotated, and thus the stars, sun, and planets appeared to move around the earth.  Mercury and Venus were closer to the sun than the earth and so always appeared near the sun.