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. Aristotle in the fourth century B.C.E. provided the physical evidence, such as the shadow of the Earth on the moon and the curvature of the Earth known by all sailors approaching land. And by the third century B.C.E., Eratosthenes determined the Earth's shape and circumference using basic geometry. In the second century C.E., Claudius Ptolemy wrote the "Almagest," the mathematical and astronomical treatise on planetary shapes and motions, describing the spherical Earth. This text was well known throughout educated Europe in Columbus' time.
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