examine the ideas of greek philosophers on the shape and size of the earth during the classical times
Leucippus and Democritus believed that the Earth is flat.
Pythagoras tried to prove that the Earth has the shape of a sphere.
Aristotle, based on observations, came to the conclusion that the earth has a spherical shape.
Eratosthenes believed that the earth is in the shape of a sphere, and was the first to calculate the circumference of the earth.
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