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Eratosthenes that was the first known scientist to seriosly (excuse my spelling) study and prove.
http://wiki.answers.com/Q/Which_scientist_said_the...
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Pythagoras.
http://wiki.answers.com/Q/Who_first_said_that_the_...
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Based on the shadows that the Earth created on the Moon during an eclipse the early philosopher Aristotle suggested the Earth to be round and mentioned it in his writings. The first
http://answers.ask.com/Society/History/who_discove...
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Believe it not, people once thought the earth to be flat and that a person could actually fall off it they walked to the edge of the earth. However it was the Pythagorean's who were
http://answers.ask.com/Science/Other/who_proved_th...
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