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Pythagoras' idea of spherical Earth was validated by Aristotle a couple of centuries later, around 340 B.C. One of Aristotle's strong arguments for a spherical Earth during his time was the traveller's tales of ships disappearing over the horizon and the Pole star shifting to a higher position in the sky as one journeyed north suggested a curved Earth.

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Anaxogaras
-one of the student of Pythagoras
-supported Pythagoras proposal.
- he observed that during a lunar eclipse, the Earth's shadow was reflected on the moon's surface. The shadow reflected was circular

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The Greek philosopher Aristotle (384-322 B.C.) is credited as the first person to try and calculate the size of the Earth by determining its circumference (the length around the equator) He estimated this distance to be 400,000 stades (a stadia is a Greek measurement equaling about 600 feet).

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Erastothenes
-great mathematician who calculated the earth circumference.
- he determine the shape of the earth by putting a vertical stick on the ground.
- he concluded that the Earth's surface is curved

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The earliest documented mention of the concept dates from around the 5th century BC, when it appears in the writings of Greek philosophers. In the 3rd century BC, Hellenistic astronomy established the roughly spherical shape of Earth as a physical fact and calculated the Earth's circumference.