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The Earth was first thought to have been speculated as being spherical from the 6th Century BC, with the idea being developed and more widely accepted into the 3rd Century BC.

Pythagoras was around during the 6th century BC, he may have first speculated the Earths spherical shapes, but no one knows for sure. Other Mathematicians and philosophers such as Herodotus, Plato and Aristotle also contributed to the idea following Pythagoras' time.

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