Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
How the Ancient Greeks Figured Out the Earth wasn't Flat (and solved the circumference too)
Twisted Sifter - 8 Jul 2020 20:22
Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
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