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Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2000 years ago

Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2000 years ago

Video Credits to: u/JesseMukherjee6
< Previous World's smallest cat - Duck it's small. Ever wondered how to determine if the Earth is either flat, or round, and then to calculate its circumference - using only sticks, feet, and brains? Carl Sagan explains how. Next >
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