Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago. pic.twitter.com/kCTeMJwFOI— Physics & Astronomy Zone🔠(@ZonePhysics) December 15, 2019
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Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago. pic.twitter.com/kCTeMJwFOI— Physics & Astronomy Zone🔠(@ZonePhysics) December 15, 2019
