April 14, 2024 at 9:26 am
Before His Demise, Carl Sagan Left A Message for Mars’ Pioneers That The Whole World Should Listen To
Sagan was such a pioneer.
Sagan was such a pioneer.
Sagan was an absolute legend!
Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
In this excerpt from episode 1 of Carl Sagan’s ‘Cosmos’, he explains how the Greek scholar, Eratosthenes, knew the Earth was curved over 2,200 years ago
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