How the Ancient Greeks Figured Out the Earth wasn’t Flat (and solved the circumference too)

Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
Taken from an altitude of 18,000 km by an automatic camera aboard Apollo 4
Photo by ESA astronaut Alexander Gerst
Astrophotographer Bartosz Wojczyński created this fascinating timelapse of the Earth’s rotation
I love how elegantly a simple visualization can explain concepts like these
But of course
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A 4K timelapse tour of Earth as seen by astronauts onboard the ISS
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