Erathosthenes
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YouTubeThe Story Grid
Erathosthenes
How did an ancient Greek scholar measure the size of the Earth over 2,200 years ago—without satellites, airplanes, or modern technology? In this video, we explore the remarkable story of Eratosthenes, the brilliant librarian, mathematician, and astronomer who calculated the Earth's circumference using only shadows, geometry, and careful ...
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