How Egyptians knew Earth is not flat

Here is an Aha! moment in the history of science when Eratosthenes proved Earth is not flat. These clips are from the astronomer & master science communicator Carl Sagan's Cosmos.

Wish to watch the video clip? Here it is.

This video animation from business insider also explains the same idea in a simpler manner:


The thumbnail image is taken from Cristian Violatti's article in the Ancient History Encyclopedia

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