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Carl Sagan talked about Eratosthenes in Cosmos[0] actually which is what I was thinking of. He was also able to make a good estimate of the size of the Earth as
by hotpotamus 5y ago
Carl Sagan talked about Eratosthenes in Cosmos[0] actually which is what I was thinking of. He was also able to make a good estimate of the size of the Earth as well. The video has a good explanation of how it was done.
[0](https://youtu.be/G8cbIWMv0rI https://youtu.be/G8cbIWMv0rI)