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2:02
YouTube
Business Insider
How Eratosthenes calculated the Earth's circumference
In the mid-20th century we began launching satellites into space that would help us determine the exact circumference of the Earth: 40,030 km. But over 2000 years earlier, a man in Ancient Greece came up with nearly the exact same figure using just a stick and his brain. -------------------------------------------------- Follow BI Video on ...
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