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Earth's Circumference: Figured Out 2,000 Years Ago

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 - Earatosthenes - came up with nearly the exact same figure using just a stick and his brain. In fact, he was out by just 30 km.


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