How to measure the Earth

"The first known calculation of the Earth’s circumference was made 2300 years ago by a man called Eratosthenes. I remember in school, how impressed I was by how accurately the Earth’s circumference was measured such long time ago. Today we’re going to take a closer look on how his calculation was made."

https://blog.datawrapper.de/earth-circumference-eratosthenes/

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