In this video I discuss the myth that people in the medieval times believed in a flat Earth, and how Eratosthenes, a Greek mathematician calculated an estimate for the circumference of the Earth.
The video is about the experiment he performed, and you get to learn about the mathematics behind his approach as well as the assumptions he took before proceeding.
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Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0