How Ancient Greeks Calculated Earth's Circumference
Over 2,000 years ago, a Greek mathematician named Eratosthenes was able to calculate Earth's circumference. Learn about how he did it and the way you can measure Earth's circumference on your own.
Sources:
1. Cosmos by Carl Sagan
2. https://www.mathsisfun.com/geometry/a...
3. https://www.skymarvels.com/infopages/...
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