Category: astronomy
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Portfolio: Eratosthenes Measured Earth (Animation)
The Greek astronomer, mathematician and geographer Eratosthenes of Cyrene (276-194 BC) was the first person to accurately measure the circumference of Earth. This animation illustrates his method. Randy Russell developed this animation (using the now-defunct Flash animation software) for a citizen science project as part of his work on the Windows to the Universe web…