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© Sierra College Astronomy Department

9

Ancient Astronomy Eratosthenes

250,000 stadia roughly translates into 50,000 km, based on our best guess as to the size of a stadium.  The Earth’s actual circumference is about 40,000 km, so Eratosthenes calculation is 25% too big.  But his geometrical method is correct.

Earth’s circumference of 40,000 km gives a diameter of about 13,000 km (~ 8,000 mi).

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