of the arc from pole to equator (quarter meridian). The accuracy of measuring the circumference has improved since then, but the physical length of each unit of measure has remained close to what it was determined to be at the time, so the Earth's circumference is no longer a round number in metres or nautical miles.

History

Eratosthenes

The measure of Earth's circumference is the most famous among the results obtained by Eratosthenes,

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