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Eratosthenes of Cyrene

Eratosthenes
Eratosthenes

Eratosthenes of Cyrene (ca 276 - ca 195 BC) was an Ancient Greek polymath.

He is best known for being the first person known to calculate the Earth's circumference. His result 39,690±630 km, which is within about 1% of the true value.

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Last modified:10 January 2026 2.51 p.m.
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