How Eratos­thenes Measured The Earth's Circumference With A Stick In 240 BCE, At An Astonishing 38,624 Kilometers
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How Eratos­thenes Measured The Earth's Circumference With A Stick In 240 BCE, At An Astonishing 38,624 Kilometers

Though the exact length of a "stadia" is unknown, his measurement is thought to be accurate to within one percent of the actual circumference of the Earth.