Tag Archives: Eratosthenes

June 19, 240 BCE

On June 19, 240 BCE, Greek philosopher and scientist, Eratosthenes, estimated the circumference of the Earth using two sticks and got pretty darned close to its actual value. Today in the world, there are actually people who… Continue reading

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June 19, 240 BCE

On June 19, 240 BCE Eratosthenes estimated the circumference of the Earth using a well in Syene and a stick at Alexandria and some simple geometry. He’d previously noted that on the summer solstice, in a well at Syene, you … Continue reading

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