This Day in History ClassThis Day in History Class

Eratosthenes calculates the Earth's circumference using a stick - June 19th, 240 BC

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On this day in 240 BC, ancient Greek scholar Eratosthenes estimated the circumference of the Earth.

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This Day in History Class

From the desk of “Stuff You Missed in History Class,” “This Day in History Class” quickly recounts a 
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