On this day in 240 BC, ancient Greek scholar Eratosthenes estimated the circumference of the Earth.See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.

On this day in 240 BC, ancient Greek scholar Eratosthenes estimated the circumference of the Earth. See omnystudio.com/listener for privacy information.

On this day in 240 BC, ancient Greek scholar Eratosthenes estimated the circumference of the Earth.See <a href="https://omnystudio.com/listener" rel="noopener noreferrer">omnystudio.com/listener</a> for privacy information.

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

From the desk of “Stuff You Missed in History Class,” “This Day in History Class” quickly recounts a tidbit from today’s events in history.

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

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