More than 2,200 years ago, an ancient Greek scholar calculated the Earth's circumference with a stick and the Sun

More than 2,200 years before satellites, GPS and space missions revealed the Earth's true size, an ancient Greek scholar calculated the planet's circumference using nothing more than a stick, sunlight and basic geometry. Around 240 BCE, Eratosthenes, the chief librarian of the Library of Alexandria, carried out one of history's most brilliant scientific experiments.

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