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. By…