More than 2,200 years ago, an ancient Greek scholar calculated the circumference of the Earth using 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 Earth’s circumference using only a stick, sunlight and basic geometry. Around 240 BC, Eratosthenes, chief librarian of the Library of Alexandria, conducted one of the most brilliant scientific experiments in history. By comparing the … Read more