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Who is Eratosthenes? Life, Biography & Discoveries of Eratosthenes
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Eratosthenes calculated the circumference of Earth by measuring the angle of the shadow cast by the Sun at noon in two different locations and using this information to determine the distance between the two points on Earth’s surface. He first measured the angle of the shadow cast in Alexandria, Egypt, which he found to be around 7.2 degrees. At the same time, he also measured the angle of the shadow cast in Syene (now Aswan), which was found to be virtually nonexistent as the Sun was directly o
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Eratosthenes, a Greek mathematician, was the first to calculate the Earth’s circumference with remarkable accuracy over 2,000 years ago using a simple yet brilliant method. He observed that at noon in Syene (modern-day Aswan, Egypt), the Sun was directly overhead and cast no shadow, while at the same time in Alexandria, a shadow formed at an angle of about 7.2 degrees. Realizing that this angle represented 1/50th of a full circle and assuming the Sun’s rays were parallel and the Earth was spheri
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