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 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
Physics.unplugged. Physics.unplugged · Original audio. 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 ...
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Eratosthenes of Cyrene (c. 276-195 BC) was an ancient Greek polymath who became chief librarian at Alexandria's legendary library. Born in Cyrene (modern Libya), he studied in Athens before being summoned to Alexandria by Ptolemy III. Though critics nicknamed him "Beta" for always placing second in every field, his colleagues called him "Pentathlos" for his well-rounded expertise in mathematics, geography, astronomy, poetry, and music theory. His final years brought blindness, and rather than li
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