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Eratosthenes

Eratosthenes

Eratosthenes of Cyrene was a Greek mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria. He invented the discipline of geography, including the terminology used today. He is best known for being the first person to calculate the circumference of the Earth, which he did by applying a measuring system using stades, or the length of stadia during that time period. His calculation was remarkably accurate. He was also the first to calculate the tilt of the Earth's axis. Additionally, he may have accurately calculated the distance from the Earth to the Sun and invented the leap day. He created the ... more on Wikipedia

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List of Famous Geographers List of Famous Librarians Famous People From Libya List of Famous Astronomers Famous Male Mathematicians Famous Male Astronomers Famous People Who Died in Alexandria Famous Male Librarians