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Eratosthenes

 

6:42

Carl Sagan - Cosmos - Eratosthenes

 

2:31

ERATOSTHENES

 

2:02

How Eratosthenes calculated the Earth's circumference

Biography

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Eratosthenes: Biography of a Great Thinker

 

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How did Eratosthenes calculate the circumference of the Earth?

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.
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