The librarian who measured the earth
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Article description
Article description
Axel Winkler tells the biography of Eratosthenes, a Greek hero of mathematics - according to Maria Montessori. Eratosthenes discovered through the observation of the Earth's shadow during lunar eclipses that the Earth must be a sphere. But how large was the Earth's circumference? He calculated the Earth's circumference to be 40,000 km. That was remarkably precise.
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