What fraction of the Earth”s circumference did Eratosthenes find for the distance between Syene and Alexandria?

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What fraction of the Earth”s circumference did Eratosthenes find for the distance between Syene and Alexandria? 1/50 (which he had determined from about a 7 angle of arc) How did he measure the distance between the two cities? He hired a man to pace out the entire distance from Alexandria to Syene. How close was Eratosthenes in his calculation to the correct answer?

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