Solved: Calculation of earths size in equatorial circumference, Other Subject

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Calculation of earths size in equatorial circumference

Question:

The size of the earth was probably first calculated by Eratosthenes, a Greek living in Egypt, in 250 B.C. shows the elements he used in his calculation. How could he have arrived at a circumference of about 40,000 km, not far off from today's accepted value of 40,077 km, for the equatorial circumference?

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