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360 degrees x 60 minutes = 21,600 minutes of arc for full circumference = 21,600 nautical miles (one minute of arc at equator = one nautical mile).

21,600 nautical miles = 24,872.7272...statute miles = 40,028.7 kilometres.

For all practical purposes 40, 000 km. = circumf. at equator.

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11y ago

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