The circumference of the earth at the equator is 360 degrees. Each degree of lattitude is 60 minutes. 60 minutes equals 1 nautical mile, 360 X 60 equals 21600 nautical miles.
A nautical mile is 1,852 meters, or 1.852 kilometers, which is longer than a statue or imperical miles The shortest mile is the metric mile at 1500m.
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