A distance equal to one minute of longitude or latitude at the equator (about 1,850 metres).
- We had determined to mark it not only at right angles to our course - that is, from east to west - but by snow beacons at every two geographical miles to the south.
- Since a geographical mile is a measure of the earth's circumference at the Equator, a knowledge of it implies a knowledge of the measurement of the polar radius.
- Because of this difference, a geographical mile along the equatorial circumference would be 6087 ft long but the same mile along the polar circumference would be only 6066 ft in length.
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