72,980 (rounded)
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An arc-minute is 1/60 of a degree. It is not a measure of length, so you can't convert it to inches.
There is no such thing as one degree of minute.There are 60 minutes of arc in one degree of arc and 60 seconds of arc in one minute of arc
Yes, one minute of arc of latitude along any meridian is about one nautical mile.
One minute of latitude represents 1 nautical mile
60 at the equator, decreasing steadily to zero at the poles. In general: (60) times (the cosine of the latitude).