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    Size of a nautical mile
    From: Lu Abel
    Date: 2009 Jan 15, 13:35 -0800

    As has been pointed out, the length of a degree of latitude varies from
    pole to equator.
    
    The nautical mile is supposed to equal a degree of latitude.   Today,
    however, it is defined as precisely 1852 meters.
    
    When one multiplies 1852 by 7200 (the number of minutes in 90 degrees),
    one gets 10 000 800 meters as an answer.
    
    My understanding is that the distance from equator to pole is 10 002 000
    meters.   It's a small discrepency, on the order of 0.01%, but I'm
    wondering why it was allowed to stand instead of defining the NM more
    precisely.
    
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