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    Re: Size of a nautical mile
    From: Gary LaPook
    Date: 2009 Jan 15, 14:22 -0800

    That is because the nautical mile was not defined that way. The NM was
    defined as one 21,600th of a great circle on a sphere having the same
    area as the earth. Such a sphere gas the radius of 3,437.746 NM (21,600
    / 2 Pi)
    Lu Abel wrote:
    > 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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