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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)

gl

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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