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    Re: CelNav without sextant
    From: Bill Noyce
    Date: 2004 Nov 2, 15:40 -0500

    As another way to use rising and setting of stars -- how about
    using the compass to identify the azimuth at which some circumpolar
    stars rise and set?  I suspect that could tell you your latitude
    with reasonable accuracy, even without a watch.  Even if you can
    only read the compass to a couple of degrees, I think the
    uncertainty in such a latitude will depend more on the uncertainty
    of refraction at the horizon.  For example, consider a star whose
    path just grazes the northern horizon -- that tells us our latitude
    without being very dependent on the azimuth measurement.
    With a watch, you can get latitude from the length of time a star
    far from the equator is above (or below) the horizon.  Perhaps you
    could also estimate when it's directly in line with the celestial
    pole, allowing you to measure some stars whose rise or set occurs
    during the day.
            -- Bill

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