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    Re: Sight Reduction Formula Question
    From: FS
    Date: 2005 Jan 7, 08:19 -0800

    Thanks Fred, you are absolutely correct, Turner does
    indeed explain that the short one can yield 180 deg
    ambiguity.  I should have kept reading.
    --- Fred Hebard  wrote:
    > I believe Turner gives the reason for the longer
    > formula and also shows
    > the shorter one, saying the shorter one can be
    > inaccurate in some cases.
    > Fred
    > On Jan 7, 2005, at 10:24 AM, Fried Squash wrote:
    > > In _Celestial for the Cruising Navigator_ by Merle
    > > Turner, the navigational triangle azimuth formula
    > is
    > > given as:
    > >
    > > cos Z = (sin d - (sin L * sin H ))/(cos L * cos H)
    > >
    > > but Dutton's Navigation and Piloting gives the
    > much
    > > simpler:
    > >
    > > sin Z = ( cos d * sin t ) / cos H
    > >
    > > They both seem to work.  But there must be some
    > reason
    > >  that the longer one is better, right? Works in
    > more
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