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    Re: Using sun compass for calibrating boat compass
    From: Bill B
    Date: 2014 May 07, 15:12 -0400

    Duh. Refraction only raise the object toward the zenith, and therefore
    should should not affect the azimuth. Yes no?
    > When reducing a sight one would traditionally compute the Hc, then the
    > azimuth from the Hc (although the azimuth can be computed directly
    > without the Hc).
    > This is fine for plotting an LOP, but it raised a concern for me. Is the
    > azimuth I obtain for the celestial object tied to its Hc, rather than
    > its observed position with refraction?
    > Perhaps the accuracy of a shadow sun compass (as opposed to a William
    > Burt solar compass )on a light to medium displacement sail craft is such
    > that it is a moot point?
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