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    Re: Revised Nautical Almanac Concise Sight Reduction Tables
    From: Robert Bernecky
    Date: 2015 Feb 16, 04:15 -0800

    Hi Kermit,

    ***Generally speaking, one should be [very] careful when attempting to recover an Azimuth value through only its SINE value, simply because sin (90°+&°) equals sin (90°-&°). ***

     

    Yes, you are correct.  But apparently in a divided triangle, the Z1 and Z2 angles are each less than or equal to 90 degrees. (I make this claim after looking at the table in the NA!).

     

       
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