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    Re: Loss of accuracy using Sun over Sun with a mercury artificial horizon?
    From: Bob Goethe
    Date: 2016 Jul 18, 18:20 -0700

     16 of the sights were Away which suggests to me a systematic error.  The IE is 0'. One thought I had was that if the IE was 1' off there would be an even towards/away distribution. However I had carefully checked IE using the two limb method.

    I have concluded that I am not bringing the sun down far enough before  reading the sextant.<

    I resonate with this, David.  I found that over a span of dozens of sights, I averaged 1 nm toward in my lines of position.  I eventually decided the issue was with me rather than anything else.  I solved this by adding 1 nm away as a "personal error."

    Bob

       
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