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    Re: Sighting errors
    From: Greg Rudzinski
    Date: 2019 Jan 7, 11:29 -0800

    Joel,

    Be sure that you are using the correct limb if not overlapping the Sun image. Try a liquid water horizon as a check to determine if there is a sight reduction error or a problem with the first surface artificial horizon and leveling.

    Greg Rudzinski

    'As a relative newcomer to celestial nav., I've experienced a puzzling problem. Using an artificial horizon, my sights at angles of 20 to 15 deg. (40 to 30 deg. sextant) have been significantly in error (40 min. to a full degree). Readings at greater angles have been relatively accurate. 

       My AH is a first surface miror mounted on a plastic cutting board. The board has three leveling feet and is leveled using a Starrett 98 level. The problem is evident with two different sextants. 

       Can anyone offer suggestions?

       
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