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    Sextant "side error" and star-star sights
    From: Frank Reed CT
    Date: 2004 Dec 5, 15:41 EST
    Sextant users are advised to eliminate "side error". This the little left-right gap that shows up between the direct and reflected image when the sextant is set to zero. Side error is eliminated when the index mirror is made exactly perpendicular to the sextant frame. Myself, I prefer to leave a "side error" gap of a few tenths of a minute of arc. This is helpful with star-star sights since it's easier to see small changes in alignment than it is when the star images are completely superimposed. So is there a risk to this? What harm does "side error" do to standard sextant sights? If I have a gap of 0.5 minutes of arc, for example, what will be the resulting errors?
     
    Frank R
    [ ] Mystic, Connecticut
    [X] Chicago, Illinois
       
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