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    Re: SNOT at large angles
    From: Alexandre Eremenko
    Date: 2004 Nov 1, 09:51 -0500

    Dear Frank,
    Are there any sextant experts in Chicago,
    to whom I could show my sextant to collimate
    and determine the arc non-uniformity error?
    I just don't want to send it by mail again,
    but Chicago is the place I can easily come to.
    Alex.
    
    
    On Sun, 31 Oct 2004, Frank Reed wrote:
    
    > Alex E wrote:
    > "ERD          0.5       0.3'      0.3'      0.3'      0.3
    > It look like my sextant has some arc distortion at large arcs.
    > I am going to make a table of it using star-to-star distances."
    >
    > There may be other issues, too.
    > Such large angles are difficult to observe
    > for a variety of reasons from shaky hands
    > to telescope collimation. If there
    > *is* arc error, once it's measured,
    > it's easy to correct for, of course.
    >
    > Frank R
    > [ ] Mystic, Connecticut
    > [X] Chicago, Illinois
    
    
    

       
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