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    Re: Star-star distances for arc error
    From: Frank Reed
    Date: 2009 Jun 25, 21:18 -0700

    Bill, you wrote:
    "I can tell you that no matter what the combination of scopes and sextants,
    our observations agreed within 0.1 to 0.2 minutes of an arc for any star
    pair, and we did find a strange spot on my sextant around the 90d mark that
    was a full minute off."
    
    That sounds like it's consistent with my experience and once again 
    demonstrates that you can indeed use star-star distances to assess arc error. 
    Not to belabor the point, but just to make sure I'm not mis-interpreted, 
    there are other ways, potentially (and probably) somewhat more accurate than 
    star-star distances, but they are not always as convenient --the stars are 
    there any clear night.
    
    -FER
    
    
    
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