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    Re: March 22 Lunar Observations
    From: Jared Sherman
    Date: 2002 Mar 24, 12:45 -0500

    George-
     
     On checking for index error, I read that one should not use any targets that 
    are less than three miles distant. I don't remember the source (Blewitt, 
    Bowditch?) only that it was a respected source. Apparently using convenient 
    telegraph poles & such can actually cause error, since there is still 
    significant (parallax?) error when the objects are so close. This presents 
    another problem in that the visible horizon may be only three miles away.
    
    Wouldn't it be better to use one of the other methods such as bringing the two 
    images of the sun together, innner then outer, and checking index error that 
    way?
    
    
    

       
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