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    Where on earth are lunar distances the same?
    From: Jim Thompson
    Date: 2005 Mar 14, 07:09 -0400

    I understand clearly how a body's altitude is the same anywhere on a circle
    on the surface of the earth around the GP of the body at a given instant of
    time, but I cannot picture the set of places on the surface of the earth
    from where a navigator would find the same lunar distance for a given
    Moon-Body pair at a given instant of time.  Is it one unique point, or a
    line of points?  If the latter, what does it look like? (This is why I get
    beaten at chess so routinely.)
    
    Using Frank's predictor at http://www.clockwk.com/lunars/lunars_pre_v5.html,
    I played around by changing latitude or longitude.  The lunar distances for
    each hour of GMT did not seem to change until longitude changed by several
    degrees (using a start position of 47d 11m N, 63d 07m W).
    
    Jim Thompson
    www.jimthompson.net
    --------------------
    Outgoing email scanned by Norton Antivirus
    
    
    

       
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