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    Re: Digital Image CN Exercise #3
    From: Marcel Tschudin
    Date: 2010 Apr 12, 07:45 +0300

    It seems that nothing was wrong, except my expectations. I hoped that
    with the sun at high altitude the observed height would agree better
    with the calculated one. The azimuthal bearing to the east edge of
    Anacapa Island seems to have been correct, but missed the target. The
    line had to be shifted vertically by about 1 minute of arc
    (corresponding to about 4 km) to match the target. This means that the
    location found from the sun's altitude is in error by about the 1'moa.
    I understand now that this is the sort of error to expect from having
    taken the photo with a sextant in-between.
    
    Marcel
    
    
    
    

       
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