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    Re: Lunar distance accuracy
    From: Alexandre Eremenko
    Date: 2007 Oct 28, 11:22 -0400

    
    Henry,
    
    Thanks a lot for your contribution.
    
    > in terms of Longitude, were in the order of within
    > 15-minutes of arc, as compared with my known positions
    > at the time of observation.
    
    > I appreciate that Alex's interest in Lunars seems to
    > be the accuracy of the angular measurement attainable
    > with the sextant, a matter of routine to me.
    
    So you attribute most of the 15' error
    (which was typical for your observations, as you say)
    to the reduction method, use of 5-digit tables etc.?
    
    > 2) For land
    > observations, consider mounting his sextant on a tilt
    > table or bracket atop a tripod, which allows
    
    This I consider a violation of the rules:-)
    If one chooses this way, then why not to use
    a 20x scope, and a theodolite, or some other
    instrument more accurate than a sextant, after all?
    What is special about the sextant, and what makes
    it different from other astronomical instruments?
    It is hand-held.
    
    My ultimate interest is in the measurement at sea.
    Unfortunately I have no possibility to sail very frequently.
    
    Alex.
    
    
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