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    CelNav without sextant
    From: Alexandre Eremenko
    Date: 2004 Nov 2, 13:00 -0500

    What sort of Cel Nav can you do without sextant?
    (Assuming you have an almanac and chronometer.
    Or your wristwatch and radio to check it).
    
    Apparently yes. I am not speaking of eclipses
    which are rare events. One method was already
    discussed: timing the occultations of stars by
    the dark edge of the moon, a method slightly
    less precise than that of lunar distances because
    the distance is too small, and only available
    for somewhat less than 1/2 of each month,
    when the moon moves with
    its dark edge forwardis:-)
    
    Another method was proposed by Bill in our recent
    off-the-list conversation: timing the rise and
    set of various bodies. Each such timing gives you
    one position line. It is interesting, how precise
    can this method be. (I understand that the
    major obstacle here is refraction).
    
    Alex.
    
    
    

       
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