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    Re: How Many Chronometers?
    From: Mike Burkes
    Date: 2009 May 7, 17:13 -0700

    Hi folks, yes indeed this method also discussed in "Self Contained
    Celestial Navigation" by John Letcher Chap 17 pgs 96-105. Pretty neat
    Mike Burkes
    On May 7, 4:40�am, Geoffrey Kolbe 
    > List member John Karl, in his book "Celestial Navigation in the GPS Age",
    > has a nice little section on page 73 entitled Time from a Lunar LOP and a
    > Star Fix. The essence of the method is the LOPs from a number of star fixes
    > will cross neatly at a given point on the chart, but that point will in
    > error in longitude due to the error in the chronometer. The longitude error
    > in a lunar LOP will be slightly different due to the faster motion of the
    > moon across the sky. The trick then is to adjust the time so that all LOPs
    > - including the lunar LOP - cross at the same point. The amount of
    > adjustment required gives the error in the chronometer.
    > I had not seen this described before and thought it quite neat.
    > Geoffrey Kolbe
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