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    Re: How Many Chronometers?
    From: Geoffrey Kolbe
    Date: 2009 May 07, 12:40 +0100
    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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