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    Re: How close without a good Lunar?
    From: Greg Rudzinski
    Date: 2018 Jul 23, 21:51 -0700

    Mark,

    Just figure the time of next sunrise. Should be possible using the Nautical Almanac with knowledge of position at previous sunset , course, and speed. Mark the time at sunrise and adjust the suspect chronometer to match calculated sunrise.  Not perfect but should be within 3 minutes of correct time. The next step would be to do a round of stars with a Moon observation and adjust chronometer time so that the Moon LOP cuts through the star fix. I believe this is the John Letcher method. Now latitude sail to destination rather than heading directly to the destination.

    Greg Rudzinski

       
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