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    Re: "100 Problems in Celestial Navigation"
    From: Joel Jacobs
    Date: 2004 Apr 4, 19:14 -0400

    Renee,
    
    The method I used was to average the time and Ho readings of three sights,
    and only plot one LOP for each body. Having the right calculator simplifies
    the process. I also made all the plots in the logbook using the previously
    discussed method.
    
    Joel
    
    
    ----- Original Message -----
    From: "Renee Mattie" 
    To: 
    Sent: Sunday, April 04, 2004 4:24 PM
    Subject: Re: "100 Problems in Celestial Navigation"
    
    
    > I want to thank everybody who chimed in on this thread
    > about Leonard Gray's 100 problems, cocked hats, and
    > sight reduction methods.  I have found it edifying.
    > I would be happy to compare my results to those
    > obtained by others.
    >
    > I have a couple of questions:
    > + Is there a copyright issue to posting the text of
    > one or several of these problems?
    >
    > + What about sight averaging?  I have read recommendations
    > to plot the altitudes of three sights taken in rapid
    > succession and use an altitude/time average, or to find
    > a best-fit line of the proper slope.  Here, folks seem
    > to prefer to plot the LOPs from all three sights.  I suppose
    > this gives you some notion of the size of the error in the
    > individual sights.  I find it difficult, when examining the
    > result, to decide where to mark an MPP, which is, I guess,
    > the point.
    >
    > Leonard Gray does not give any notion of how close he feels
    > the student should come to his answer.
    >
    > Renee
    
    
    

       
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