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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: "100 Problems in Celestial Navigation"
From: Joel Jacobs
Date: 2004 Apr 4, 19:14 -0400
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