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    Re: Line of Position Fix
    From: Bruce J. Pennino
    Date: 2012 Oct 18, 20:34 -0400
    
    Hello:
     
    I'm a little ahead of you on the learning curve, but I understand your situation. I first tried to find sites where I could get at least two day light sights 30 D ZN  apart, with a good or reasonably good day time horizon.  Even if I had to use the dip short table.  It took a while for me to really understand "swinging the sextant". It is really a rotating and  swinging motion. Not hard , just takes practice. I've found that sight even with altitudes as low as 15 D can give good results. I almost always take three or five sights and determine the increment between them. Sometimes I plot them. Usually one or two sights are clearly better than others.  If I get two good consecutive sights a minute or so apart I average them.
     
      Day time moon shots are excellent for practice, using upper or lower limb and sometimes you can get sun sights and moon sights at the same time. I struggle with twilight sights to the point I've made a mirror artificial horizon which I'm getting better at.  Go to the U.S.  Naval Observatory web site and look at data services. I really love this site because you submit your location and time and it will give you the visible celestial bodies, their ZN and altitudes. Then you know which ones are available,  and where to look.  Rotating star charts are also very helpful.  They cost  $10  or so.  Some star are very easy to spot after a while, but the horizon at night is my real problem. Everyone says the morning horizon is easier. I'm going to try that in a week or so before the clocks change. At night certain stars are visible early, northern cross and others mentioned.
     
    Good luck
     
    Bruce

     
     
     
     
     
     
     
     
     
     
     
     
     
    ----- Original Message -----
    Sent: Thursday, October 18, 2012 3:21 PM
    Subject: [NavList] Line of Position Fix

    Could somebody help me with my problem . I am learning on my own at present from books on celestial navigation.I need to get a fix with two lines of position but not sure which celestial body other than the sun and the best times of the day to achieve the fix.


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