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    Re: R: Re: R: Solutions to Gray's 100 Problems (Problem 1-1)
    From: Parsa
    Date: 2007 Sep 27, 10:23 -0700

    I need advice on the sextant height corrections.
    
    I also did all the calculations on my Palm TX using CelestNav
    software.
    It gives the option of rounding or not rounding the assumed position.
    When I set it to round, I'm happy to see that it gives an identical Hc
    to mine. The GHA was a bit different between the Palm and the table
    (336 23.6' on the Palm, 336 23.4' from the nautical almanac with v
    correction.). LHA still works out the same though and the final Hc on
    the Palm is +14 52.9', while I had +14 53'.
    
    The difference is in observed height (Ho). Applying all the
    calculations, I had:
    
    Hs=15 15.3'
    -2.5' for 7 feet Dip (I did it using a formula too and it came to
    -2.6')
    -1.2' index correction
    Ha=15 11.6'
    -3.5' for app. altitude
    +0.3' additional correction for Venus on May 13, 1993
    
    Final Ho=15 08.4'
    
    However, my Palm program gave Ho as Ho=15 10.3' resulting in a LOP 2nm
    different than mine.
    
    That 2 minutes off gave a difference of 2nm. Am I splitting hairs, or
    did I do something wrong?
    
    I want to understand the sextant corrections before I move on since I
    have to do them for every problem.
    
    ... I'm still looking to see what happened with the moon. I'll figure
    that one out soon.
    
    
    
    
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