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    Hc Calculations
    From: Myrt Webb
    Date: 2002 Apr 14, 14:05 -0600

    Greetings From Montana(USA)
    I have been "lurking" on this list for a few weeks and while I find the
    discussion interesting most of if is well above my level. Since I would like
    to post a request I thought I might introduce myself.
    I am a retired field artillery officer who has always been interested in
    navigation. Since I used several celestial techniques in the service I
    became interested in celestial navigation a year or so ago and have been
    working at using the Nautical Almanac and my sextant. I use an artificial
    horizon on a photo tripod that seems to work pretty well.
    For my calculations I have an Excel spreadsheet that uses the methods
    described in the Nautical Almanac. I also wrote a  simple C program for my
    TI89 hand calculator based on the methods in the Almanac.
    I recently installed 'Navigator Light' on my computer and while I think it
    is a great program the results(Hc)that I obtain differ significantly from
    both my spreadsheet and my calculator. The spreadsheet and calculator agree
    with 1' for Hc and 1� for Z. The Tecepe program will be 20-40' different. I
    have redone my stuff several times and cannot find the problem.
    I would appreciate if someone, who has a calc spreadsheet or C code, would
    send me the same so I can determine why I am getting the large differences.
    My email is: myrtwebb@centurytel.net
    Myrt Webb

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