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    Re: Calculators
    From: Tony S
    Date: 1999 Sep 01, 10:23 PM

    Bill:
    
    I'm not sure what your key points are here but I must say that sun almanacs
    are the easiest to program, with stars following close behind. It's the
    "other buggars" that become very difficult in terms of memory and accuracy.
    :-)  Would you agree?
    
    Tony
    
    Bill Murdoch wrote:
    >
    > I have had a good time playing with the Texas Instrument calculators.  They
    > are inexpensive, easy to program, and readily available.  I have TI-67 Galaxy
    > that I bought new for UKL 17.  The February 1994 copy of Practical Boat Owner
    > has an article which contains a sun sight reduction program for that
    > calculator.  I also have a TI-81 and wrote a similar program for it.  That
    > program was published in the March 1996 issue of Cruising World.  I have
    > modified the sun sight program for the TI-82 and TI-83.  If you wish can send
    > you a copy.  The program contains a 0.1', 200 year solar almanac.  Given the
    > time and date, the sight data, and the DR, it returns the azimuth and
    > intercept.
    >
    > I also wrote a much longer nav program for a TI-82 which has almanacs for the
    > sun, moon, four planets and 92 stars.  It has all be bells and whistles -
    > unknown bodies, mercator and spherical sailings, sun rise and sun set, etc.
    > I sold copies for a few years of the typed program and of the program on
    > diskette (the diskette can be loaded on the calculator through a PC).
    >
    > I learned a lot writing the programs.  I had a good time doing it.  The TI
    > calculators use a language much like Basic and can be programed either
    > through their keypads or through a PC connected to the calculator with a
    > TI-Graphlink cable.  The math is tough, but people did it in the 1800s with
    > little more than logarithm tables.
    >
    > Bill Murdoch
    

       
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