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    Navigation algorithms
    From: Kent Crispin
    Date: 1997 Mar 13, 18:25 EST

    wmurdoch{at}XXX.XXX (Bill Murdoch) said:
    >
    [...]
    >
    > If you go to a programmable calculator, it is not too hard to calculate the
    > GHA of the sun, declination of the sun, semidiameter of the sun, and the GHA
    > of Aries with an accuracy (1 standard deviation) of 0.1' over a 200 year
    > period. It takes from 1500 to 2500 keystrokes to program the calculator. You
    > need only do it once. After that all you need do is enter the usual time,
    > position, sextant reading, and corrections data and the programmable
    > calculator will do the rest.
    Speaking of which, and in light of previous comments on the list about
    starting an archive of navigation programs and such, I have translated
    Bill's most excellent TI-82 calculator program into "C".  I checked
    with him, and he doesn't mind if I make it available publically.  It
    can be retrieved at
    ftp://songbird.com/pub/astro.c
    A MSDOS executable that runs in HP Palmtop computers is also there:
    ftp://songbird.com/pub/ASTRO.EXE
    If there is interest I could just send it (the source) to the list --
    it's only about 250 lines long.
    <PRE>
    --
    Kent Crispin                            "No reason to get excited",
    kent{at}XXX.XXX
    PGP fingerprint:   B1 8B 72 ED 55 21 5E 44  61 F4 58 0F 72 10 65 55
    http://songbird.com/kent/pgp_key.html
    </PRE>
    

       
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