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    Re: Hi (WAS: Re: ping)
    From: Hal Mueller
    Date: 2001 Jan 25, 7:52 PM

    At 4:18 PM -0800 1/25/01, Yves Arrouye wrote:
    >So I'm now looking for 1/ good references to
    >algorithms (Jean Meeus?), and 2/ suggestions on what you would like to see
    >in a celestial navigation program that existing programs do not have.
    When I was developing CelestNav and MG229, I used Jean Meeus
    "Astronomical Algorithms" for the planetary ephemeris, the Nautical
    Almanac itself for most of the sight reduction algorithms (with some
    help from the hardcopy HO229), Bowditch for the geodesy formulas, and
    the program MICA (from the US Naval Observatory) for checking
    ephemeris calculations.  Most of those references can be purchased
    from Willman-Bell.  Early versions of CelestNav used the PD code
    NOVAS (also from the USNO) to do the star ephemeris, but most of that
    code is gone now.
    The most-requested feature enhancements from CelestNav customers are
    support for artificial horizons, and sight planning tools (predict
    the azi/elev of visible bodies from your DR position).
    In addition to my own apps (CelestNav and MG229), I'm aware of
    Astronavigation 2, and Pilot Navigator 3.1.  All 4 are available at
    On the Palm side, if you decide to code in C I suggest you get up to
    speed on multisegment applications, as well as learning the launch
    codes and user interface guidelines thoroughly.  There are other
    options besides C now:  AppForge's port of Visual Basic, NSBasic,
    Satellite Forms, CASL, and others I've skipped.  They're all listed
    on www.palmos.com/dev.
    The Palm OS Emulator is an essential tool.  If you are outside of the
    US, sign up right now for the developer program so that you can have
    access to the device ROMs (there's an annoying delay between signup
    and access).  Start your Gremlins testing on POSE right away; don't
    wait until your code is finished.
    Hal Mueller                hal@mobilegeographics.com
    Mobile Geographics LLC     http://www.mobilegeographics.com/
    Seattle, Washington        (206) 297-9575

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