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    Re: almanac software
    From: Herbert Prinz
    Date: 2002 Mar 8, 17:04 +0000

    But, Cliff, the NOVAS algorithms _are_ the MICAS algorithms!! They have been
    published by Kaplan, Hughes, Seidelmann, Smith and Yallop in The Astronomical
    Journal Vol 97, 1989.
    
    In fact, I used the MICA program on CD to verify the correctnes of my own Pascal
    transscription of the NOVAS Fortran sources. In some cases - not always - I got
    agreement to the last digit.
    
    By the way, an alternative to NOVAS and Meeus that is _much_ faster to implement
    than either of these is to get "Compact Data 2001-2005" from the HMNAO (e.g.
    through Willmann-Bell). The CD rom contains polynomial  and Chebyshev
    coefficients providing accuracy to 0.1' in ASCII. No source code, but the
    accompanying book gives a cooking recipy to write your own almanac program, with
    sight reduction and all. You also get a ready-to-use Windows implementation of
    same that is invaluable for testing your own product. The data is sufficiently
    compact to fit into a pocket calculator (e.g. HP 48).
    
    Limitation: Only 4 planets, and only 59 stars. And in 2006 you will have to
    shell out more money to the British Government for the next set of data.
    
    
    Herbert
    
    Cliff Sojourner wrote:
    
    > Hal, thanks a big bunch.  I will pick up a copy of "Astronomical
    > Algorithms".  MICA was first on my list to get the source code.  looks like
    > I am going to have to use my noodle a little for this project.  don't know
    > how I missed the NOVAS library, but that looks promising too.  again, thanks
    > a big bunch.
    
    
    

       
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