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    Re: HO 211 and Calculator Almanacs
    From: Bill Murdoch
    Date: 1999 Sep 08, 7:00 PM

    Still another source of planetary, solar, and lunar data (and a lot more) is
    Montenbruck and Pfleger, Astronomy on the Personal Computer, Springer Verlag,
    1994.  The book contains programs in Pascal which are helpful guides for
    writing in any other language.  The formulas used for the planets are (or
    seem to be) Newcombe's and for the moon are Brown's.  He uses a neat trick
    with with the sine and cosine addition formulas to greatly minimize the
    number of calls to sin or cos which greatly speeds up the calculation of
    planetary pertubation terms.
    Also helpful is the Astronomical Almanac and The Explanatory Supplement to
    the Astronomical Almanac.
    Bill Murdoch

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