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    Re: HO 211 and Calculator Almanacs
    From: Tony S
    Date: 1999 Sep 09, 11:27 PM

    Bill:
    
    What is "this neat trick" that you mention. Is it a matter of grouping
    intermediate results of long streams and then carrying on?
    
    Thanks for the additional references.
    
    Tony
    
    Bill Murdoch wrote:
    >
    > 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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