Re: HO 211 and Calculator Almanacs
Subject: Re: HO 211 and Calculator Almanacs
From: Bill Murdoch (WSMurdoch@XXX.XXX)
Date: Wed Sep 08 1999 - 20:59:50 EDT
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
