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Re: SUN keps ?

----- Original Message ----- 
From: "laura halliday" <marsgal42@hotmail.com>
> It's entirely possible that IT special-cases these two bodies,
> and uses the appropriate algorithms to calculate their
> positions. The more accuracy you want, the more
> calculation is involved. The full VSOP87 calculation
> involves several hundred terms, but can easily predict
> things like eclipses.

That's what I do - for planets (and the Moon) separate algorithms. Arguably 
simpler than those for satellites. The source (C++) is available if needed.

Simon Brown
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