planetarium software based on gravity

From: Laurens Rossi (laurens.rossi***_at_xs4all.nl)
Date: 10/30/04 

Date: 30 Oct 2004 18:07:07 GMT

Hi All!

I have been searching the web for software which calculates the absolute
position of planets and the sun, which is based on the laws of gravity. All
software I found is based on the trigonometrical calculations with the
current postion and speed of the planets. These programs seem to keep the
sun as an absolute reference point and to calculate the planets' orbits.

What I'm interested in, is the motion of the sun itself related to the
position and motion of the planets.

Has anyone seen such software?

It would be great if:
* the output can be a text table with positions of sun and planets
* the software is in perl, c++, java or some other source code so I can
adjust it
* the software is stable over a longer calculation range (so planets do not
shoot out of orbit after a few hunderd years...

Performance is not important...

Or is the output that I need available on the net somewhere?

All information will be appreciated!

Laurens
laurens.rossi***@xs4all.nl (just remove the *** to mail me)

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