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## Main Question or Discussion Point

**Three-Body Problem Problem ("Astronomers")**

Hi,

I am having quite a few problems with the three-body problem. First of all "my" Three-body problem consists of

a static sun (mass 200000 * 10

^{24}kg) in the middle of the programme, and two non static planets that revolve around the sun.

I believe this version of the problem is called the "Astronomers" version.

I am not able to find out the differential equation for my version, and would be glad if somebody could point it out to me (preferably with explainations...).

Thanks

choppu