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Let's consider a small 3 planet system. One of the planet's is fixed and is a lot heavier than the others. The acelleration is

mP2 * aP2 = - FP3 - FP1

From with the velocity is derived with allows to calculate the positions of the planet's in a simulator program. After running the simulation, The orbit of one of the "moving" planets isn't fixed - some variation occur after each loop.

What can cause this? The other planet (that's not fixed) has an elliptic fixed orbit.

FP = Gravitational Force of Planet

Thanks.

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# Homework Help: Orbital simulator and non fixed orbit

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