Perturbation (astronomy)
Classical approach to the many-body problem of astronomy / From Wikipedia, the free encyclopedia
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In astronomy, perturbation is the complex motion of a massive body subjected to forces other than the gravitational attraction of a single other massive body.[1] The other forces can include a third (fourth, fifth, etc.) body, resistance, as from an atmosphere, and the off-center attraction of an oblate or otherwise misshapen body.[2]