The Laplace plane or Laplacian plane of a planetary satellite, named after its discoverer Pierre-Simon Laplace (1749–1827), is a mean or reference plane about whose axis the instantaneous orbital plane of a satellite precesses.
This plane is sometimes called the satellite's "invariable plane", but the latter term more often refers to the related concept of the sum of all angular momentum vectors in a system. The two are equivalent only in the case where all perturbers and resonances are far from the precessing body.
Read more about Laplace Plane: Definition, Explanation, The Work of Laplace
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