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Laplace-Lagrange secular theory

(Laplace-Lagrange secular evolution theory)
(theory of evolution of planetary orbits)

Laplace-Lagrange secular theory (or Laplace-Lagrange secular evolution theory) is a theory of the (secular) perturbation of planet orbits (a perturbation theory) that grew from the work of Laplace and Lagrange. It was developed to investigate whether Newtonian dynamics is consistent with stable solar system planetary orbits.

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