The James Webb Space Telescope is located in one of the Sun-Earth [Lagrange points](https://en.wikipedia.org/wiki/Lagrange_point). The Lagrange points are a set of equilibrium solutions of the restricted three-body problem, a version of the three body problem where the mass of the third object is so insignificant that its influence on the two other objects is not considered at all. The restricted three-body problem is mainly a two-body problem, for which there *do* exist analytic solutions.
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