"In #CelestialMechanics, the #LagrangePoints (/lə.ˈɡrɑːndʒ/; also #Lagrangian points or #Libration points) are points of equilibrium for small-mass objects under the gravitational influence of two #MassiveOrbitingBodies. Mathematically, this involves the solution of the #RestrictedThreeBodyProblem."