Coriolis force
Lagrangian point stability

In astronomy, Lagrangian points are five positions in the orbital plane of two large orbiting bodies where a small object affected only by gravity can maintain a stable position relative to the two large bodies. The first three Lagrangian points (L, L, L) lie along the line connecting the two large bodies, while the last two points (L and L) each form an equilateral triangle with the two large bodies. The L and L points, although they correspond to maxima of the effective potential in the coordinate frame that rotates with the two large bodies, are stable due to the Coriolis effect. The stability can result in orbits around just L or L, known as tadpole orbits, where trojans can be found. It can also result in orbits that encircle L, L, and L, known as horseshoe orbits.
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