apsidal motions

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• Newton's theorem of revolving orbits — Figure 1: An attractive force F(r) causes the blue planet to move on the cyan circle. The green planet moves three times faster and thus requires a stronger centripetal force, which is supplied by adding an attractive inverse cube force. The …   Wikipedia

• Orbital resonance — For the science fiction novel by John Barnes, see Orbital Resonance (novel). In celestial mechanics, an orbital resonance occurs when two orbiting bodies exert a regular, periodic gravitational influence on each other, usually due to their… …   Wikipedia

• Lunar precession — Unreferenced|date=May 2007There are two important precessional motions in the Orbit of the Moon.The long axis (line of the apsides: perigee and apogee) of the moon s elliptical orbit precesses about once in just under 9 years. It is caused by the …   Wikipedia