Celestial mechanics

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Celestial mechanics is the branch o astronomy that deals wi the motions o celestial objects. The field applies principles o pheesics, historically classical mechanics, tae astronomical objects such as starns an planets tae produce ephemeris data. Orbital mechanics (astrodynamics) is a subfield which focuses on the orbits o airtifeecial satellites. Lunar theory is anither subfield focusin on the orbit o the Muin.