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| celestial mechanics | The part of physics and astronomy that deals with the motions of celestial bodies under the influence of the irmutual gravitational attraction. |
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| perturbation | A deviation of the orbit of a solar system body from a perfect ellipse due to the gravitational attraction of one of the planets. |
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| stellar occultation | The obstruction of the light from a star when a solar system body passes between the star and the observer. |