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Given two objects of which one orbits the other, for example a planet and a satellite, apoapsis is the point in the satellite's orbit which is furthest (at the greatest distance) from the planet.

The point of the closest approach is the periapsis. According to Kepler's laws of planetary motion; as a planet travels in an elliptical orbit, around a star; as the planet approaches the apoapsis, it will decrease in velocity.\n