periapsis(redirected from periapses)
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n. pl. per·i·ap·si·des (-sĭ-dēz′)
The point at which an orbiting object is closest to the center of mass of the body it is orbiting.
(Astronomy) astronomy the closest point to a central body reached by a body in orbit
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|Noun||1.||periapsis - (astronomy) the point in an orbit closest to the body being orbited|
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
celestial point - a point in the heavens (on the celestial sphere)
celestial orbit, orbit - the (usually elliptical) path described by one celestial body in its revolution about another; "he plotted the orbit of the moon"
perigee - periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth
perihelion - periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun
perijove - periapsis in orbit around Jupiter