| point of periapsis | | |
| n. | 1. periapsis, point of 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. |
| ~ perilune, periselene | periapsis in orbit around the moon. |
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