| apoapsis | | |
| n. | 1. apoapsis, point of apoapsis | (astronomy) the point in an orbit farthest from the body being orbited. |
| ~ astronomy, uranology | the branch of physics that studies celestial bodies and the universe as a whole. |
| ~ apogee | apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the Earth. |
| ~ aphelion | apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun. |
| ~ apojove | apoapsis in orbit around Jupiter. |
| ~ apolune, aposelene | apoapsis in orbit around the moon. |
| ~ 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" |
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