| 单词 | periapsis |
| 释义 | periapsis (once / 11819311 pages) n WORD FAMILY periapsis USAGE EXAMPLESAt first the planet has not yet passed through its periapsis, the blue color is light from the star reflected towards us. Scientific American(Dec 21, 2011) n (astronomy) the point in an orbit closest to the body being orbited Syn|Ant|Hypo|Hyper point of periapsis apoapsis, point of apoapsis (astronomy) the point in an orbit farthest from the body being orbited perigee periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth perihelionperiapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun perijoveperiapsis in orbit around Jupiter perilune, periseleneperiapsis in orbit around the moon celestial point a point in the heavens (on the celestial sphere) |
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