| 释义 |
retrogradation/ˌretrəʊɡrəˈdeiʃ(ə)n/n. Astron. 【天】 1 the apparent backward motion of an outer planet, from east to west, when it is overtaken in its orbit by the earth (外行星在其轨道范围被地球赶上时看上去自东向西的)倒行 2 the orbiting of a celestial body in a reverse direction to normal (天体的)逆行 [Late Latin retrogradatio (as RETRO-, GRADATION)] |