evection

evection
[ɪˈvɛkʃ(ə)n]
noun
  1. [mass noun](Astronomy)regular variation in the eccentricity of the moon's orbit around the earth, caused mainly by the sun's attraction
    (天文)出差
语源
  1. mid 17th cent. (in the sense 'elevation, exaltation'): from Latin evectio(n-), from evehere 'carry out or up', from e- (variant of ex-) 'out' + vehere 'carry'
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