Regular variation in the eccentricity of the moon's orbit around the earth, caused mainly by the sun's attraction.
〔天文〕出差
Origin
Mid 17th century (in the sense 'elevation, exaltation'): from Latin evectio(n-), from evehere 'carry out or up', from e- (variant of ex-) 'out' + vehere 'carry'.
Definition of evection in US English:
evection
nounəˈvɛkʃ(ə)nəˈvekSH(ə)n
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
Origin
Mid 17th century (in the sense ‘elevation, exaltation’): from Latin evectio(n-), from evehere ‘carry out or up’, from e- (variant of ex-) ‘out’ + vehere ‘carry’.