a periodical variation in the motion of the moon in its orbit, caused by the attraction of the sun
Origin of evectionClassical Latin evectio, a going up, carrying out from evectus, past participle of evehere from e-, out, from + vehere, to carry: see way
Solar perturbation of the lunar orbit.
Origin of evectionLatin ēvectiō ēvectiōn- a going up from ēvectus past participle of ēvehere to raise up ē-, ex- up from ; see ex- . vehere to carry ; see wegh- in Indo-European roots.