evection(redirected from evectional)
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Solar perturbation of the lunar orbit.
[Latin 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.]
(Astronomy) irregularity in the moon's motion caused by perturbations of the sun and planets
[C17: from Latin ēvectiō a going up, from ēvehere to lead forth, from vehere to carry]
Irregularity in the movement of the Moon caused by variations in the orbit of the Sun.