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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.]

e·vec′tion·al adj.


(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]
eˈvectional adj


Irregularity in the movement of the Moon caused by variations in the orbit of the Sun.
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Serum creatine kinase levels and renal function measures in evectional muscle damage.
Such months are designated as synodic, anomalistic, tropical, nodical or evectional, according to whether the revolution of the Moon around the Earth is relative to the Sun's position, the shortest distance to the Earth, its passing through the Earth's equator, its passing through the ecliptic, or the variation in the eccentricity of its orbit.