Evection
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Evection
</dt>
A perturbation
of the moon in its orbit due to the attraction of the sun. This results in an
increase in the eccentricity
of the moon's orbit when the sun passes the moon's line of
apsides and a decrease when perpendicular to it. See lunar
inequality.
</dd>
Evection amounts to 1 degree 15 minutes in the moon's longitude at
maximum. [[/a>|/a>]]
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
