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EVECTION (Latin for " carrying away ") , in astronomy, the largest inequality produced by theSee also: action of the See also: sun in the monthly revolution of the See also: moon around the See also: earth
.
The deviation expressed by it has a maximum amount of about 1° 15' in either direction
.
It may be considered as arising from a semi-See also: annual variation in the eccentricity of the moon's orbit and the position of its perigee
.
It was discovered by See also: Ptolemy
.
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