Precession

[pri'seʃәn]

解释:

(noun.) the act of preceding in time or order or rank (as in a ceremony).

(noun.) the motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone.

埃尔莎整理--From WordNet

解释:

(n.) The act of going before, or forward.

录入:露西

解释:

n. the act of going before: a moving forward.—adj. Preces′sional.—Precession of the equinoxes a slow backward motion of the equinoctial points along the ecliptic caused by the greater attraction of the sun and moon on the excess of matter at the equator such that the times at which the sun crosses the equator come at shorter intervals than they would otherwise do.

乔茜录入