Definition of Precesion
Pre*ces"sion (?), n. [L.
praecedere, praecessum, to go before: cf. F.
précession. See Precede.] The act of going
before, or forward.
Lunisolar precession. (Astron.) See
under Lunisolar. -- Planetary
precession, that part of the precession of the equinoxes
which depends on the action of the planets alone. --
Precession of the equinoxes (Astron.),
the slow backward motion of the equinoctial points along the
ecliptic, at the rate of 50.2″ annually, caused by the action of
the sun, moon, and planets, upon the protuberant matter about the
earth's equator, in connection with its diurnal rotation; -- so called
because either equinox, owing to its westerly motion, comes to the
meridian sooner each day than the point it would have occupied without
the motion of precession, and thus precedes that point
continually with reference to the time of transit and motion.
- Webster's Unabridged Dictionary (1913)
- precedence
- (physics) The wobbling motion of the axis of a spinning body when there is an external force acting on the axis
- (astronomy) The slow gyration of the earth's axis around the pole of the ecliptic, caused mainly by the gravitational pull of the sun and moon
- The Nuttall Encyclopedia
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