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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 eclip…

Of or pertaining to pression; as, the precessional movement of the equinoxes.

the united action, or pertaining to the mutual relations, of the sun and moon. Lunisolar precession (Astron.), that portion of the annual precession of the equinoxes which depends on the joint action of the sun and moon. -- Lunisolar year, a period of time, at the end of which, in the Julian calendar, the new and ful…

pect to the equinoxes; -- called also great year. This revolution, which is caused by the precession of the equinoxes, is accomplished in about 26,000 years. Barlow.

onds, which is 20 minutes, 23.3 seconds shorter than the sidereal year, on account of the precession of the equinoxes.

in the right ascension or declination of a star, produced by the combined effects of the precession of the equinoxes and the proper motion of the star. -- Calculus of variations. See under Calculus. -- Variation compass. See under Compass. -- Variation of the moon (Astron.), an inequality of the moon's motion, depe…