- the slow, conical motion of the earth's axis of rotation, caused by the gravitational attraction of the sun and moon, and, to a smaller extent, of the planets, on the equatorial bulge of the earth.
- precession of the equinoxes.
Origin of precession
Examples from the Web for precession
Historical Examples of precession
It is as much outside 97 our control as the precession of the equinoxes.Waiting for Daylight
Henry Major Tomlinson
If the earth were a perfect sphere, precession would be inexplicable.The Story of the Heavens
Robert Stawell Ball
In fact he had discovered the physical cause of that precession.Pioneers of Science
Of these the principal are devoted to the effect of precession.The Royal Observatory Greenwich
E. Walter (Edwared Walter) Maunder
Its movement we see in the heavens in the precession of the equinoxes.Everyday Objects
W. H. Davenport Adams
Word Origin for precession
1590s, from Late Latin praecissionem (nominative praecissio) "a coming before," from past participle stem of Latin praecedere "to go before" (see precede). Originally used in reference to calculations of the equinoxes, which come slightly earlier each year.