- 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
Related formspre·ces·sion·al, adjective
Examples from the Web for precession
In all our examples the slower the spin the quicker is the precession produced by given tilting forces.Spinning Tops|John Perry
How far away from Polaris will the precession carry the pole?A Text-Book of Astronomy|George C. Comstock
Upon the precession of the equinoxes they erect a fabric of retrograde chronology, and set a clock to geologic time.
This variety of opinions proceeded from the precession of the Equinox, then not known to the Greeks.The Chronology of Ancient Kingdoms Amended|Isaac Newton
The precession controls, though operational, had not to date been required.Where I Wasn't Going|Walt Richmond