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nounthe act of preceding in time or order or rank (as in a ceremony)
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nounthe motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a conetype of:
Definition that contains precession
- great year time required for one complete cycle of the precession of the equinoxes, about 25,800 years
- platonic year time required for one complete cycle of the precession of the equinoxes, about 25,800 years
- precession of the equinoxes a slow westward shift of the equinoxes along the plane of the ecliptic caused by precession of the Earth's axis of rotation
- hipparchus Greek astronomer and mathematician who discovered the precession of the equinoxes and made the first known star chart and is said to have invented trigonometry (second century BC)