Definition that contains precess
- 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)