Precession refers to a specific change in the direction of the rotation axis of a rotating object, in which the second Euler angle (angle of nutation) is constant

Precession may refer to:

• Precession, one of the Euler rotations
• Axial precession or precession of the equinoxes, the precession of the Earth's axis of rotation
• de Sitter precession, a general relativistic correction to the precession of a gyroscope near a large mass such as the Earth
• Larmor precession, the precession of the magnetic moments of electrons, atomic nuclei, and atoms about an external magnetic field
• Lense-Thirring precession, a general relativistic correction to the precession of a gyroscope near a large rotating mass such as the Earth
• Phase precession, a pattern of neuronal firing in relation to local neuron populations
• Precession (mechanical), the process of one part rotating with respect to another due to fretting between the two
• Thomas precession, a special relativistic correction to the precession of a gyroscope in a rotating non-inertial frame
• Apsidal precession, the rotation of the orbit of a celestial body

See also

• Axial tilt, the inclination angle of a planet's rotational axis in relation to a perpendicular to its orbital plane
• Conventional International Origin, a conventionally defined reference axis of the pole's average location over the year 1900
• Great year, the time required for one complete cycle of the precession of the equinoxes
• Nutation, a slight irregular motion (etymologically a "nodding") in the axis of rotation of a largely axially symmetric object
• Polar motion, the movement of Earth's rotation axis across its surface