Geometric precession is the term used to describe the Earth's changing orientation to inertial space not caused by local forces. ...more on Wikipedia about "Geometric precession"
Larmor precession refers to the precession of the magnetic moments of electrons or atomic nucleii in atoms around the direction of an external magnetic field. The magnetic field exerts a torque on the magnetic moment, producing a gyroscopic motion, much like the spinning of a top. The angular velocity of the precession is ...more on Wikipedia about "Larmor precession"
Nutation is a slight irregular motion (etymologically a "nodding") in the axis of rotation of a largely axially symmetric object, such as a gyroscope or a planet. ...more on Wikipedia about "Nutation"
When using, instead of an inertial reference frame, a frame attached to the body of the solid Earth (a so-called Earth-centred, Earth-fixed or ECEF reference frame), the rotation axis also varies slightly. This variation, which is only a few metres measured on the Earth's surface, is called Polar motion. ...more on Wikipedia about "Polar motion"
Precession refers to a change in the direction of the axis of a rotating object. In physics, there are two types of precession, torque-free and torque-induced, the latter being discussed here in more detail. In certain contexts, "precession" may refer to the precession that the Earth experiences, the effects of this type of precession on astronomical observation, or to the precession of orbital objects. ...more on Wikipedia about "Precession"
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