precession

process

Definition: Precession is a change in the orientation of the rotational axis of a rotating body. In an appropriate reference frame it can be defined as a change in the first Euler angle, whereas the third Euler angle defines the rotation itself. In other words, if the axis of rotation of a body is itself rotating about a second axis, that body is said to be precessing about the second axis. A motion in which the second Euler angle changes is called nutation. In physics, there are two types of precession: torque-free and torque-induced.

Source: Wikipedia

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Occurs in:

• earth_axis_precession__period
• earth_axis_precession__length-per-time_rate
• mercury_axis_precession__period
• mercury_axis_precession__length-per-time_rate