Video encyclopedia

Stellar precession


Precession of the earth


Precession of Equinox


Propagation of differential precession wave of tilted black hole accretion disk simulation


Apsidal precession, disc breaking and viscosity in warped discs: Breaking a disc


Gravitational waves from the merger of strongly precessing black holes

In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis. In particular, it can refer to the gradual shift in the orientation of Earth's axis of rotation in a cycle of approximately 25,772 years. This is similar to the precession of a spinning-top, with the axis tracing out a pair of cones joined at their apices. The term "precession" typically refers only to this largest part of the motion; other changes in the alignment of Earth's axis—nutation and polar motion—are much smaller in magnitude.
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