Video encyclopedia

Stellar precession


Precession of the earth


The helical model - our solar system is a vortex


Stellar Abberation


Geodetic Precession in Pulsar J1906+0746


Gyroscopic Precession Demo! | Arbor Scientific

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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