This is similar to the precession of a spinning top, with the axis tracing out a pair of cones joined at their apices. ![]() In particular, axial precession can refer to the gradual shift in the orientation of Earth's axis of rotation in a cycle of approximately 26,000 years. In the absence of precession, the astronomical body's orbit would show axial parallelism. In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis. Earth rotates (white arrows) once a day around its rotational axis (red) this axis itself rotates slowly (white circle), completing a rotation in approximately 26,000 years ![]() For non-axial astronomical precession, see Astronomical precession. For precession of the axes outside of astronomy, see Precession. This article is about the astronomical concept.
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