Polar motion

Polar motion of the Earth is the motion of the Earth's rotational axis relative to its crust.: 1  This is measured with respect to a reference frame in which the solid Earth is fixed (a so-called Earth-centered, Earth-fixed or ECEF reference frame). This variation is a few meters on the surface of the Earth.

This article is about motion relative to the crust. For motion relative to an astronomical framework, see axial precession and astronomical nutation.
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