Polar motion
Motion of Earth's rotational axis relative to its crust / From Wikipedia, the free encyclopedia
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This article is about motion relative to the crust. For motion relative to an astronomical framework, see axial precession and astronomical nutation.
Polar motion of the Earth is the motion of the Earth's rotational axis relative to its crust.[2]: 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.