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Published online by Cambridge University Press: 12 April 2016
Geodynamics can be defined as the study of the motions of Earth with respect to its own center of mass and three locally-inertial directions. These motions include rotations of the whole Earth, as well as episodic, cyclic and secular deformations of the crust, and internal fluid circulations. Geodynamics is still largely an observational science, since there is yet no satisfactory theory to account for several of the most interesting of these motions. The observational aspects of geodynamics are basically astronomical, since the most obvious effects of terrestrial rotation and deformation (excepting of course occasional cataclysmic deformations) are seen as variations in the apparent positions of celestial bodies, as observed from the surface of the mobile, non-rigid Earth.