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polar motion
subjectfact 
polar motionhas definition The irregularly varying motion of the Earth's pole of rotation with respect to the Earth's crust. (See celestial ephemeris pole.)has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:29:51.0
is a kind of axis motion2001-09-27 09:29:51.0
physical processhas domain physics2001-09-27 09:29:38.0