Nutation and the Earth’s Rotation

Volume 78 of the series International Astronomical Union / Union Astronomique Internationale pp 195-202

A Normal Mode Study of Wobble and Nutation

  • Martin L. SmithAffiliated withCooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA

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The observed eigenperiod of the Chandler Wobble is about 435.2 sidereal days while the theoretical eigenperiod of a rigid body having the same composition and geometry as the Earth is about 305 days. The attempt to reconcile these two numbers has led scientists to study theoretically the free wobble and nutation of various classes of rotating bodies.