Earth rotation and polar motion - Measurements and implications

Astronomy and Astrophysics – Astronomy

Scientific paper

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Earth Rotation, Geodynamics, Polar Wandering (Geology), Angular Momentum, Astrometry, Atmospheric Effects, Celestial Geodesy, Kalman Filters, Laser Range Finders, Lunar Rangefinding, Very Long Base Interferometry

Scientific paper

Several methods used to measure earth rotation and polar motion are discussed. The development of techniques for combining smoothing, and intercomparing geodetic measurements is described. Emphasis is given to measurements obtained since 1980 using VLBI, lunar laser ranging (LLR) and satellite laser ranging (SLR) techniques. The calculation of atmospheric angular momentum (AAM) excitation functions is outlined, and a comparison of AAM excitation functions with variations in the length of day (LOD) and polar motion data is presented. The geophysical implications of geodetic measurements are addressed.

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