Abstract
Studies of the earth's rotation provide one of the best means of probing the interactions of the atmosphere, oceans, and solid earth as well as the structure of the core and mantle. Since the last report of the U.S. National Report to the IUGG [Tapley, 1983], two developments have led to significant improvement in the measurement of the rotation: the upgrading of the laser network of the National Aeronautics and Space Administration (NASA), and the expansion of VLBI observations coordinated by the National Geodetic Survey (NGS), with the support of NASA and the U. S. Naval Observatory. Both of these developments have been complemented by strong contributions from other countries. The availability of more accurate measurements, together with healthy research support in this field by federal agencies, has also created a ripe environment for progress in theoretical studies of the rotation.
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