The earth's inconstant rotation

Details The earth's inconstant rotation The earth's inconstant rotation

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986s%26t....71..545w&link_type=abstract

Sky and Telescope (ISSN 0037-6604), vol. 71, June 1986, p. 545-549.

Physics

Daytime, Earth Rotation, Periodic Variations, Polar Wandering (Geology), Axes Of Rotation, Earth-Moon System, Gravitational Effects, Lageos (Satellite), Laser Range Finders, Lunar Rangefinding, Lunar Tides, Very Long Base Interferometry

Scientific paper

The effects of the earth's varying rotation on the length of day (LOD) and the orientation of the earth's rotation axis are studied. The use of lunar laser ranging, the Laser Geodynamics Satellite, or a very-long-baseline interferometer to examine LOD changes and polar motion is described. Observational data reveal that the LOD increases at a rate of 2 ms/century, irregular changes of about 4 to 5 ms occur over 20-to-30 year periods, and variations occur in the LOD with periods shorter than 5 years. The position of the pole follows a clockwise, circular path around a mean position, and annual and Chandler wobbles are detected. The relationship between the moon and sun and the LOD and polar motion is analyzed. The influence of the earth's changing internal mass distribution on gravitational field is investigated. The roles of electromagnetic forcing on decade fluctuations, and lunar tides and atmospheric changes on short-period fluctuations are discussed.

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