Mathematics – Logic
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005acasn..46..322g&link_type=abstract
Acta Astronomica Sinica, vol. 45, no. 3, p. 322-330
Mathematics
Logic
2
Rotation Of Earth, Luni-Solar Tidel Dissipation, Long-Period Variation Of Length-Of-Day, The Earth'S Momentum Variation
Scientific paper
Luni-solar tidel dissipation and the Earth's momentum variation are two main reasons for the long-period variation of length-of-day. Here by using new geophysical data and the paleontological clocks data, we estimate and compare luni-solar tidel dissipation, the Earth's momentum variation,the long-period variation of length-of-day and the length of synodic month in the passed 1500Ma. According to the results, two important conclusions are obtained. Firstly, the variation can not explained only by the Earth's rotational deformation, which means that the dense materials sank toward the Earth center and the low-density materials rise toward the Earth's surface are still going on. Secondly, in the paleogeology period, there were more larger lunar tidel dissipation, under a assumption that lunar tidel dissipation is inversely proportional to the cube of the distance from Earth to moon, the theoretical numbers of days in an year and in a synodic month may coincide very well with that obtained from the paleontological clocks data.
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