Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981azh....58..590k&link_type=abstract
Astronomicheskii Zhurnal, vol. 58, May-June 1981, p. 590-596. In Russian.
Astronomy and Astrophysics
Astronomy
2
Earth Rotation, Earth Tides, Lunar Orbits, Solar Activity Effects, Solar Terrestrial Interactions, Friction, Periodic Variations, Solar Cycles
Scientific paper
The problem of the magnitude of the tidal retardation of the earth's rotation and the orbital motion of the moon is considered. The secular deceleration of lunar motion deduced from an analysis of ancient and medieval eclipses is larger than that obtained by recent telescope observations. It is shown that this discrepancy vanishes if the acceleration of the earth's rotation due to secular variations of solar activity is taken into account. This result assumes that the mean tidal friction has remained essentially constant over the last two millenia. In addition, nontidal variations of the earth's rotation rate during the last two millenia as well as at the present time are shown to be caused by variations of solar activity.
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