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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.34 no.4 (2007), pp. 307-315
Rhytmites Aid to Reconstruct the Evolution of the Earth-Moon System for the Last 2.5 Ga
G.G. Tenchov
Department of Meteorology and Geophysics, Faculty of Physics, University of Sofia, 5 J. Bautcher Blvd, 1164 Sofia, Bulgaria
go backDepartment of Meteorology and Geophysics, Faculty of Physics, University of Sofia, 5 J. Bautcher Blvd, 1164 Sofia, Bulgaria
Abstract. Rhytmites are observed in corals, bivalves, brachiopods, stromatolites and sedimentary rocks. They indicate that the number of day per year in geologic past of the Earth differs from nowadays and reach 450 days per year at about 1.5 Ga ago. The analysis of the data shows that the Moon came close to the Earth some 1.5 Ga ago. Now it is moving away from the Earth. The angular velocity of the Earth rotation has a maximum at this time as well. This data can be used in further development of the theory of the long-term changes in the Earth history and confirm the hypothesis that the Moon has been captured from the Earth's gravitational field.