Mathematics – Logic
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspsa.375....1m&link_type=abstract
Royal Society (London), Proceedings, Series A - Mathematical and Physical Sciences, vol. 375, no. 1760, Feb. 18, 1981, p. 1-41.
Mathematics
Logic
20
Earth (Planet), Planetary Evolution, Climatology, Cosmic Rays, Galaxies, Geomagnetism, Long Term Effects, Meteorites, Solar System, Solar Terrestrial Interactions, Tectonics, Volcanoes
Scientific paper
The present state of knowledge about certain terrestrial phenomena is surveyed with a view to discerning the extent to which the behavior of the earth may be influenced by fluctuations in its astronomical environment and determining whether new knowledge of that environment may be gained from its influence on the earth. Fluctuations in, for example, geomagnetism, climate, glaciation, and biological extinctions are surveyed, with special attention given to datings and characteristic time intervals; correlations between such fluctuations are discussed. Astronomical phenomena within the solar system and elsewhere in the galaxy that might have terrestrial effects are reviewed. With regard to the earth, it is noted that there is a good case for the view that fluctuations in glaciation within an ice epoch result from changes in insolation accompanying fluctuations in the earth's motion relative to the sun. It is suggested that impacts of planetesimals may be more important than hitherto recognized. With regard to the sun, it is noted that while the intensity of solar activity is variable, terrestrial effects provide no confirmation that the sun is a variable star.
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