Other
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.266..434s&link_type=abstract
Nature, vol. 266, Mar. 31, 1977, p. 434, 435. NASA-supported research.
Other
3
Planetary Gravitation, Solar Activity Effects, Solar System, Sunspot Cycle, Tides, Astronomical Models, Earth Tides, Jupiter (Planet), Mercury (Planet), Potential Theory, Power Spectra, Venus (Planet)
Scientific paper
In order to test the tidal theory of sunspots, sun-centered planetary conjunctions and tidal potentials are reconstructed for the period of the Maunder Minimum (1645 to 1715). These are found to be effectively indistinguishable from patterns of conjunctions and power spectra of tidal potential in the modern era of a well-established 11-yr sunspot cycle. The pattern of planetary tidal forces during the Maunder Minimum is then reconstructed to investigate the possibility that multiple-planet forces were somehow fortuituously cancelled at that time; i.e., the positions of the slower moving planets in the late 17th and early 18th centuries were such that conjunctions and tidal potentials were reduced in number and force. Calculations of daily positions for Mercury, Venus, earth, and Jupiter as well as daily values of the tidal potential for the period from 1450 to 2000 indicate no striking dissimilarities between the time of the Maunder Minimum and any other period considered.
Eddy James A.
Smythe C. M.
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