The history of our solar system has been greatly influenced by the fact
that there is a large gas giant planet, Jupiter that has a nearly circular
orbit. This has allowed relics of the early solar system formation to still be
observable today. Since Jupiter orbits the Sun with a period of approximately
12 years, it has always been thought that this could be connected to the nearly
11-year periodic peak in the number of sunspots observed. In this paper, the
Sun and planets are considered to be moving about a center of mass point as the
different planets orbit the Sun. This is the action of gravity that holds the
solar system together. The center of mass for the Jupiter-Sun system actually
lies outside the Sun. The four gas giant planets dominate such effects and the
four gas giant Jovian planets can be projected together to determine an
effective distance from the Sun’s
center. Taken together these effects do seem to function as a sunspot forcing
factor with a periodicity very close to 11 years. These predictions are made
without consideration of any details of what is happening in the interior of
the Sun. From these estimates, sunspot cycle 25 will be expected to peak in
about September-October of 2025. Sunspot cycle 26 should peak in the year March
of 2037.
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