Quote:
Originally Posted by Robert Tulip
Thanks Ray, in JimP’s chart of sunspots against barycentre, you can clearly see the minima alignment to the 178.9 year cycle. I take your point that this is not proof of a physical connection, given that the average sunspot period here (178.35 years) is half a year less than the SSB cycle, producing a very small drift forward of sunspots against each SSB cycle. Comparing the periods 1734-1755 = 1913-1933 you can see the SSB and sunspot minima are both directly aligned to the Jupiter-Saturn cycle. I think this is worth further study. The data for these patterns are here.
Code:
Sunspot Cycles and the Solar System Barycentre
Minima Maxima
year year period year year period
1619 1798.3 179.3 1626 1805.2 179.2
1634 1810.6 176.6 1639.5 1816.4 176.9
1645 1823.3 178.3 1649 1829.9 180.9
1655 1833.9 178.9 1660 1837.2 177.2
1666 1843.5 177.5 1675 1848.1 173.1
1679.5 1856 176.5 1685 1860.1 175.1
1689 1867.2 178.2 1693 1870.6 177.6
1698 1878.9 180.9 1705.5 1883.9 178.4
1712 1889.6 177.6 1718.2 1894.1 175.9
1723.5 1901.7 178.2 1727.5 1907 179.5
1734 1913.6 179.6 1738.7 1917.6 178.9
1745 1923.6 178.6 1750.3 1928.4 178.1
1755.2 1933.8 178.6 1761.5 1937.4 175.9
1766.5 1944.2 177.7 1769.7 1947.5 177.8
1775.5 1954.3 178.8 1778.4 1957.9 179.5
Average 178.3533 177.6
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Well I don't know about these dates for minima in the first column. Here is the wikipedia graph of sunspots over the period and you can see that you need a good imagination to fit them.
Whatever, you are producing only 15 cycles in 178 years. That is an average of 11.86 years which is Jupiter's period around the Sun. It certainly is the correct measure of the dominant period in the COM motion. However it is
not the correct period for the sunspot cycle. The average period is much nearer to 178 / 16 = 11.1 years.
It should be added that the sunspot cycle does follow Jupiter's period (11.86 years) for a while and then races off and follows J-S conjunctions for a while (9.93 years) and then back again, averaging out at 11.08 years over the last 2500 years according to Schove's data.