Abstract
Abstract Comparison was made between the heliocentric synodic periods of the five outer planets and a periodogram of sunspot numbers with alternate cycles reversed, adjusted for the dominant 22.22‐yr cycle and with excessive peaks and troughs minimized. Eight synodic periods are available for comparison between 12 and 150 yrs. The periodogram suggests the possibility of 16 sunpot cycles between these lengths. Five of the conjunction periods correspond to suggested sunspot number cycles within about onetenth of 1% of the indicated cycle length. A sixth conjunction period corresponds within about 1% of the indicated cycle length. No theory of relationship is advanced.
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