Abstract
IT has long been known, and Dr. Rudolf Wolf of Zurich was the first to draw attention to it, that the length of a sunspot period is only in the mean eleven years, and that the real length of any one period might differ from this value by as much as ± two years. Another fact of observation is that the times of maxima do not occur a constant number of years after a preceding minimum, and Dr. Wolf determined the mean interval as 4.5 years. The minimum also follows the maximum in a mean interval of 6.5 years.
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LOCKYER, W. A Long Period Sunspot Variation . Nature 64, 196–197 (1901). https://doi.org/10.1038/064196a0
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DOI: https://doi.org/10.1038/064196a0
