Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 148
een observed and enumerated by various observersfor about 300 years, and this fluctuation can be traced backthroughout the records, the mean period of the cycle beingbetween 11 and 12 years. It was first pointed out by Schwabeabout the year 1843. The distribution in latitude of the spots shows a… … I A lifeivii. , If H I I I I M I I I I I I I I I n I I I I I I I I I H Fig. 45.—Distribution of Sun-Spots in Latitude throughout Sun-Spot Cycle. latitudes 0° to 30° on either side of the equator. At the com-mencement of a cycle, when the number of Sun-spots is aminimum, the spots occur almost…
Astronomy
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