Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 170
Distribution and Periodicity of Spots. 129. Spots do not occur with equal frequency at allpoints of the suns surface, but are generally found withinthe limits of two zones, oue north and the other south ofthe equator and extending from 8° to 40° of solar latitude;they are most numerous in both… … Fig. 74. The Spotted Zones. Explanation. The outer circle represents the suns disk. The solar equatori* parallel to the lower line of spots. 166 ASTRONOMY. The tendency of spots to occur in zones or belts is shownin Fig. 73, taken from a drawing by Trouvelot. Furthermore, spots are not equally…
Astronomy
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