Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 202
Fig. 19s. Neighboring spots show no tendency to rotate in the … Fig. 196. same direction. The number of spots in which a decidedcyclonic motion (like that shown in Fig. 198) appears is 184 ASTRONOMY. comparatively small, not exceeding two or three per centof the whole.
Astronomy
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