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 208
Fig. 202. 186. The Proper Motion of the Spots. — When theperiod of the suns rotation is deduced from the motion ofspots in different solar latitudes, there is found to be con-siderable variation in the results obtained. Thus spots near 188 ASTRONOMY.
Astronomy
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