Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 58
wenty-five days, those farthest fromthe equator in twenty-six or twenty-seven days. Thisremarkable fact has made it very difficult to decidewhat the period of the suns rotation really is, but, asProf. Young says, the probability is that the sun,not being solid, has really no exact period of… … Fig. 14.—A Group of Sun-spots. (From Youngs The Sun.) 5* 54 ASTRONOMY. 40. Phenomena and Cause of Sun-spots.—The spots arecertainly great cavities in the surface of the sun, thebottom of the cavity forming the umbra, and the sides
Astronomy
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