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Image from page 290 of "Astronomy for the use of schools and academies" (1882) | by Internet Archive Book Images
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Image from page 290 of "Astronomy for the use of schools and academies" (1882)

Identifier: astronomyforuseo00gill

Title: Astronomy for the use of schools and academies

Year: 1882 (1880s)

Authors: Gillet, J. A. (Joseph Anthony), 1837-1908 Rolfe, W. J. (William James), 1827-1910

Subjects: Astronomy

Publisher: New York : Potter, Ainsworth, & Co.

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress



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Text Appearing Before Image:

Fig. 291. ASTRONOMY. 263 the ring is a much brighter portion, and outside of thisanother, which is somewhat fainter, but still so much brighterthan the dusky part as to be easily seen. The width of thebrighter parts of the ring is over three times the earthsdiameter. To distinguish the parts, the outer one is calledring A, the middle one ring B, and the dusky one ring C.Between A and B is an apparently open space, nearly twothousand miles wide, which looks like a black line on thering. Other divisions in the ring have been noticed attimes; but this is the only one always seen with good tele-scopes at times when either side of the ring is in view fromthe earth. The general telescopic appearance of the ringis shown in Fig. 291.


Text Appearing After Image:

Fig. 292. Fig. 292 shows the divisions of the rings as they wereseen by Bond. 271. Phases of Saturns Ring. — The ring is inclinedto the plane of the planets orbit by an angle of twenty-seven degrees. The general aspect from the earth is nearlythe same as from the sun. As the planet revolves aroundthe sun, the axis and plane of the ring keep the samedirection in space, just as the axis of the earth and theplane of the equator do. When the planet is in one part of its orbit, we see the 264 ASTRONOMY. upper or northern side of the ring at an inclination oftwenty-seven degrees, the greatest angle at which the ringcan ever be seen. This phase of the ring is shown inFig. 293.



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