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The elements of astronomy; a textbook (1919) (14782253045)

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The elements of astronomy; a textbook (1919) (14782253045)

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Identifier: elementsofastro00youn (find matches)
Title: The elements of astronomy; a textbook
Year: 1919 (1910s)
Authors: Young, Charles A. (Charles Augustus), 1834-1908 Young, Anne Sewell, b. 1871., ed
Subjects: Astronomy Constellations
Publisher: Boston, New York (etc.) Ginn and Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress



Text Appearing Before Image:
its orbit. 358. Surface, Albedo, Spectrum. — The disc of the planet,like that of Jupiter, is shaded at the edge, and like Jupiter itshows a number of belts arranged parallel to the equator. Theequatorial belt is very bright (not relatively quite so much so,however, as represented in Fig. 87), and is often of a delicatepinkish tinge. The belts in higher latitudes are comparativelyfaint and narrow, while just at the pole there is usually a capof olive green. Occasionally there are slight irregularities inthe edges of the belts. Zollner makes the mean albedo of the planet 0.52, about thesame as that of Venus. The planets spectrum is substantially like that of Jupiter,but the dark bands are rather more pronounced. These bands,however, do not appear in the spectrum of the ring, whichprobably has very little atmosphere. As to the physical con-dition and constitution of the planet, it is probably much likeJupiter, though it does not seem to be boiling quite sovigorously. 254 SATURN. (§358
Text Appearing After Image:
Fig. 87. — Saturn and his Rings. § 359) THE RINGS. 255 359. The Rings. — The most remarkable peculiarity of theplanet is its ring system. The globe is surrounded by threethin, flat, concentric rings, like circular discs of paper piercedthrough the centre. They are generally referred to as A, B,and C, A being the exterior one. Galileo half discovered them in 1610; that is, he saw with hislittle telescope two appendages on each side of the planet; but hecould make nothing of them, and after a while he lost them. Theproblem remained unsolved for nearly 50 years, until Huyghensexplained the mystery in 1655. Twenty years later D. Cassini dis-covered that the ring is double; i.e., composed of two concentricrings, with a dark line of separation between them; and in 1850Bond of Cambridge, U.S., discovered a third dusky or gauze ring between the principal ring and the planet. (It was discovereda fortnight later, but independently, by Dawes in England.) The outer ring, A, has a diameter of

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