Image from page 155 of "Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere" (1875)
Title: Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere
Authors: Lockyer, Norman, Sir, 1836-1920
Publisher: New York, D. Appleton and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
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the transparent ring lie ? What is said of the occurrence of transits, eclipses, and occnltations of thesatellites? 282. What constitute the most interesting feature of this planet?What was Saturn at first supposed to resemble? What were the rings firstcalled? Who discovered the true nature of the rings, and when? How didHuyghens announce his discovery ? State the discoveries successively made re- 148 THE INFEEIOE AND SUPEEIOE PLANETS. was discovered to be divided as the whole system hadonce been thought to be; last of all comes evidence thatthe smaller divisions in the various rings are subject tochange, and that the ring-system itself is probably increas-ing in breadth, and approaching the planet. 283. Fig. 63 will give an idea of the appearance pre-sented by Saturn and its strange but beautiful appendage;also of its size as compared with the Earth. It will beshown in Chapter XII. that we see sometimes one surfaceof the ring-system, sometimes another, and occasionallyonly its edge.
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Fig. 63.—Saturn and the Eakxh—Comparative Size. 284. The ring-system is situated in the plane of theplanets equator, and its dimensions are as follows :— specting the rings of Saturn. 283. Do wc always see the same part of the ring-system ? 284. In what plane is the ring-system situated ? What is the distance THE KINGS OF SATUEN. 149 Outside diameter of outer ring, . Inside Distance from outer to inner ring,Outside diameter of inner ring, .Inside Inside dark ring, . Distance from dark ring to planetEquatorial diameter of planet, So that the breadths of the three principalthe entire system, are as follows:— Miles. 166,920147,670 91,780 9,760 71,900 rings, and of Miles. Outer bright ring, 9,625 Inner bright ring, 17,605 Dark ring, 8,660 Entire system, 37,570 In spite of this enormous breadth, the thickness of therings is not supposed to exceed 100 miles. 285. Of what, then, are these rings composed ? Thereis great reason for believing that they are neither solid norliquid. The i
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