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Image from page 283 of "Astronomy for the use of schools and academies" (1882) | by Internet Archive Book Images
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Image from page 283 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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256 ASTRONOMY. 263. Distance of Saturn from the Earth.—The meandistance of Saturn from the earth at opposition is eight hun-dred and eighty million miles minus ninety-two millionmiles, or seven hundred and eighty-eight million ; and atconjunction, eight hundred and eighty million miles plusninety-two million, or nine hundred and seventy-two million.Owing to the eccentricity of the orbit of Saturn, his dis-tance from the earth at opposition and at conjunction variesby about a hundred million miles at different times ; but heis so immensely far away, that this is only a small fractionof his mean distance. 264. Apparent Size and Brightness of Saturn. — Theapparent diameter of Saturn varies from about twenty sec-onds to about fourteen seconds. His apparent size at his


Text Appearing After Image:

Fig. 285. extreme and mean distances from the earth is shown inFig. 285. The planet generally shines with the brilliancy of a mod-erate first-magnitude star, and with a dingy, reddish light,as if seen through a smoky atmosphere. 265. Volume and Density of Saturn. — The real diame-ter of Saturn is about seventy thousand miles, and itsvolume over seven hundred times that of the earth. Thecomparative size of the earth and Saturn is shown in Fig.286. This planet is a little more than half as dense asJupiter. 266. The Sidereal and Synodical Periods of Saturn.—Saturn makes a complete revolution round the sun in aperiod of about twenty-nine years and a half, moving inhis orbit at the rate of about six miles a second. The ASTRONOMY. 257 planet passes from opposition to opposition again in aperiod of three hundred and seventy-eight days, or thirteendays over a year. 267. Physical Constitution of Saturn. — The physicalconstitution of Saturn seems to resemble that of Jupiter;but, being twi



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