new icn messageflickr-free-ic3d pan white
Image from page 296 of "Astronomy for the use of schools and academies" (1882) | by Internet Archive Book Images
Back to photostream

Image from page 296 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



View Book Page: Book Viewer

About This Book: Catalog Entry

View All Images: All Images From Book


Click here to view book online to see this illustration in context in a browseable online version of this book.



Text Appearing Before Image:

ng. Struve, in 1851, advanced the startling theory that the inneredge of the ring was gradually approaching the planet, the ASTRONOMY. 269 whole ring spreading inwards, and making the central openingsmaller. The theory was based upon the descriptions anddrawings of the rings by the astronomers of the seventeenthcentury, especially Huyghens, and the measures made by laterastronomers up to 1851. This supposed change in the dimen-sion of the ring is shown in Fig. 300. 274. Constitution of Saturns Ring. — The theory now gen-erally held by astronomers is, that the ring is composed of acloud of satellites too small to be separately seen in the tele-scope, and too close together to admit of visible intervalsbetween them. The ring looks solid, because its parts aretco small and too numerous to be seen singly. They are likethe minute drops of water that make up clouds and fogs,which to our eyes seem like solid masses. In the dusky ringthe particles may be so scattered that we can see through


Text Appearing After Image:

Fig. 300. the cloud, the duskiness being due to the blending of light anddarkness. Some believe, however, that the duskiness is causedby the darker color of the particles rather than by their beingfarther apart. Uranus. 275. Orbit and Dimensions of Uranus. — Uranus, thesmallest of the outer group of planets, has a diameter ofnearly thirty-two thousand miles. It is a little less densethan Jupiter, and its mean distance from the sun is aboutseventeen hundred and seventy millions of miles. Its orbithas about the same eccentricity as that of Jupiter, and isinclined less than a degree to the ecliptic. Uranus makes 270 ASTRONOMY.



Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

6 faves