Astronomy for the use of schools and academies (1882) (14761832404)

Identifier: astronomyforuseo00gill (find matches)

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

Text Appearing Before Image:

present time, though some observershave thought they discerned indications of such volcanoes. 117. Copernicus. — This is one of the grandest of lunarcraters (Fig. 137). Although its diameter (forty-six miles)is exceeded by others, yet, taken as a whole, it forms one ofthe most impressive and interesting objects of its class.Its situation, near the centre of the lunar disk, renders allits wonderful details conspicuous, as well as those of objectsimmediately surrounding it. Its vast rampart rises to up-wards of twelve thousand feet above the level of the plateau,nearly in the centre of which stands a magnificent group ofcones, three of which attain a height of more than twenty-four hundred feet. Many ridges, or spurs, may be observed leading away fromthe outer banks of the great rampart. Around the crater,extending to a distance of more than a hundred miles onevery side, there is a complex network of bright streaks, ASTRONOMY. 121 which diverge in all directions. These streaks do not

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appear in the figure, nor are they seen upon the moon, 122 ASTRONOMY, except at and near the full phase. They show conspicu-ously, however, by their united lustre on the full moon. This crater is seen just to the south-west of the largedusky plain in the upper part of Fig. 132. This plain isMare Imbrium, and the mountain-chain seen a little to theright of Copernicus is named the Apennines, Copernicus

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1882

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