Astronomy for the use of schools and academies (1882) (14761822224)

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



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librations, and make aspot on the moons disk seem to an observer on the earthto oscillate to and fro, would cause the earth as a whole toappear to a lunar observer to oscillate to and fro in theheavens in a similar manner. It is a well-known fact, that, at the time of new moon, thedark part of the moons surface is partially illumined, sothat it becomes visible to the naked eye. This must be dueto the light reflected to the moon from the earth. Since atnew moon the moon is between the earth and sun, it follows,that, when it is new moon at the earth, it must be full earthat the moon : hence, while the bright crescent is enjoyingfull sunlight, the dark part of its surface is enjoying thelight of the full earth. Fig. 126 represents the full earth asseen from the moon. The Atmosphere of the Moon.in. The Moon has no Appreciable Atmosphere. — Thereare several reasons for believing that the moon has little orno atmosphere. HO ASTRONOMY. (i) Had the moon an atmosphere, it would be indicated
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at the time of a solar eclipse, when the moon passes overthe disk of the sun. If the atmosphere were of any con- ASTRONOMY. Ill