Astronomy for the use of schools and academies (1882) (14577596607)

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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Fig. 282. they can see through the clouds) these eclipses must bevery familiar affairs ; for in consequence of the small incli-nations of the orbits of the satellites to the planets equator,and the small inclination of the latter to the plane ofJupiters orbit, all the satellites, except the most distant one, 254 ASTRONOMY. are eclipsed in every revolution. A spectator on Jupitermight therefore witness during the planetary year forty-fivehundred eclipses of the moons, and about the same numberof the sun. 259. Transits of Jupiters Satellites. — Whenever oneof Jupiters moons passes in front of the planet, it is saidto make a transit across his disk. When a moon is makinga transit, it presents its bright hemisphere towards the earth,as will be seen from Fig. 282 : hence it is usually seen as abright spot on the planets disk: though sometimes, on thebrighter central portions of the disk, it appears dark.