File:Astronomy for the use of schools and academies (1882) (14577573838).jpg

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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136 ASTRONOMY. 133. Aspects of a Superior Planet. — The four aspects ofa superior planet are shown in Fig. 150, in which S is theposition of the sun, E that of the earth, and P that of theplanet. When the planet is on the opposite side of the earth tcthe sun, as at P, it is said to be in opposition. The sur
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and the planet will then appear in opposite parts of theheavens, the sun appearing at C, and the planet at A. When the planet is on the opposite side of the sun tothe earth, as at P, it is said to be in superior conjunction.It will then appear in the same part of the heavens as thesun, both appearing at C. When the planet is at Pf and P9 so that a line drawnfrom the earth through the planet will make a right anglewith a line drawn from the earth to the sun, it is said to be ASTRONOMY. 137 in quadrature. At Pr it is in its western quadrature, and atP in its eastern quadrature. 134. Phases of a Superior Planet. — Mars is the onlyone of the superior planets that has appreciable phases.At quadrature, as will appear from Fig. 151, Mars does notpresent quite the same side to the earth as to the sun :hence, near these parts of its orbit, the planet appears slightlygibbous. Elsewhere in its orbit, the planet appears fall. All the other superior planets are so far away from thesun and earth,

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