File:Astronomy for the use of schools and academies (1882) (14577639418).jpg

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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. 232. but not sufficiently to attract attention, or to be denomi-nated an eclipse. 207. The Lunar Ecliptic Limits. —In Fig. 236 the line!A B represents the plane of the ecliptic, and the line CD th<moons orbit. The large black circles on the line A B represent sections of the umbra of the earths shadow, and th<smaller circles on CD represent the moon at full. It will b(seen, that, if the moon is full at E, she will just graze the ASTRONOMY. 213 umbra of the earths shadow. In this case she will suffer noeclipse. Were the moon full at any point nearer her node, asat F, she would pass into the umbra of the earths shadow, andwould be partially eclipsed. Were the moon full at c7, shewould pass through the centre of the earths shadow, and betotally eclipsed. It will be seen from the figure that full moon must occur
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Fig. 233. when the moon is within a certain distance from her node, inorder that there may be a lunar eclipse; and this space iscalled the lunar ecliptic limits. The farther the earth is from the sun, the less rapidly doesits shadow taper, and therefore the greater its diameter at thedistance of the moon; and, the nearer the moon to the earth,the greater the diameter of the earths shadow at the distanceof the moon. Of course, the greater the diameter of the 214 ASTRONOMY. earths shadow, the greater the ecliptic limits: hence the lunarecliptic limits vary somewhat from time to time, according tothe distance from the earth to the sun and from the earthto the moon. The limits within which an eclipse is inevitableunder all circumstances are called the 77iinor ecliptic limits;\and those within which an eclipse is possible under some cir-cumstances, the major ecliptic limits. 208. Lunar Eclipses. — Fig. 237 shows the path of themoon through the earths shadow in the case of a partialeclips

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