Astronomy for the use of schools and academies (1882) (14764348585)

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:

Fig. 319. a hyperbola, and, with a less velocity, an ellipse. So, at anydistance from the sun, there is a certain velocity which wouldcause a comet to describe a parabola; while a greater velocitywould cause it to describe a hyperbola, and a less velocity todescribe an ellipse. If the comet is moving in an ellipse, theless its velocity, the less the eccentricity of its orbit: hence, inorder to determine the form of the orbit of any comet, it isonly necessary to ascertain its distance from the sun, and itsvelocity at any given time. ASTRONOMY. 285

Text Appearing After Image:

Fig. 320. Comets move in every direction in their orbits, and theserbits have every conceivable inclination to the ecliptic. 286 ASTRONOMY.

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1882

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