A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 146
expresses the same sentiment. 303. The distances to which those comets that returnmust go, to be so long absent, must be very great. Stilltheir bounds are set by the great law of gravitation, forwere they to pass the point where gravitation turns theother way, they wTould never return. But some,… … 304. The perihelion distances of the various cometsthat have appeared, and whose elements have been esti-mated by astronomers, are also exceedingly variable.While some pass very near the sun, others are at an im-mense distance from him, even at their perihelion. Of137 that have been particularly…
Astronomy
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