Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 320
d during the threat- ASTRONOMY. 293 ened invasion of Europe by the Turks, it caused great alarm.Fig. 328 shows the changes undergone by the nucleus of thiscomet during its perihelion passage in 1835. 298. Enckes Comet. — This telescopic comet, two views ofwhich are given in Figs. 329 and 330,… … Fig. 328. sive returns of this comet, it has been ascertained that itsorbit is continually growing smaller and smaller. To accountfor the retardation of this comet, Olbers announced his cele-brated hypothesis, that the celestial spaces are filled with asubtile resisting medium. This hypothesis was…
Astronomy
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