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 313
Fig. 320. Comets move in every direction in their orbits, and theserbits have every conceivable inclination to the ecliptic. 286 ASTRONOMY. … 11 Fig. 321. 292. Periodic Cornets. — There are quite a number of ASTRONOMY. 287 comets which are known to be periodic, returning to thesun at regular intervals in elliptic orbits. Some of thesehave been observed at sev- eral returns, so that theirperiod has been determinedwith great certainty. In…
Astronomy
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