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Astronomy for high schools and colleges (1889)
Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 417
er of these telescopiccomets have been found to be periodic. In most cases,the period is many centuries in length, so that the cometshave only been noticed at a single visit. Eight ornine, however, have been found to be of a period so shortthat they have been observed at two or more returns. We… … Fig. 107.—okbit of halleys comet. ORBITS OF COMETS. 399 1 8 ►3 s 1 p CD J•-J CD FayesBrorsei 3D b CO 3go X SB JQ CS pr CDOB* 00* aT o* BO a i CD HJ GC CO TO CO CO CO ■» X 30 If 8 -3 ^> <J Ol -? -3 Ol -3 CO —» Ol <f CO w o » 3 o< *<• 3 ©< S «H W «H g «« > *< O M {3* p- 3s t-l…Astronomy
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