Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 417
r 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… … I Fig. 107.—obbit of halleys comet. ORBITS OF COMETS. 399 TempeHalley 5 3 FayesBrorsei r I* 3 ? ^ s 03* tn =*■ CO CD* £ S fii ? ^ oT 1 • r 1—1 i—k 1-^ H-l ? CK. oo 00 00 00 00 00 OO 00 IfH 00 -J -J -^ Of -:^ -? Ol <l Or o zjx <» ;s X to QC il o g ^ 3J p o 1^ S ^ b^ c-3 < * ^ 3 < ?? «^…
Astronomy
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