Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 419
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… … Fio. 107.—OKBrr op halleys comet. ORBITS OF COMETS. 399 w 1^ S P s B <iS S ^, !2! o o bs U m jL 0 o ft CJ so FT JD ? s <* •? ? g .-5 g fir o ^ fcS CO t-* cs c» on ?c 00 A t-l OS o c- 1-^ O o *> I-* H^ to l-» h-^ 1-1 CO I^fi fe h-1 » Ol o CO lO t-* o:!<l 300cogs O _, g o M o 0 oo -3 B So…
Astronomy
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