Recreations in astronomy : with directions for practical experiments and telescopic work (1879)
Warren, Henry White, 1831-1912 · New York : Harper & Brothers · leaf 144
metimes one tail, sometimes half adozen. These follow the comet to perihelion, and pre-cede it afterward (Fig. 52). The orbits of some cometsare enormously elongated; one end may lie inside theearths orbit, and the other end be as far beyond Nep-tune as that is from the sun. Of course only a… … Fig. 52.—Aspects of Remarkable Comets. or one that will carry it off into infinite space, never toreturn. One rate of speed on the curve indicates anelliptical orbit that returns; a greater rate of speed in-dicates that it will take a parabolic orbit, which nevertuns. The exact rate of speed is…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
