Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 242
308. Unexplained and Anomalous Phenomena.—A curiousphenomenon, not yet explained, is the dark stripe which, in a … § 308] THE NATURE OF COMETS. 231 large comet approaching the sun, runs down the centre of thetail, looking very much as if it were a shadow of the cometshead. It is certainly not a shadow, however, because it usuallymakes more or less of an anglewith the suns direction. It iswell shown in Fig. 61.…
Astronomy
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