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 241
traction of gravity forparticles on the convex edgeof the tram, to half thatamount for those on theinner edge. The spectrumis the same as that of thecomets head. Third, a few comets showtails of still a third type, —short, stubby brushes, vio-lently curved, and due tomatter on which the repul-sive… … 308. Unexplained and Anomalous Phenomena.—A curiousphenomenon, not yet explained, is the dark stripe which, in a
Astronomy
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