Astronomy for Schools And General Readers
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The eoma^ is the envelope immediately surrounding the nucleus. It usually shades off from it, so that no distinct line of separation can be seen. Frequently it is composed of a series of circular bands of light, as in the drawing on the following page, made from a * Latin for hair.
Digitized by VjOOQIC 190 ASTRONOMY, telescopic view, of Coggia's comet. The nucleus and coma together make up the head.
The iaU stretches out from the coma, growing fainter Fig. 46.— Oomia^s Ooxkt, 1874.
till entirel...y lost. It usually broadens as it recedes from the head. It also is extremely thin and rare. Even very faint stars can be seen through it. In the case of Digitized by VjOOQIC COMETS AND MEtEORS. 191 Fig. 46.— Donati^s Coxbt, 1868.
Digitized by VjOOQIC 192 ASTRONOMY.
the faint comets the tail is often not distinguishable at all, while in many of the brighter ones mentioned in history it stretched from the horizon to the zenith.
Thus, we have an account of a comet in the year 134 B.C. that "lasted seventy days; the heavens appeared all on fire ; the comet occupied a fourth part of the sky, and its brilliancy was superior to that of the sun; it took four hours to rise and four hours to set." Fig.
What to read after Astronomy for Schools And General Readers?
You can find similar books in the "Read Also" column, or choose other free books by Isaac Sharpless to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The eoma^ is the envelope immediately surrounding the nucleus. It usually shades off from it, so that no distinct line of separation can be seen. Frequently it is composed of a series of circular bands of light, as in the drawing on the following page, made from a * Latin for hair.
Digitized by VjOOQIC 190 ASTRONOMY, telescopic view, of Coggia's comet. The nucleus and coma together make up the head.
The iaU stretches out from the coma, growing fainter Fig. 46.— Oomia^s Ooxkt, 1874.
till entirel...y lost. It usually broadens as it recedes from the head. It also is extremely thin and rare. Even very faint stars can be seen through it. In the case of Digitized by VjOOQIC COMETS AND MEtEORS. 191 Fig. 46.— Donati^s Coxbt, 1868.
Digitized by VjOOQIC 192 ASTRONOMY.
the faint comets the tail is often not distinguishable at all, while in many of the brighter ones mentioned in history it stretched from the horizon to the zenith.
Thus, we have an account of a comet in the year 134 B.C. that "lasted seventy days; the heavens appeared all on fire ; the comet occupied a fourth part of the sky, and its brilliancy was superior to that of the sun; it took four hours to rise and four hours to set." Fig.
What to read after Astronomy for Schools And General Readers?
You can find similar books in the "Read Also" column, or choose other free books by Isaac Sharpless to read onlineMoreLess
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