File:Astronomy for the use of schools and academies (1882) (14577799307).jpg

Identifier: astronomyforuseo00gill (find matches)
Title: Astronomy for the use of schools and academies
Year: 1882 (1880s)
Authors: Gillet, J. A. (Joseph Anthony), 1837-1908 Rolfe, W. J. (William James), 1827-1910
Subjects: Astronomy
Publisher: New York : Potter, Ainsworth, & Co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ss, but still less bril-liant than the prominences which blaze through it likecarbuncles. Generally this inner corona has a pretty uni-form height, forming a ring three or four minutes of arcin width, separated by a somewhat definite outline fromthe outer corona, which reaches to a much greater dis-tance, and is far more irregular in form. Usually there areseveral rifts, as they have been called, like narrow beams ofdarkness, extending from the very edge of the sun to theouter night, and much resembling the cloud-shadows whichradiate from the sun before a thunder-shower; but theedges of these rifts are frequently curved, showing them ASTRONOMY. 205 to be something else than real shadows. Sometimes thereare narrow bright streamers, as long as the rifts, or longer.These are often inclined, occasionally are even nearlytangential to the solar surface, and frequently are curved.On the whole, the corona is usually less extensive andbrilliant over the solar poles, and there is a recognizable
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Fig. 225. tendency to accumulations above the middle latitudes, orspot-zones; so that, speaking roughly, the corona shows adisposition to assume the form of a quadrilateral or four-rayed star, though in almost every individual case this formis greatly modified by abnormal streamers at some point orother. 203. The Corona as seen at Recent Eclipses.—The 206 ASTRONOMY, corona can be seen only at the time of a total eclipse ofthe sun, and then for only a few minutes. Its form variesconsiderably from one eclipse to another, and apparentlyalso during the same eclipse. At least, different observersat different stations depict the same corona under verydifferent forms. Fig. 225 represents the corona of 1857 as

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