Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 306
ly upon its real length, partly upon the distance of thecomet, and partly upon the direction of the axis of the tailwith reference to the line of vision. The longer the tail,the nearer the comet; and the more nearly at right anglesto the line of vision is the axis of the tail, the greater isthe… … 28o ASTRONOMY. The tail of a comet, when seen at all, is usually severalmillion miles in length; and in some instances the tail islong enough to reach across the orbit of the earth, or twiceas far as from the earth to the sun. The tails of comets are apparently hollow, and are some-times a million…
Astronomy
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