The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 316
f this group are shownin Fig. 324. 294. Number of Comets.—The number of comets re-corded as visible to the naked eye since the birth of Christ ASTRONOMY. 2S9 is about five hundred, while about two hundred telescopiccomets have been observed since the invention of the tele-scope. The total number of… … Fig. 324. seen only when near their perihelion, and since it is probablethat the period of most of those which have been observedis reckoned by thousands of years (if, indeed, they everreturn at all), our observations must be continued for manythousand years before we have seen all which come…
Astronomy
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