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 268
m;and even in very powerful telescopes they appear as merepoints of light, which can be distinguished from the starsonly by their motions. ASTRONOMY. 243 To facilitate the discovery of these bodies, very accuratemaps have been constructed, including all the stars down tothe thirteenth magnitude in… … Fig. 271. observer who is searching for these small planets will placein the field of view of his telescope six spider-lines at rightangles to each other, and at equal distances apart, in sucha manner that several small squares will be formed, embra-cing just as much of the heavens as do those…
Astronomy
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