Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 250
luminated at night ? 440. If we want simply to measure the angular dis-tance of one celestial hody from another, what do we use ? Generally speaking,what else is to he determined ? 441. What is used when we wish to determinepositions on the visihle portion of the sky ? 442. Descrihe the altazimuth… … Fig. 99.—Portable Altazimuth. make it travel along a vertical circle, and the circle at-tached to the telescope will give us the zenith-distances 244 ASTRONOMICAL INSTRUMENTS. of the stars (or the altitude), which, in this case, will lie intwo azimuths 180° apart. Fig. 99 represents a portable…
Astronomy
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