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 44
Motions to be distinguished ? By what are the Apparent Motions caused ? 66.What changes in the appearance of some stars does a powerful telescope pro-duce ? Give an account of Epsilon Lyrce. In what times will the members of this DOUBLE AND MULTIPLE STAES. 37 … small telescope, or opera-glass even, suffices to show itdouble, and a powerful instrument reveals the fact thateach star composing this double is itself double; hence itis known as the Double-double. Here, then, we havea system of four stars; the stars composing each pair,considered by themselves,…
Astronomy
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