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
one of the mostinteresting. What appearsto the unaided eye as a singleluminous point, is shown bya powerful telescope to con-sist of seven stars, arranged as shown in Fig. 20. 68. More than 6,000 double stars are now known, innearly 700 of which a regular orbital motion, and in someof them a very… … Fig. 20. -The Multiple Stab,0 Orionis. system complete their revolution ? 67. Describe Theta Orionis, as seen througha powerful telescope. 68. How many double stars are now known ? In howmany of these has an orbital motion been detected ? How do the double stars 38 THE STAES. In some cases the…
Astronomy
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