Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 470
distinctionwhich we can make betweenbinary systems and ordinary double stars is founded onthe presence or absence of observed motion. It is prob-able that nearly all the double stars are really binary sys-tems, but that many thousands of years are required toperform a revolution, so that the motion… … Fig. 124.—POSITION-ANGLE OP ADOUBLE STAR. 453 . A8TR0N0MT. its scope, and may therefore be regarded as a universalproperty of matter. Colors of Double Stars.—There are a few noteworthy statisticsin regard to the colors of the components of double stars whichmay be given. Among 596 of the brighter…
Astronomy
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