Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 289
mples of coloreddoubles for a small telescope. 367. Stars Optically and Physically Double. — Stars maybe double in two ways, — optically or physically. In the firstcase they are merely approximated in line with each other, as 276 DOUBLE STARS. C§ 367 seen from the earth; in the second case, they… … Fi#. 76. —Double and Multiple Stars. a straight line and uniform; i.e., one of them drifts by the otherin a line which is perfectly straight. This is a simple conse-quence of the combination of their independent propermotions. If they are physically connected, we find on thecontrary that the…
Astronomy
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