Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 416
pair of points, capable of being distin-guished as double only by the most perfect eye (without the tele-scope), is really composed of two pairsof stars wide apart, with a group ofsmaller stars between and aroundthem. The figure shows the appear-ance in a telescope of considerablepower. Revolutions… … Sun, else they would be drawn together FlG- 202.—The Quadruple . . i ° Star e Lyrje. as a single star. The method of determining the period of revolution of a pair ofstars, A and B, is illustrated by the figure, whLh is supposed to rep-resent the field of view of an inverting telescope pointed…
Astronomy
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