A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 507
es nowknown, y Andromedse and/3 Cygni are fine examplesfor a small telescope. 868. Measurement ofDouble Stars.— Such meas-ures are generally madewith a filar position-mi-crometer, essentially suchas shown in Figs. 28 and29 (Art. 73). The quan-tities to be determined arethe distance and… … Fig. 227. Measurement of Distance and Position-Angle of a DoubleStar. DISTINGUISHING DOUBLE STARS. 495 by the line drawn from the larger star to the smaller, reckoning aroundfrom the north through the east, as shown in Fig. 227. Photography may also be used, and promises to become a favorite…
Astronomy
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