Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 354
larger star must be in the focus of the true relative orbitdescribed by the smaller ; and, moreover, that the latter mustdescribe around it equal areas in equal times. By the help ofthese principles, we can deduce from the apparent oval the trueorbital ellipse ; but the calculation is troublesome… … 270°>61 Cygni Fig. 114. — Orbits of Binary Stars. Fig. 114 represents the orbits of four of the best determined double-star systems. In but a few cases, where we have sufficient meridian-circle obser-vations, or where the two components of the pair have had theirposition and distance measured…
Astronomy · Constellations
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