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 291
of one, that it is possible to determine their orbits withsome accuracy. The case of Sirius is peculiar. Nearly forty years ago it had beenfound from meridian-circle observations to be moving, for no assign- 278 SIZE OF THE ORBITS. [§ 369 able reason, in a small orbit, with a period of about fifty… … not give ty^tt as muchlight as Sirius itself, has amass more than a quarterpart as great. It seems tobe one of Bessels darkstars. Fig. 77 represents Orbits of Binary Stars. the apparent orbifcs of twQ of the best determined double-star systems, Gamma Virginis and XiUrsse Majoris. £ Ursoe Majoris…
Astronomy
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