Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 222
ervation,some double stars have made a complete revolutionabout one another, and in many cases sufficient move-ment has taken place for an accurate determinationof the period or time of revolution. The shortestperiod as yet found is about 5J years. There are aconsiderable number whose periods are… … Diag. LXXXII. the double stars observed by W. Struve, may be con-sidered as that of a typical double star whose compo-nents are fairly widely separated. The brighter star ofp 2 212 ASTRONOMY the pair at A is of magnitude 47, and of yellow colour;the companion is of magnitude 6*6, and is purple.The…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
