...Later he said: “I adhere to the conviction thatProcyon and Sirius form real binary systems, consisting of a visible and aninvisible star... 
George Forbes 「History of Astronomy」
...The finest binary star in the northern heavens is Castor, the brighterof the two leading stars in the constellation Gemini...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...Our knowledge of binary star systems brings us to what may be regardedas the threshold of the fabric of the heavens...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...It is this very fact that elliptic motion is so common in the planets ofthe solar system which renders its discovery in binary stars of suchimportance...
Robert Stawell Ball 「The Story of the Heavens」
...Many double stars, for which this has not yetbeen done, are, however, believed to be, without doubt, binary...
Cecil G. Dolmage 「Astronomy of To-day」
...It is only in the case of binary systems that we can discover the massesof stars at all...
Cecil G. Dolmage 「Astronomy of To-day」
...—In addition to thesethere is a certain further number of binary variables inwhich both components are bright and where the variationof brightness follows a very different course...
George C. Comstock 「A Text-Book of Astronomy」
...The components of this celebrated binary are both nearlyof the third magnitude, distance about 5...
Garrett Serviss 「Pleasures of the telescope」
...Not far distant is another binary, atpresent beyond our powers, η...
Garrett Serviss 「Pleasures of the telescope」
...It is thought highly probable that σ is a binary,but its period has simply been guessed at...
Garrett Serviss 「Pleasures of the telescope」
...This is a long-period binary, and notwithstandingthe closeness of its stars, our four-inch should separatethem when the seeing is fine...
Garrett Serviss 「Pleasures of the telescope」
...It is evidently a binary inrapid motion, as the distance changed from about a quarterof a second in 1881 to more than a second in 1894...
Garrett Serviss 「Pleasures of the telescope」
...It is, no doubt, a binary...
Garrett Serviss 「Pleasures of the telescope」
...It is notknown that they constitute a binary system, because nocertain evidence of motion has been obtained...
Garrett Serviss 「Pleasures of the telescope」
...It is regarded as a binary of long and as yetunascertained period...
Garrett Serviss 「Pleasures of the telescope」
...It is probablya binary...
Garrett Serviss 「Pleasures of the telescope」
...This star is a binary, butthe motion is slow...
Garrett Serviss 「Pleasures of the telescope」
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