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Abd Salam Shabeeny 「An Account of Timbuctoo and Housa Territories in the Interior of Africa」
...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 common centre of gravity of a binary system is situated on a linebetween both stars, and distant from each in inverse proportion to theirrespective masses...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...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'」
...the primary andsecondary of a binary system are each resolvable into two, forming twopairs, each pair being in mutual revolution, while they both gravitateround their common centre of gravity...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...One of the finest binary stars is that known as Castor, the brighter ofthe two principal stars in the constellation of Gemini...
Robert Stawell Ball 「The Story of the Heavens」
...A pairing of stars in this way, though often casually alluded toas a double star, is properly termed a "binary," or binary system...
Cecil G. Dolmage 「Astronomy of To-day」
...The method of detecting binary stars by means of the spectroscope is anapplication of Doppler's principle...
Cecil G. Dolmage 「Astronomy of To-day」
...,and their number is rapidly increasing, about one star out ofevery seven whose motion in the line of sight is determinedproving to be a binary or, as in the case of Polaris, possiblytriple...
George C. Comstock 「A Text-Book of Astronomy」
...The period of this binary seems to be about 750years...
Richard A. Proctor 「Half-hours with the Telescope」
...It is apparentlya binary, and if so will some time widen again,but its period is unknown...
Garrett Serviss 「Pleasures of the telescope」
...It is clearly a binary, with a longperiod...
Garrett Serviss 「Pleasures of the telescope」
...Itis believed to be a swiftly moving binary, whose stars arenever separated widely enough to be distinguished withcommon telescopes...
Garrett Serviss 「Pleasures of the telescope」
...It is regarded as a binary of long and as yetunascertained period...
Garrett Serviss 「Pleasures of the telescope」
...Sweeping a little way northward we comeupon an interesting binary, λ, which is unfortunately beyondthe dividing power of our largest glass...
Garrett Serviss 「Pleasures of the telescope」
...It is probablya binary...
Garrett Serviss 「Pleasures of the telescope」
...In 66 we find aswift binary whose components are at present far tooclose for any except the largest telescopes...
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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