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Abd Salam Shabeeny 「An Account of Timbuctoo and Housa Territories in the Interior of Africa」
...All these threeclasses of binary systems are now known to be very numerous...
E. Walter Maunder 「Are the Planets Inhabited?」
...Campbell estimates that fully one star in six is a spectroscopic binary...
E. Walter Maunder 「Are the Planets Inhabited?」
...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 double star 61 Cygni—one of the nearest to our system—is believedto be a binary the components of which move in an orbit of more spaciousdimensions than that of any other known revolving pair...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...Other binary stars have had different periods assigned tothem; eleven pairs have been computed to revolve round each other inless than fifty years, and fifteen in less than 100 but more than fifty...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...In the usual construction of a triple system,the secondary star of a binary is resolvable into two, each star beingin mutual revolution, whilst they both gravitate round their primary...
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」
...The spectroscope shows that the brighter of these stars isagain a binary system of two huge suns, the components revolving aroundeach other in a period of about twenty days...
Cecil G. Dolmage 「Astronomy of To-day」
...The period ofthis binary appears to be about 540 years...
Richard A. Proctor 「Half-hours with 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」
...Much more interesting, however, is 70, a binary whosecomponents have completed a revolution since theirdiscovery by Sir William Herschel, the period beingninety-five years...
Garrett Serviss 「Pleasures of the telescope」
...Its near neighbor, Σ 2054, maybe a binary...
Garrett Serviss 「Pleasures of the telescope」
...It is regarded as a binary of long and as yetunascertained period...
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 is a binary with a period of revolution ofabout sixty years, and is interesting as the first binarystar whose orbit was determined...
Garrett Serviss 「Pleasures of the telescope」
...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」
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