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Abd Salam Shabeeny 「An Account of Timbuctoo and Housa Territories in the Interior of Africa」
...So we find parallax, proper motion, doublestars, binary systems, variable stars, and new stars all bound together...
George Forbes 「History of Astronomy」
...While the stars in general appear to travel independently of one another, except when they are combined in binary or trinary systems, there are notable exceptions to this rule...
Garrett Serviss 「Curiosities of the Sky」
...This has been actually shownto be true in many binary stars; it is believed to be true in all...
Robert Stawell Ball 「The Story of the Heavens」
...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」
...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」
...By means of the spectroscope Capella is shown to be really composed oftwo stars (one about twice as bright as the other) situated very closetogether and forming a binary system...
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」
...It is apparentlya binary, and if so will some time widen again,but its period is unknown...
Garrett Serviss 「Pleasures of the telescope」
...We begin our attack with the five-inchon Σ 1932, but not too confident that we shall come offvictors, for this binary has been slowly closing for manyyears...
Garrett Serviss 「Pleasures of the telescope」
...The first named is a binary whoseperiod has not been definitely ascertained...
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」
...The tenth-magnitude staris a binary of short period (probably less than fifty years),the distance of whose components was 2" in 1859, 1" in1880, 0...
Garrett Serviss 「Pleasures of the telescope」
...It is a slow binary of magnitudes fourand four, distance 3...
Garrett Serviss 「Pleasures of the telescope」
...The star is, nodoubt, a binary...
Garrett Serviss 「Pleasures of the telescope」
...The constellation Eridanus, represented in ,contains a few fine double stars, one of the most interestingof which is 12, a rather close binary...
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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