Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
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421 - 450
451 - 480
481 - 510
511 - 540
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>291</
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>175</
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>5419</
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>250</
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>Let us come to the fourth working, and the reſt with the ſame
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rule, and with the chords and ſines found out by the Authour
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himſelf; in this the Parallax is 14
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m. </
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<
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>prim.
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and the height found
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leſſe than 10 ſemidiameters, and diminiſhing the Parallax from
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14
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min.
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to 4
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min.
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yet nevertheleſſe you ſee that the ſtar doth not
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elevate full 31 ſemidiameters. </
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<
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>Therefore 10
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min.
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in 14
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min.
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doth
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not
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>Chord</
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>
<
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>8142</
cell
>
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>Angles</
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>B D C</
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>Sine</
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<
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>43235</
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>
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>B C D</
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<
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>Sine</
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<
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>407</
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>
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<
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>8142</
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<
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>86470</
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<
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>172940</
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<
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<
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>43235</
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<
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<
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>345880</
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<
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>30</
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<
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<
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>116</
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>3520</
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<
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>19370</
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</
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<
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<
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>4</
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>In the fifth operation of the Authour we have the ſines and the
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chord as you ſee, and the Parallax is 0
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gr. </
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<
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>42 m. </
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>30 ſec.
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which
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rendereth the height of the ſtar about 4 ſemidiameters, and
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recting the Parallax, with reducing it from 0
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gr. </
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<
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>42 m. </
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>
<
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>30 ſec.
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type
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<
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to 0
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gr. </
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<
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>5 m.
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onely, doth not ſuffice to raiſe it to ſo much as 28
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midiameters, the correction therefore of 0
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gr. </
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<
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>37 m. </
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<
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>30 ſec.
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is
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too
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