Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 420
421 - 450
451 - 480
481 - 510
511 - 540
541 - 570
571 - 600
601 - 630
631 - 660
661 - 690
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040/01/296.jpg
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276
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<
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<
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<
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>B D C</
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<
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<
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<
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<
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>6166</
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<
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<
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<
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>97987</
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<
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>587922</
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<
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<
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>24</
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<
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<
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>247</
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<
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>6041</
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<
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>87842</
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<
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<
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<
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>1103</
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>11</
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<
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>And bringing back the Parallax 0
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gr. </
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<
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>8 m. </
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<
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>30 ſec.
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to 7
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gr.
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7
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m.
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whoſe ſine is 204, the ſtar elevateth to 30 ſemidiameters or
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thereabouts; therefore the correction of 0
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gr. </
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<
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>1 mi. </
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<
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>30 ſec.
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doth
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not
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<
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>20</
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<
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<
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>204</
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<
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>6041</
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<
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>87342</
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<
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<
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>1965</
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<
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<
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<
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>12</
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<
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>Now let us ſee what correction is requiſite for the third
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ing made upon the obſervations of
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Hainzelius
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and
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Tycho,
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which
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rendereth the ſtar about 19 ſemidiameters high, with the
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rallax of 10
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m. </
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<
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>pri.
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The uſual angles and their ſines, and chord
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found by the Authour, are theſe next following; and they
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move the ſtar (as alſo in the Authours working) 19
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meters from the centre of the Earth. </
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<
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>It is neceſſary therefore for
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the raiſing of it, to diminiſh the Parallax according to the Rule
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which he likewiſe obſerveth in the ninth working. </
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>
<
s
>Let us
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fore ſuppoſe the Parallax to be 6
<
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type
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m. </
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<
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>prim.
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whoſe ſine is 175, and
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the diviſion being made, there is found likewiſe leſſe than 31
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ſemidiameters for the ſtars diſtance. </
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<
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>And therefore the
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on of 4
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min. </
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<
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>prim.
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is too little to ſerve the Authours
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