Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Landgrave
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<
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>Polar altit.</
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>51</
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>Altit. of the Star</
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Gemma
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>The other two are theſe
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Buſchius.
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<
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>Polar Altitude</
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>51</
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>10</
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>Altit. of the Star</
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>79</
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>20</
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Gemma.
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Reinholdus.
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>Polar Altitude</
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>51</
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>18</
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<
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>Altit. of the Star</
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>79</
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>30</
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Gemma.
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>From what I have hitherto demonſtrated, you may gueſſe how
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much this firſt way of finding out the diſtance of the Star, and
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proving it ſublunary introduced by the Authour, maketh againſt
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himſelf, and how much more probably and clearly the diſtance
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thereof is collected to have been amongſt the more remote fixed
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Stars.</
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<
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>SIMP. </
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>As to this particular, I think that the inefficacy of the
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Authors demonftrations is very plainly diſcovered; But I ſee that all
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this was compriſed in but a few leaves of his Book, and it may be,
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that ſome other of his Arguments are more concluſive then theſe
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firſt.</
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<
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>SALV. </
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<
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>Rather they muſt needs be leſſe valid, if we will take
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thoſe that lead the way for a proof of the reſt: For (as it is clear)
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the uncertainty and inconcluſiveneſſe of thoſe, is manifeſtly
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ſerved to derive it ſelf from the errours committed in the
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mental obſervations, upon which the Polar Altitude, and height
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of the Star was thought to have been juſtly taken, all in effect
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having eaſily erred; And yet to find the Altitude of the Pole,
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ſtronomers have had Ages of time to apply themſelves to it, at their
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leaſure: and the Meridian Altitudes of the Star are eaſier to be
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obſerved, as being moſt terminate, and yielding the Obſervator
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ſome time to continue the ſame, in regard they change not ſenſibly,
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in a ſhort time, as thoſe do that are remote from the Meridian. </
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<
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>And
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if this be ſo, as it is moſt certain, what credit ſhall we give to
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lations founded upon Obſervations more numerous, more difficult
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to be wrought, more momentary in variation, and we may add,
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with Inſtruments more incommodious and erroneous? </
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<
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>Upon a
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ſlight peruſal of the enſuing demonſtrations, I ſee that the
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putations are made upon Altitudes of the Star taken in different
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Vertical Circles, which are called by the Arabick name,
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Azimuths
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; in
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which obſervations moveable inſtruments are made uſe of, not
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ly in the Vertical Circles, but in the Horizon alſo, at the ſame time;
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inſomuch that it is requiſite in the ſame moment that the altitude
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is taken, to have obſerved, in the Horizon, the diſtance of the </
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