Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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things; and that motion where it is common, is as if it never
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were; and as you change not habitude to the Terreſtrial Poles
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(habitude I ſay, whether that they riſe, or deſcend) ſo neither
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ſhall you change poſition to the Poles imagined in Heaven;
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wayes provided that by Celeſtial Poles we underſtand (as hath
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been already defined) thoſe two points that come to be marked
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out by the prolongation of the Terreſtrial Axis unto that length.
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<
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>Tis true thoſe points in Heaven do change, when the Earths
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ſportment is made after ſuch a manner, that its Axis cometh to
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paſſe by other and other points of the immoveable Celeſtial
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Sphere, but our habitude thereunto changeth not, ſo as that the
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ſecond ſhould be more elevated to us than the firſt. </
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<
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>If any one
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will have one of the points of the Firmament, which do anſwer
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to the Poles of the Earth to aſcend, and the other to deſcend,
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he muſt walk along the Earth towards the one, receding from the
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other, for the tranſportment of the Earth, and with it us our
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ſelves, (as I told you before) operates nothing at all.</
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Motion where
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it is common, is as
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if it never were.
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>SAGR. </
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>Permit me, I beſeech you
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Salviatus,
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to make this a
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little more clear by an example, which although groſſe, is
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commodated to this purpoſe. </
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>Suppoſe your ſelf,
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Simplicius,
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to
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be aboard a Ship, and that ſtanding in the Poope, or Hin-deck;
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you have directed a Quadrant, or ſome other Aſtronomical
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ſtrument, towards the top of the Top-gallant-Maſt, as if you
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would take its height, which ſuppoſe it were
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v. </
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<
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>gr.
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40. degrees,
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there is no doubt, but that if you walk along the ^{*} Hatches
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wards the Maſt 25. or 30. paces; and then again direct the ſaid
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Inſtrument to the ſame Top-Gallant-Top. </
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<
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>You ſhall find its
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vation to be greater, and to be encreaſed
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v. </
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<
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>gr.
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10. degrees; but
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if inſtead of walking thoſe 25. or 30. paces towards the Maſt,
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you ſtand ſtill at the Sterne, and make the whole Ship to move
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thitherwards, do you believe that by reaſon of the 25. or 30.
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paces that it had paſt, the elevation of the Top-Gallant-Top
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would ſhew 10. degrees encreaſed?</
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An example
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ted to prove that
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the altitude of the
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Pole ought not to
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vary by means of
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the Earths annual
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motion.
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*
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Corſia,
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the bank
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or bench on which
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ſlaves ſit in a
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ly.</
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<
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>SIMP. </
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>I believe and know that it would not gain an hairs
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breadth in the paſſing of 30. paces, nor of a thouſand, no nor of
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an hundred thouſand miles; but yet I believe withal that
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ing through the ſights at the Top and Top-Gallant, if I ſhould
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find a fixed Star that was in the ſame elevation, I believe I ſay,
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that, holding ſtill the Quadrant, after I had ſailed towards the
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ſtar 60. miles, the eye would meet with the top of the ſaid
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Maſt, as before, but not with the ſtar, which would be
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ted to me one degree.</
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<
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>SAGR. </
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<
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>Then you do not think that the ſight would fall upon
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that point of the Starry Sphere, that anſwereth to the direction
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of the Top-Gallant Top?</
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