Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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31 - 60
61 - 90
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241 - 270
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421 - 450
451 - 480
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proach towards the
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Æquilibrium,
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the incurvation of the arches
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of the courſes on the contrary ſhall, by degrees, increaſe.</
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A concipt that
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came ſuddenly
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to the minde of
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the Academian
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Lyncæus
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ing the great
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ſequence that
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lowed upon the
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tion of the Solar
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ſpots.
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Extravagant
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tations to be
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ved in the motions
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of the ſpots,
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ſeen by the
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demick, in caſe
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the Earth had the
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annual motion.
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>SAGR. </
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>I confeſſe,
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Salviatus,
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that to interrupt you in your
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Diſcourſe is ill manners, but I eſteem it no leſſe rudeneſs to
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mit you to run on any farther in words, whilſt they are, as the
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ſaying is, caſt into the air: for, to ſpeak freely, I know not how
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to form any diſtinct conceit of ſo much as one of theſe
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ons, that you have pronounced; but becauſe, as I thus
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ly and confuſedly apprehend them, they hold forth things of
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mirable conſequence, I would gladly, ſome way or other, be
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made to underſtand the ſame.</
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>SALV. </
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>The ſame that befalls you, befell me alſo, whilſt my
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Gueſt tranſported me with bare words; who afterwards aſſiſted
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my capacity, by deſcribing the buſineſſe upon a material
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ment, which was no other than a ſimple Sphere, making uſe of
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ſome of its circles, but to a different purpoſe from that, to which
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they are commonly applied. </
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<
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>Now I will ſupply the defect of
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the Sphere, by drawing the ſame upon a piece of paper, as need
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ſhall require. </
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>And to repreſent the firſt accident by me
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ded, which was, that the courſes or journeys of the ſpots, twice
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a year, and no more, might be ſeen to be made in right lines, let
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us ſuppoſe this point O [
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in Fig.
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4.] to be the centre of the grand
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Orb, or, if you will, of the Ecliptick, and likewiſe alſo of the
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Globe of the Sun it ſelf; of which, by reaſon of the great
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ſtance that is between it and the Earth, we that live upon the
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Earth, may ſuppoſe that we ſee the one half: we will therefore
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deſcribe this circle A B C D about the ſaid centre O, which
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ſenteth unto us the extream term that divideth and ſeparates the
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Hemiſphere of the Sun that is apparent to us, from the other that
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is occult. </
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<
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>And becauſe that our eye, no leſſe than the centre of
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the Earth, is underſtood to be in the plane of the Ecliptick, in
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which is likewiſe the centre of the Sun, therefore, if we ſhould
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fancy to our ſelves the body of the Sun to be cut thorow by the
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ſaid plane, the ſection will appear to our eye a right line, which
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let be B O D, and upon that a perpendicular being let fall AOC,
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it ſhall be the Axis of the ſaid Ecliptick, and of the annual
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tion of the Terreſtrial Globe. </
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<
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>Let us next ſuppoſe the Solar body
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(without changing centre) to revolve in it ſelf, not about the
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Axis A O C (which is the erect Axis upon the plane of the
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cliptick) but about one ſomewhat inclined, which let be this
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E O I, the which fixed and unchangeable Axis maintaineth it ſelf
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perpetually in the ſame inclination and direction towards the
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ſame points of the Firmament, and of the Univerſe. </
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<
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>And
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cauſe, in the revolutions of the Solar Globe, each point of its
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perficies (the Poles excepted) deſcribeth the circumference of a </
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