Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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481 - 510
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remotiores, in minori circulo feruntur? [ſcilicet:]
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Why are
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thoſe near the Æquinoctial carried about in a greater circle, and
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thoſe which are remote in a leſſer?</
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<
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>SALV. </
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<
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>To imitate the ſtarry Sphere, in which thoſe neareſt
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to the Æquinoctial, move in greater circles, than the more
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mote.</
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<
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>SIMP.
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Quarè Pila eadem ſub Æquinoctiali tota circa centrum
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terr æ, ambitu maximo, celeritate incredibili; ſub Polo verò circa
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centrum proprium, gyro nullo, tarditate ſupremâ volveretur?
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[That is:]
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Why is the ſame ball under the Æquinoctial wholly
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turned round the centre of the Earth in the greateſt
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rence, with an incredible celerity; but under the Pole about its
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own centre, in no circuite, but with the ultimate degree of
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dity?</
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<
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>To imitate the ſtars of the Firmament, that would do
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the like if they had the diurnal motion.</
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<
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>SIMP.
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Quare eadem res, pila v. </
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>g. </
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>plumbea, ſi ſemel terram
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circuivit, deſcripto circulo maximo, eandem ubique non
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migret ſecundùm circulum maximum, ſed tranſlata extra
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ctialem in circulis minoribus agetur? [Which ſpeaketh thus:]
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Why doth not the ſame thing, as for example, a ball of lead
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turn round every where according to the ſame great circle, if once
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deſcribing a great circle, it hath incompaſſed the Earth, but being
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removed from the Æquinoctial, doth move in leſſer circles?</
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<
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>SALV. </
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>Becauſe ſo would, nay, according to the doctrine of
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Ptolomey,
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ſo have ſome fixed ſtars done, which once were very
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near the Æquinoctial, and deſcribed very vaſt circles, and now that
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they are farther off, deſcribe leſſer.</
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<
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>SAGR. </
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>If I could now but keep in mind all theſe fine
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tions, I ſhould think that I had made a great purchaſe; I muſt
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needs intreat you,
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Simplicius,
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to lend me this Book, for there
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not chuſe but be a ſea of rare and ingenious matters contained in
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it.</
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>SIMP. </
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<
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>I will preſent you with it.</
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<
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<
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>Not ſo, Sir; I would not deprive you of it: but are
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the Queries yet at an end?</
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<
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>No Sir; hearken therefore.
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Si latio circularis
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vibus & levibus eſt naturalis, qualis eſt ea quæ fit ſecundùm
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am rectam? </
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>Nam ſi naturalis, quomodo & is motus qui circum est,
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naturalis eſt, cùm ſpecie differat à recto? </
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miſſile ignitum ſurſùm evolans ſcintilloſum caput ſurſùm à terrâ,
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non autem circum volvatur, &c. [Which take in our idiom:]
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If
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a circular lation is natural to heavy and light things, what is that
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which is made according to a right line? </
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<
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>For if it be natural, how
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then is that motion which is about the centre natural, ſeeing it </
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