Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Peripatetick
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loſophers condemn
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the Study of
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metry, and why.
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<
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>SIMP. </
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>To tell you true, I do not very well know; perhaps,
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becauſe I have not ſo much as learnt the reaſons that are by
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my
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produced, of thoſe effects, I mean of thoſe ſtations,
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dations, acceſſions, receſſions of the Planets; lengthenings and
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ſhortnings of dayes, changes of ſeaſons, &c. </
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>But omitting the
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conſequences that depend on the firſt ſuppoſitions, I find in the
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ſuppoſitions themſelves no ſmall difficulties; which ſuppoſitions,
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if once they be overthrown, they draw along with them the ruine
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of the whole fabrick. </
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<
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>Now foraſmuch as becauſe the whole
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module of
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Copernicus
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ſeemeth in my opinion to be built upon
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firm foundations, in that it relyeth upon the mobility of the earth,
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if this ſhould happen to be diſproved, there would be no need of
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farther diſpute. </
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<
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>And to diſprove this, the Axiom of
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Ariſtotle
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is in my judgment moſt ſufficient, That of one ſimple body,
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one ſole ſimple motion can be natural: but here in this caſe, to
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the Earth, a ſimple body, there are aſſigned 3. if not 4. motions,
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and all very different from each other. </
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motion, as a grave body towards its centre, which cannot be
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nied it, there is aſſigned to it a circular motion in a great circle
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about the Sun in a year, and a vertiginous converſion about its
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own centre in twenty four hours. </
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<
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>And that in the next place
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which is more exorbitant, & which happly for that reaſon you paſs
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over in ſilence, there is aſcribed to it another revolution about
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its own centre, contrary to the former of twenty four hours,
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and which finiſheth its period in a year. </
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>In this my
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ing apprehendeth a very great
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Four ſeveral
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motions aſſigned to
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the Earth.
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The motion of
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deſcent belongs not
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to the terreſtrial
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Globe, but to its
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parts.
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<
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>SALV. </
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<
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>As to the motion of deſcent, it hath already been
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cluded not to belong to the Terreſtrial Globe which did never
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move with any ſuch motion, nor never ſhall do; but is (if there be
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ſuch a thing) that propenſion of its parts to reunite themſelves
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to their whole. </
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>As, in the next place, to the Annual motion, </
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and the Diurnal, theſe being both made towards one way, are
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very compatible, in the ſame manner juſt as if we ſhould let a
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Ball trundle downwards upon a declining ſuperficies, it would in
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its deſcent along the ſame ſpontaneouſly revolve in it ſelf. </
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<
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>As
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to the third motion aſſigned it by
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Copernicus,
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namely about it
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ſelf in a year, onely to keep its Axis inclined and directed
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towards the ſame part of the Firmament, I will tell you a thing
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worthy of great conſideration: namely
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ut tantum abeſt
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(although
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it be made contrary to the other annual) it is ſo far from having
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any repugnance or difficulty in it, that naturally and without any
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moving cauſe, it agreeth to any whatſoever ſuſpended and
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ted body, which if it ſhall be carried round in the circumference
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of a circle, immediate of it ſelf, it acquireth a converſion about
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its own centre, contrary to that which carrieth it about, and of </
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