Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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<
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>SALV. </
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<
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>You have good cauſe for your doubt: and when we
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come to treat of the other Motion, you ſhall ſee how far
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nicus
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excelled
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Ptolomey
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in clearneſs and ſublimity of wit, in that
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he ſaw what the other did not, I mean the admirable harmony
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wherein that Motion agreed with all the other Cœleſtial Bodies.
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<
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>But for the preſent we will ſuſpend this particular, and return to
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our firſt conſideration; touching which I will proceed to propoſe
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(begining with things more general) thoſe reaſons which ſeem to
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favour the mobility of the Earth, and then wait the anſwers which
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Simplicius
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ſhall make thereto. </
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>And firſt, if we conſider onely
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the immenſe magnitude of the Starry Sphere, compared to the
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ſmalneſs of the Terreſtrial Globe, contained therein ſo many
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lions of times; and moreover weigh the velocity of the motion
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which muſt in a day and night make an entire revolution thereof,
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I cannot perſwade my ſelf, that there is any man who believes it
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more reaſonable and credible, that the Cœleſtial Sphere turneth
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round, and the Terreſtrial Globe ſtands ſtill.</
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Why the diurnal
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motion more
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bably ſhould belong
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to the Earth, than
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to the reſt of the
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Vniverſe.
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<
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>SAGR. </
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>If from the univerſality of effects, which may in nature
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have dependence upon ſuch like motions, there ſhould
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ly follow all the ſame conſequences to an hair, aſwell in one
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theſis
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as in the other; yet I for my part, as to my firſt and general
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apprehenſion, would eſteem, that he which ſhould hold it more
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tional to make the whole Univerſe move, and thereby to ſalve the
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Earths mobility, is more unreaſonable than he that being got to
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the top of your Turret, ſhould deſire, to the end onely that he
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might behold the City, and the Fields about it, that the whole
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Country might turn round, that ſo he might not be put to the
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trouble to ſtir his head. </
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<
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>And yet doubtleſs the advantages would
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be many and great which the
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Copernican Hypotheſis
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is attended
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with, above thoſe of the
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Ptolomaique,
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which in my opinion
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ſembleth, nay ſurpaſſeth that other folly; ſo that all this makes
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me think that far more probable than this. </
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<
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>But haply
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Ariſtotle,
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Ptolomey,
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and
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Simplicius
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may find the advantages of their
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ſteme, which they would do well to communicate to us alſo, if
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any ſuch there be; or elſe declare to me, that there neither are or
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can be any ſuch things.</
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<
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>SALV. </
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<
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>For my part, as I have not been able, as much as I have
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thought upon it, to find any diverſity therein; ſo I think I have
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found, that no ſuch diverſity can be in them: in ſo much that I
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eſteem it to no purpoſe to ſeek farther after it. </
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<
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>Therefore
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ſerve: Motion is ſo far Motion, and as Motion operateth, by how
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far it hath relation to things which want Motion: but in thoſe
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things which all equally partake thereof it hath nothing to do, and
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is as if it never were. </
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<
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>And thus the Merchandiſes with which a
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ſhip is laden, ſo far move, by how far leaving
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London,
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they paſs </
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