Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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the obſervators ſtanding in
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Jupiter,
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make the ſelf ſame changes
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of Figure, that to us upon the Earth, the Moon doth make. </
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<
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>You
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ſee now how theſe three things, which at ſirſt ſeémed diſſonant,
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do admirably accord with the
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Copernican
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Syſteme. </
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<
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>Here alſo by
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the way may
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Simplicius
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ſee, with what probability one may
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clude, that the Sun and not the Earth, is in the Centre of the
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Planetary
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converſions. </
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<
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>And ſince the Earth is now placed
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mongſt mundane Bodies, that undoubtedly move about the Sun,
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to wit, above
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Mercury
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and
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Venus,
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and below
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Saturn, Jupiter,
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and
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Mars
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; ſhall it not be in like manner probable, and perhaps
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neceſſary to grant, that it alſo moveth round?</
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The
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Medicean
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Stars areas it were
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four Moons about
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Jupiter.</
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>SIMP. </
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>Theſe accidents are ſo notable and conſpicuous, that
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it is not poſſible, but that
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Ptolomy
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and others his Sectators, ſhould
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have had knowledge of them, and having ſo, it is likewiſe
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ſary, that they have found a way to render reaſons of ſuch, and
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ſo ſenſible appearances that were ſufficient, and alſo congruous
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and probable, ſeeing that they have for ſo long a time been
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ceived by ſuch numbers of learned
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The Principal
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ſcope of
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mers, is to give a
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reaſon of
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ances.
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<
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>SALV. </
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<
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>You argue very well; but you know that the principal
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ſcope of
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Aſtronomers,
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is to render only reaſon for the appearances
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in the Cæleſtial Bodies, and to them, and to the motions of the
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Stars, to accomodate ſuch ſtructures and compoſitions of Circles,
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that the motions following thoſe calculations, anſwer to the ſaid
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appearances, little ſcrupling to admit of ſome exorbitances, that
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indeed upon other accounts they would much ſtick at. </
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Co-
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pernic us
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himſelf writes, that he had in his firſt ſtudies reſtored the
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Science of
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Aſtronomy
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upon the very ſuppoſitions of
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Ptolomy,
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and
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in ſuch manner corrected the motions of the Planets, that the
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computations did very exactly agree with the
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Phænomena,
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and
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the
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Phænomena
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with the ſupputations, in caſe that he took the
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Planets ſeverally one by one. </
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<
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>But he addeth, that in going
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bout to put together all the ſtructures of the particular Fabricks,
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there reſulted thence a Monſter and
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Chimæra,
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compoſed of
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bers moſt diſproportionate to one another, and altogether
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patible; So that although it ſatisfied an
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Aſtronomer
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meerly
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rithmetical,
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yet did it not afford ſatisfaction or content to the
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Aſtronomer Phyloſophical.
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And becauſe he very well
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ſtood, that if one might ſalve the Cæleſtial appearances with falſe
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aſſumptions in nature, it might with much more eaſe be done by
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true ſuppoſitions, he ſet himſelf diligently to ſearch whether
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ny amongſt the antient men of fame, had aſcribed to the World
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any other ſtructure, than that commonly received by
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Ptolomy
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;
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and finding that ſome
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Pythagoreans
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had in particular aſſigned
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the Diurnal converſion to the Earth, and others the annual
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tion alſo, he began to compare the appearances, and </
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