Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ties of the Planets motions, with theſe two new ſuppoſitions, all
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which things jumpt exactly with his purpoſe; and ſeeing the whole
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correſpond, with admirable facility to its parts, he imbraced this
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new Syſteme, and it took up his reſt.</
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Copernicus
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ſtored Aſtronomy
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upon the
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ous of
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Ptolomy:</
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What moved
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pernicus
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to
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bliſh his Syſteme.
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>SIMP. </
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>But what great exorbitancies are there in the
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maick
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Syſteme, for which there are not greater to be found in this
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of
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Copernicus
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?</
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<
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>SALV. </
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>In the
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Ptolomaick Hypotheſis
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there are diſeaſes, and in
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the
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Copernican
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their cures. </
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>And firſt will not all the Sects of
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Phyloſophers,
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account it a great inconvenience, that a body
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turally moveable in circumgyration, ſhould move irregularly upon
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its own Centre, and regularly upon another point? </
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>And yet
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there are ſuch deformed motions as theſe in the
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Ptolomæan
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theſis, but in the
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Copernican
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all move evenly about their own
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Centres. </
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>In the
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Ptolomaick,
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it is neceſſary to aſſign to the
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leſtial bodies, contrary motions, and to make them all to move,
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from Eaſt to Weſt, and at the ſame time, from Weſt to Eaſt;
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But in the
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Copernican,
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all the Cæleſtial revolutions are towards
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one onely way, from Weſt to Eaſt. </
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>But what ſhall we ſay of
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the apparent motion of the Planets, ſo irregular, that they not
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ly go one while ſwift, and another while ſlow, but ſometimes
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wholly ſeace to move; and then after a long time return back
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gain? </
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>To ſalve which appearances
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Ptolomie
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introduceth very great
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Epicicles,
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accommodating them one by one to each Planet, with
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ſome rules of incongruous motions, which are all with one
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gle motion of the Earth taken away. </
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>And would not you,
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plicius,
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call it a great abſurditie, if in the
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Ptolomaick
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ſis, in which the particular Planets, have their peculiar Orbs
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ſigned them one above another, one muſt be frequently forced
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to ſay, that
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Mars,
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conſtituted above the Sphære of the Sun, doth
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ſo deſcend, that breaking the Solar Orb, it goeth under it, and
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approacheth neaer to the Earth, than to the Body of the Sun,
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and by and by immeaſurably aſcendeth above the ſame? </
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<
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>And
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yet this, and other exorbitancies are remedied by the Soul and
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fingle annual motion of the Earth.</
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Inconveniencies
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that are in the
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ſteme of
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Ptolomy.</
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<
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>SAGR. </
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>I would gladly be bettter informed how theſe ſtations,
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and retrograde and direct motions, which did ever ſeem to me
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great improbalities, do accord in this
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Copernican
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Its a great
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gument in favour
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of
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Copernicus,
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that
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he obviates the
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tions &
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tions of the motions
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of the Planets.
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<
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>SALV. </
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<
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>You ſhall ſee them ſo to accord,
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Sagredus,
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that
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this onely conjecture ought to be ſufficient to make one that
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is not more than pertinacious or ſtupid, yield, aſſent to all the
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reſt of this Doctrine. </
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<
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>I tell you therefore, that nothing being
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altered in the motion of
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Saturn,
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which is 30 years, in that
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of
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Jupiter,
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which is 12, in that of
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Mars,
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which is 2, in that of
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Venus,
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which is 9. moneths, in that of
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Mercury,
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which is 80. </
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