Galilei, Galileo
,
The systems of the world
,
1661
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holdeth faſt ſuch a multitude of Stars, which without ever
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ing fite among themſelves, are with ſo much concord carried
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bout, with ſo great diſparity of motions. </
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<
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>Or elſe, ſuppoſing the
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Heavens to be fluid, as we are with more reaſon to believe, ſo
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as that every Star wandereth to and fro in it, by wayes of its
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own, what rules ſhall regulate their motions, and to what
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poſe, ſo, as that being beheld from the Earth, they appear as if
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they were made by one onely Sphere? </
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<
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>It is my opinion, that they
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might ſo much more eaſily do that, and in a more commodious
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manner, by being conſtituted immoveable, than by being made
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errant, by how much more facile it is to number the quarries in the
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Pavement of a
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Piazza,
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than the rout of boyes which run up and
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down upon them. </
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<
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>And laſtly, which is the ſeventh inſtance, if
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we atribute the Diurnal Motion to the higheſt Heaven, it muſt be
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conſtituted of ſuch a force and efficacy, as to carry along with
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it the innumerable multitude of fixed Stars, Bodies all of vaſt
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magnitude, and far bigger than the Earth; and moreover all the
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Spheres of the Planets; notwithſtanding that both theſe and thoſe
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of their own nature move the contrary way. </
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<
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>And beſides all this,
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it muſt be granted, that alſo the Element of Fire, and the
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er part of the Air, are likewiſe forcibly hurried along with the
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reſt, and that the ſole little Globe of the Earth pertinaciouſly
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ſtands ſtill, and unmoved againſt ſuch an impulſe; a thing, which
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in my thinking, is very difficult; nor can I ſee how the Earth, a
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pendent body, and equilibrated upon its centre, expoſed
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ferently to either motion or reſt, and environed with a liquid
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bient,
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ſhould not yield alſo as the reſt, and be carried about.
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<
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>But we find none of theſe obſtacles in making the Earth to move;
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a ſmall body, and inſenſible, compared to the Univerſe, and
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therefore unable to offer it any violence.</
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A third
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mation of the ſame
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Doctrine.
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The greater Orbs
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make their
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ſions in greater
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times.
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The times of the
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Medicean
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Planets
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converſions.
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The motion of
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24
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hours aſcribed
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to the higheſt
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Sphere diſorders
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the period of the
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inferiour.
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The fourth
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firmation.
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Great diſparity
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amongſt the
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ons of the
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lar fixed ſtars, if
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their Sphere be
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moveable.
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The fifth
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firmation.
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The motions of
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the fixed ſtars
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would accelerate
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and grow ſlow in
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divers times, if the
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ſtarry Sphere were
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moueable.
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The ſixth
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firmatiox.
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The Seventh
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firmation.
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The Earth a
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pendent Body, and
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equilibrated in a
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fluid
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Medium
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ſeems unable to
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reſiſt the rapture
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of the Diurnal
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Motion.
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<
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>SAGR. </
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<
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>I find my fancy diſturbed with certain conjectures ſo
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fuſedly ſprung from your later diſcourſes; that, if I would be
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bled to apply my ſelf with atention to what followeth, I muſt of
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ceſſity attempt whether I can better methodize them, and gather
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thence their true conſtruction, if haply any can be made of them;
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and peradventure, the proceeding by interrogations may help me
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the more eaſily to expreſſe my ſelf. </
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<
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>Therefore I demand firſt of
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plicius,
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whether he believeth, that divers motions may
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ly agree to one and the ſame moveable body, or elſe that it be
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requiſite its natural and proper motion be onely one.</
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<
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>SIMPL. </
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<
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>To one ſingle moveable, there can naturally agree
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but one ſole motion, and no more; the reſt all happen
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tally and by participation; like as to him that walketh upon the
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Deck of a Ship, his proper motion is that of his walk, his motion
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by participation that which carrieth him to his Port, whither he </
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