Galilei, Galileo
,
The systems of the world
,
1661
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<
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>SIMPL. </
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<
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>It may, in caſe the Ship were incorruptible, but the
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Ship decaying, the Navigation muſt of neceſſity come to an end.</
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<
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>SALV. </
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<
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>But in the Mediterrane, though the Veſſel were
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ruptible, yet could ſhe not ſail perpetually towards
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Paleſtina,
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that
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Voyage being determined. </
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<
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>Two things then are required, to the
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end a moveable may without intermiſſion move perpetually; the
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one is, that the motion may of its own nature be indeterminate and
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infinite; the other, that the moveable be likewiſe incorruptible
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and eternal.</
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Two things
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quiſite to the end a
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motion may
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petuate it ſelf; an
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unlimited ſpace,
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and an
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ble moveable.
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</
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<
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>SIMPL. </
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<
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>All this is neceſſary.</
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<
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>SALV. </
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<
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>Therefore you may ſee how of your own accord you
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have confeſſed it impoſſible that any moveable ſhould move
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nally in a right line, in regard that right motion, whether it be
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<
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wards, or downwards, is by you your ſelf bounded by the
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ference and centre; ſo that if a Moveable, as ſuppoſe the Earth
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be eternal, yet foraſmuch as the right motion is not of its own
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ture eternall, but moſt ^{*}terminate, it cannot naturally ſuit with
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<
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the Earth. </
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<
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>Nay, as was ſaid ^{*} yeſterday,
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Ariſtotle
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himſelf is
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conſtrained to make the Terreſtrial Globe eternally immoveable.
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</
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<
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>When again you ſay, that the parts of the Earth evermore move
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downwards, all impediments being removed, you egregiouſly
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vocate; for then, on the other ſide they muſt be impeded,
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ried, and forced, if you would have them move; for, when they
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are once fallen to the ground, they muſt be violently thrown
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wards, that they may a ſecond time fall; and as to the
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ments, theſe only hinder its arrival at the centre; but if there were
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a
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Well,
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that did paſſe thorow and beyond the centre, yet would not
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a clod of Earth paſſe beyond it, unleſſe inaſmuch as being
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ported by its
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impetus,
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it ſhould paſſe the ſame to return thither
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gain, and in the end there to reſt. </
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<
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>As therefore to the defending,
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that the motion by a right line doth or can agree naturally neither
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to the Earth, nor to any other moveable, whil'ſt the Univerſe
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taineth its perfect order, I would have you take no further paines
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bout it, but (unleſſe you will grant them the circular motion)
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your beſt way will be to defend and maintain their immobility.</
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Right motion
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cannot be eternal,
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and conſequently
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cannot be natural
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to the Earth.
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</
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* Terminatiſſimo.</
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<
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* By this
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on he every where
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means the
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ding Dialogue, or
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<
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Giornata.
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</
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</
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<
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<
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>SIMPL. </
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>
<
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>As to their immoveableneſſe, the arguments of
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ſtotle,
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and moreover thoſe alledged by your ſelf ſeem in my
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on neceſſarily to conclude the ſame, as yet; and I conceive it will
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be a hard matter to refute them.</
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<
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>SALV. </
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>
<
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>Come we therefore to the ſecond Argument, which was,
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That thoſe bodies, which we are aſſured do move circularly, have
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more than one motion, unleſſe it be the
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Primum Mobile
<
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; and
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therefore, if the Earth did move circularly, it ought to have two
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motions; from which alterations would follow in the riſing and
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ſetting of the Fixed Stars: Which effect is not perceived to enſue. </
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