Galilei, Galileo
,
The systems of the world
,
1661
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circle C I, the circumference ſhall be double to the circumference,
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and every arch of the greater circle double to every like arch of
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the leſſer; and conſequently, the half of the arch of the greater
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circle, equal to the whole arch of the leſſe. </
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<
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>And becauſe the
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gle C E I made in the centre E of the leſſer circle, and which
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ſteth upon the arch C I, is double the angle C A D, made in the
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centre A of the greater circle, to which the arch C D ſubtendeth;
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therefore the arch C D is half of the arch of the greater circle like
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to the arch C I, and therefore the two arches C D and C I are
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qual; and in the ſame manner we may demonſtrate of all their
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parts. </
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<
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>But that the buſineſs, as to the motion of deſcending grave
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bodies, proceedeth exactly thus, I will not at this time affirm; but
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this I will ſay, that if the line deſcribed by the cadent moveable
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be not exactly the ſame with this, it doth extream neerly reſemble
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the ſame.</
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<
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>SAGR. </
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>But I,
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Salviatus,
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am juſt now conſidering another
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ticular very admirable; and this it is; That admitting theſe
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ſiderations, the right motion doth go wholly ^{*} mounting, and that
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Nature never makes uſe thereof, ſince that, even that that uſe,
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which was from the beginning granted to it, which was of
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cing the parts of integral bodies to their place, when they were
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ſeparated from their whole, and therefore conſtituted in a
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ved diſpoſition, is taken from it, and aſſigned to the circular
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motion.</
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Right motion
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ſeemeth wholly
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cluded in nature.
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* Vadia del tutto a
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monte,
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rendered in
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the Latixe
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no peſſum eat.</
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<
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>SALV. </
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>This would neceſſarily follow, if it were concluded
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that the Terreſtrial Globe moveth circularly; a thing, which I
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pretend not to be done, but have onely hitherto attempted, as I
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ſhall ſtill, to examine the ſtrength of thoſe reaſons, which have
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been alledged by Philoſophers to prove the immobility of the
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Earth, of which this firſt taken from things falling
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larly, hath begat the doubts, that have been mentioned; which
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I know not of what force they may have ſeemed to
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Simplicius
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;
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and therefore before I paſſe to the examination of the remaining
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arguments, it would be convenient that he produce what he hath
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to reply to the contrary.</
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<
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>SIMP. </
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>As to this firſt, I confeſſe indeed that I have heard
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ſundry pretty notions, which I never thought upon before, and
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in regard they are new unto me, I cannot have anſwers ſo ready
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for them, but this argument taken from things falling
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cularly, I eſteem it not one of the ſtrongeſt proofs of the
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lity of the Earth; and I know not what may happen touching the
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ſhots of great Guns, eſpecially thoſe aimed contrary to the
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nal motion.</
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<
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>SAGR. </
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<
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>The flying of the birds as much puzzleth me as the
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objection of the Gun-ſhot, and all the other experiments above </
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