Galilei, Galileo
,
The systems of the world
,
1661
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Power, or by ſome Angel, a very great Cannon bullet were
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ed up thither, and placed in our Zenith or vertical point, and from
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thence let go at liberty, it is in his, and alſo in my opinion, a moſt
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incredible thing that it, in deſcending downwards, ſhould all the
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way maintain it ſelf in our vertical line, continuing to turn round
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with the Earth, about its centre, for ſo many dayes, deſcribing
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under the Equinoctial a Spiral line in the plain of the great circle
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it ſelf: and under other Parallels, Spiral lines about Cones, and
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under the Poles falling by a ſimple right line. </
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>He, in the next
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place, ſtabliſheth and confirmeth this great improbability by
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ving, in the way of interrogations, many difficulties impoſſible to
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be removed by the followers of
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Copernicus
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; and they are, if I do
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well remember-----.</
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The firſt
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ction of the
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dern Author of
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the little tract of
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Concluſions.</
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A Cannon
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let would ſpend
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more than ſix days
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in falling from the
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Concave of the
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Moon to the
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tre of the Earth,
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according to the
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pinion of that
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dern Author of the
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Concluſions.</
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>SALV. </
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>Take up a little, good
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Simplicius,
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and do not load me
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with ſo many novelties at once: I have but a bad memory, and
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therefore I muſt not go too faſt. </
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>And in regard it cometh into
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my minde, that I once undertook to calculate how long time ſuch a
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grave body falling from the concave of the Moon, would be in
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paſſing to the centre of the Earth, and that I think I remember
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that the time would not be ſo long; it would be fit that you ſhew
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us by what rule this Author made his calculation.</
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>SIMP. </
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>He hath done it by proving his intent
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à fortiori,
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a
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cient advantage for his adverſaries, ſuppoſing that the velocity of
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the body falling along the vertical line, towards the centre of the
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Earth, were equal to the velocity of its circular motion, which it
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made in the grand circle of the concave of the Lunar Orb.
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>Which by equation would come to paſſe in an hour, twelve
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ſand ſix hundred German miles, a thing which indeed ſavours of
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impoſſibility: Yet nevertheleſſe, to ſhew his abundant caution,
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and to give all advantages to his adverſaries, he ſuppoſeth it for
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true, and concludeth, that the time oſ the fall ought however to
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be more than ſix dayes.</
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>SALV. </
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>And is this the ſum of his method? </
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>And doth he by
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this demonſtration prove the time of the fall to be above ſix
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dayes?</
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<
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>SAGR. </
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>Me thinks that he hath behaved himſelf too modeſtly,
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for that having it in the power of his will to give what velocity he
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pleaſed to ſuch a deſcending body, and might aſwell have made it
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ſix moneths, nay, ſix years in falling to the Earth, he is content
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with ſix dayes. </
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>But, good
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Salviatus,
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ſharpen my appetite a
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tle, by telling me in what manner you made your computation, in
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regard you ſay, that you have heretofore caſt it up: for I am
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fident that if the queſtion had not required ſome ingenuity in
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working it, you would never have applied your minde unto
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it.</
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