Galilei, Galileo
,
The systems of the world
,
1661
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ſuch velocity, that they both finiſh one revolution in the ſame
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time preciſely. </
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<
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>You may ſee this admirable, and to our
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poſe accommodate experience, if putting in a Baſon of water a
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Ball that will ſwim; and holding the Baſon in your hand, you
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turn round upon your toe, for you ſhall immediatly ſee the Ball
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begin to revolve in it ſelf with a motion, contrary to that of the
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Baſon, and it ſhall finiſh its revolution, when that of the Baſon it
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ſhall finiſh. </
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>Now what other is the Earth than a penſil Globe
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librated in tenuous and yielding aire, which being carried
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bout in a year along the circumference of a great circle, muſt
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needs acquire, without any other mover, a revolution about its
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own centre, annual, and yet contrary to the other motion in like
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manner annual? </
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<
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>You ſhall ſee this effect I ſay, but if afterwards
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you more narrowly conſider it, you ſhall find this to be no real
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thing, but a meer appearance; and that which you think to be
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a revolution in it ſelf, you will find to be a not moving at all,
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but a continuing altogether immoveable in reſpect of all that
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which without you, and without the veſſel is immoveable: for if in
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that Ball you ſhall make ſome mark, and conſider to what part of
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the Room where you are, or of the Field, or of Heaven it is
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ſituate, you ſhall ſee that mark in yours, and the veſſels
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tion to look alwayes towards that ſame part; but comparing it to
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the veſſel and to your ſelf that are moveable, it will appear to go
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altering its direction, and with a motion contrary to yours, and
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that of the veſſel, to go ſeeking all the points of its
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tion; ſo that with more reaſon you and the baſon may be ſaid
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to turn round the immoveable Ball, than that it moveth round
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in the baſon. </
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>In the ſame manner the Earth ſuſpended and
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brated in the circumference of the Grand Orbe, and ſcituate in
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ſuch ſort that one of its notes, as for example, its North Pole,
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keth towards ſuch a Star or other part of the Firmament, it always
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keepeth directed towards the ſame, although carried round by
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the annual motion about the circumference of the ſaid Grand
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Orbe. </
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<
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>This alone is ſufficient to make the Wonder ceaſe, and
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to remove all difficulties. </
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>But what will
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Simplicius
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ſay, if to
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this non-indigence of the co-operating cauſe we ſhould adde
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an admirable intrinſick vertue of the Terreſtrial Globe, of
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ing with its determinate parts towards determinate parts of the
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Firmament, I ſpeak of the Magnetick vertue conſtantly
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pated by any whatſoever piece of Loade-ſtone. </
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<
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>And if every
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minute particle of that S one have in it ſuch a vertue, who will
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queſtion but that the ſame more powerfully reſides in this whole
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Terreſtrial Globe, abounding in that Magnetick matter, and
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which happily it ſelf, as to its internal and primary ſubſtance, is
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nothing elſe but a huge maſſe of Loade-ſtone.</
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