Galilei, Galileo
,
The systems of the world
,
1661
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riodick courſe of the ſaid ſpots, yet did they not alter the
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on of our friend, ſo as to make him believe, that they were any
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eſſential and fixed cauſe of thoſe deviations, but he continued to
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hold, that all the apparent alterations derived themſelves from
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thoſe accidental mutations: in like manner, juſt as it would
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pen to one that ſhould from far diſtant Regions obſerve the
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tion of our Clouds; which would be diſcovered to move with a
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moſt ſwift, great, and conſtant motion, carried round by the
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urnal
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Vertigo
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of the Earth (if haply that motion belong to the
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ſame) in twenty four hours, by circles parallel to the
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al, but yet altered, in part, by the accidental motions cauſed by
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the winds, which drive them, at all adventures, towards different
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quarters of the World. </
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<
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>While this was in agitation, it came to
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paſs that
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Velſerus
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ſent him two Letters, written by a certain
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ſon, under the feigned name of ^{*}
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Apelles,
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upon the ſubject of
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theſe Spots, requeſting him, with importunity, to declare his
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thoughts freely upon thoſe Letters, and withall to let him know
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what his opinion was touching the eſſence of thoſe ſpots; which his
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requeſt he ſatisfied in 3 Letters, ſhewing firſt of all howvain the
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conjectures of
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Apelles
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were; & diſcovering, ſecondly, his own
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nions; withal foretelling to him, that
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Apelles
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would undoubtedly
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be better adviſed in time, and turn to his opinion, as it afterwards
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came to paſs. </
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<
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>And becauſe that our Academian (as it was alſo
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the judgment of many others that were intelligent in Natures
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crets) thought he had in thoſe three Letters inveſtigated and
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monſtrated, if not all that could be deſired, or required by
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mane curioſity, at leaſt all that could be attained by humane
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reaſon in ſuch a matter, he, for ſome time (being buſied in other
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ſtudies) intermitted his continual obſervations, and onely in
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placency to ſome friend, joyned with him, in making now and
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then an abrupt obſervation: till that he, and after ſome years,
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we, being then at my ^{*} Country-ſeat, met with one of the
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ry Solar ſpots very big, and thick, invited withal by a clear and
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conſtant ſerenity of the Heavens, he, at my requeſt, made
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vations of the whole progreſſe of the ſaid ſpot, carefully marking
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upon a ſheet of paper the places that it was in every day at the
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time of the Suns coming into the Meridian; and we having found
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that its courſe was not in a right line, but ſomewhat incurvated,
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we came to reſolve, at laſt, to make other obſervations from time
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to time; to which undertaking we were ſtrongly induced by a
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conceit, that accidentally came into the minde of my Gueſt,
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which he imparted to me in theſe or the like words.</
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The hiſtory of
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the proceedings of
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the Academian
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for a long time
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bout the
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on of the Solar
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ſpots.
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* Duumviro.</
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* This Authors
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true name is
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ſtopher Scheiner us
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a Jeſuit, and his
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Book here meant
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is intituled,
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les poſt tabulam.
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* La mia villa
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delle Selue.</
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<
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>In my opinion,
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Philip,
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there is a way opened to a buſineſs of
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very great conſequence. </
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<
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>For if the Axis about which the Sun
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turneth be not erect perpendicularly to the plane of the </
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