Galilei, Galileo
,
The systems of the world
,
1661
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together with
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Appollonius Pergæus
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in
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lib.
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5. of his Revolutions,
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Chap.
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35.</
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The ſole annual
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motion of the
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Earth cauſeth
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great inequality of
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motions in the five
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Planets.
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A demonſtration of
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the inequalities of
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the three ſuperiour
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Planets dependent
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on the annual
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tion of the Earth.
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Retrogradations
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more frequent in
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Saturn,
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leſſe in
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piter,
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and yet leſſe
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in
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Mars,
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and why.
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The
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tion of
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Venus
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and
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Mercury
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ſtrated by
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nius
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and
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cus.</
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<
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>You ſee, Gentlemen, with what facility and ſimplicity the
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al motion, were it appertaining to the Earth, is accommodated
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to render a reaſon of the apparent exorbitances, that are obſerved
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in the motions of the five Planets,
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Saturn, Jupiter, Mars,
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nus
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and
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Mercury,
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taking them all away, and reducing them to
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equal and regular motions. </
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>And of this admirable effect,
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cholas Copernicus,
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hath been the firſt that hath made the reaſon
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plain unto us. </
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>But of another effect, no leſſe admirable than
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this, and that with a knot, perhaps more difficult to unknit,
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bindeth the wit of man, to admit this annual converſion, and to
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leave it to our Terreſtrial Globe; a new and unthought of
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jecture ariſeth from the Sun it ſelf, which ſheweth that it is
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ling to be ſingular in ſhifting, of this atteſtation of ſo eminent a
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concluſion, rather as a teſtimony beyond all exception, it hath
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deſired to be heard apart. </
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<
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>Hearken then to this great and new
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The annual
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tion of the Earth
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moſt apt to render
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a reaſon of the
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orbttances of the
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five Planets.
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The Sun it ſelf
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teſtifieth the
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al motion to belong
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to the Earth.
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The Lyncæan
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Academick the
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firſt diſcoverer of
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the Solar ſpots, and
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all the other
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ſtial novelties.
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<
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>The firſt diſcoverer and obſerver of the
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Solar
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ſpots, as alſo of
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all the other Cœleſtial novelties, was our
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Academick Lincæus
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; and
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he diſcovered them
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anno
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1610. being at that time Reader of the
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Mathematicks,
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in the Colledge of
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Padua,
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and there, and in
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nice,
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he diſcourſed thereof with ſeveral perſons, of which ſome </
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are yet living: And the year following, he ſhewed them in
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Rome
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to many great perſonages, as he relates in the firſt of his Letters
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to
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Marcus Velſerus,
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^{*} Sheriffe of
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Auguſta.
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He was the
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firſt that againſt the opinions of the too timorous and too jealous
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aſſertors of the Heavens inalterability, affirmed thoſe ſpots to be
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matters, that in ſhort times were produced and diſſolved: for as
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to place, they were contiguous to the body of the Sun, and
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volved about the ſame; or elſe being carried about by the ſaid
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Solar body, which revolveth in it ſelfe about its own Centre, in
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the ſpace almoſt of a moneth, do finiſh their courſe in that time;
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which motion he judged at firſt to have been made by the Sun
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bout an Axis erected upon the plane of the Ecliptick; in regard
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that the arches deſcribed by the ſaid ſpots upon the
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Diſcus
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of the
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Sun appear unto our eye right lines, and parallels to the plane of
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the Ecliptick: which therefore come to be altered, in part, with
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ſome accidental, wandring, and irregular motions, to which they
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are ſubject, and whereby tumultuarily, and without any order
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they ſucceſſively change ſituations amongſt themſelves, one
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while crouding cloſe together, another while diſſevering, and
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ſome dividing themſelves into many and very much changing
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gures, which, for the moſt part, are very unuſual. </
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<
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>And albeit
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thoſe ſo inconſtant mutations did ſomewhat alter the primary </
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