Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ſcending towards the right, in the point F. </
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<
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>What I have
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therto ſaid, being underſtood, I believe that there remains no
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difficulty in conceiving how ſrom the paſſing of the terminator of
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the Solar Hemiſpheres by the Poles of the Suns converſion, or
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neer or far from the ſame, do ariſe all the differences in the
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rent courſes of the ſpots; ſo that by how much the more thoſe Poles
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ſhall be remote from the ſaid terminator, by ſo much the more ſhall
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thoſe courſes be incurvated, and leſſe oblique; whereupon at
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the ſame diſtance, that is, when thoſe Poles are in the ſection of
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the Meridian, the incurvation is reduced to the greateſt, but the
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obliquity to the leaſt, that is to
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Æquilibrium,
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as the ſecond of
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theſe three laſt figures [
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viz. </
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<
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>Fig.
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5.] demonſtrateth. </
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<
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>On the
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contrary, when the Poles are in the terminator, as the firſt of
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theſe three figures [
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viz. </
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<
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4.] ſheweth the inclination is at
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the greateſt, but the incurvation at the leaſt, and reduced to
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rectitude. </
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<
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>The terminator departing from the Poles, the curvity
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begins to grow ſenſible, the obliquity all the way encreaſing,
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and the inclination growing leſſer.</
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The firſt
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cident to be
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ved in the motion
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of the Solar ſpots;
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and conſequently
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all the reſt
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ned.
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<
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>Theſe are thoſe admirable and extravagant mutations, that my
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Gueſt told me would from time to time appear in the progreſſes
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of the Solar ſpots, if ſo be it ſhould be true that the annual
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tion belonged to the Earth, and that the Sun being conſtituted
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in the centre of the Ecliptick, were revolved in it ſelf upon an
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Axis, not erect, but inclined to the Plane of the ſaid
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tick.</
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<
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>SAGR. </
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>I do now very well apprehend theſe conſequences,
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and believe that they will be better imprinted in my fancy, when
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I ſhall come to reflect upon them, accommodating a Globe to
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thoſe inclinations, and then beholding them from ſeveral
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ces. </
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<
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>It now remains that you tell us what followed afterwards
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touching the event of theſe imaginary
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The events
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ing obſerved, were
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anſwerable to the
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predictions.
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<
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>SALV. </
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>It came to paſſe thereupon, that continuing many
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veral moneths to make moſt accurate obſervations, noting down
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with great exactneſſe the courſes or tranſitions of ſundry ſpots at
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divers times of the year, we found the events punctually to
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reſpond to the predictions.</
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<
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>SAGR.
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Simplicius,
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if this which
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Salviatus
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ſaith be true; (nor
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can we diſtruſt him upon his word) the
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Ptolomeans
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and
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teleans
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hadneed of ſolid arguments, ſtrong conjectures, and
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well grounded experiments to counterpoiſe an objection of ſo
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much weight, and to ſupport their opinion from its final
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throw.</
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<
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>SIMP. </
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<
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>Fair and ſoftly good Sir, for haply you may not yet
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be got ſo far as you perſwade your ſelf you are gone. </
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<
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>And
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though I am not an abſolute maſter of the ſubject of that </
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