Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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345[354]
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facility apprehended in the
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Prolomaick
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Syſteme.</
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<
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>SALV. </
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<
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>I neither ought, nor can deny any thing that
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Sagredus
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ſhall requeſt: And the delay by me deſired was to no other end,
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ſave only that I might have time once again to methodize thoſe
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prefatory points, in my fancy, that ſerve for a large and plain
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claration of the manner how the forenamed accidents follow, as
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well in the
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Copernican
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poſition, as in the
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Ptolomaick
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: nay, with
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much greater facility and ſimplicity in that than in this. </
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<
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>Whence
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one may manifeſtly conceive that Hypotheſis to be as eaſie to be
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effected by nature, as difficult to be apprehended by the
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ſtanding: yet nevertheleſſe, I hope by making uſe of another
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kind of explanation, than that uſed by
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Copernicus,
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to render
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wiſe the apprehending of it ſomewhat leſſe obſcure. </
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<
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>Which
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that I may do, I will propoſe certain ſuppoſitions of themſelves
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known and manifeſt, and they ſhall be theſe that follow.</
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The
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can
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Syſteme
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cult to be
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ſtood, but eaſie to
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be effected.
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Neceſſary
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poſitions for the
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better conceiving
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of the conſequences
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of the Earths
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tion.
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<
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>Firſt, I ſuppoſe that the Earth is a ſpherical body, turning
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round upon its own Axis and Poles, and that each point aſſigned
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in its ſuperficies, deſcribeth the circumference of a circle,
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er or leſſer, according as the point aſſigned ſhall be neerer or
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farther from the Poles: And that of theſe circles the greateſt is
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that which is deſcribed by a point equidiſtant from the ſaid Poles;
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and all theſe circles are parallel to each other; and
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Parallels
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we
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will call them.</
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<
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>Secondly, The Earth being of a Spherical Figure, and of an
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pacous ſubſtance, it is continually illuminated by the Sun,
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ding to the half of its ſurface, the other half remaining obſcure,
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and the boundary that diſtinguiſheth the illuminated part from
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the dark being a grand circle, we will call that circle the
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nator of the light.
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<
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>Thirdly, If the Circle that is terminator of the light ſhould
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paſſe by the Poles of the Earth, it would cut (being a grand
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and principal circle) all the parallels into equal parts; but not
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paſſing by the Poles, it would cut them all in parts unequal,
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cept only the circle in the middle, which, as being a grand circle
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will be cut into equal parts.</
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<
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>Fourthly, The Earth turning round upon its own Poles, the
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quantities of dayes and nights are termined by the arches of the
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Parallels, interſected by the circle, that is, the terminator of the
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light, and the arch that is ſcituate in the illuminated Hemiſphere
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preſcribeth the length of the day, and the remainer is the
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tity of the night.</
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<
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>Theſe things being preſuppoſed, for the more clear
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ſtanding of that which remaines to be ſaid, we will lay it down
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in a Figure. </
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<
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>And firſt, we will draw the circumference of a
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circle, that ſhall repreſent unto us that of the grand Orb </
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