Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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untie it, I ſhall hold you for more than an
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Alexander.
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*
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Bandola
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that
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end of a skeen
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where with
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wives faſten their
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hankes of yarn,
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thread or ſilk.</
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The grand
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ficulty in
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nicus
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his Doctrine,
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is that which
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cerns the
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mena
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of the Sun
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and fixed ſtars.
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*
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Pettine,
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it is
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the ſtay in a
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vets Loom, that
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permitteth no knot
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or ſnarle to paſſe
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it, called by them
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the Combe of the
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Loom.</
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>SALV. </
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>Theſe are ſcruples worthy of the ingenuity of
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dus,
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and this doubt is ſo intricate, that even
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Copernicus
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himſelf
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almoſt deſpaired of being able to explain the ſame, ſo as to
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render it intelligible, which we ſee as well by his own confeſſion
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of its obſcurity, as alſo by his, at two ſeveral times, taking two
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different wayes to make it out. </
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>And, I ingenuouſly confeſſe that
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I underſtood not his explanation, till ſuch time as another
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thod more plain and manifeſt, had rendred it intelligible; and
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yet neither was that done without a long and laborious
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tion of my thoughts to the ſame.</
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>SIMP.
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Ariſtotle
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ſaw the ſame ſcruple, and makes uſe
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of to oppoſe certain of the Ancients, who held that the Earth
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was a Planet; againſt whom he argueth, that if it were ſo, it
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would follow that it alſo, as the reſt of the Planets, ſhould have a
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plurality of motions, from whence would follow theſe
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ons in the riſings and ſettings of the fixed ſtars, and likewiſe in
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the Meridian Altitudes. </
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>And in regard that he propoundeth the
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difficulty, and doth not anſwer it, it muſt needs be, if not
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poſſible, at leaſt very difficult to be reſolved.</
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Ariſtotles
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ment againſt the
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Ancients, who held
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that the Earth
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was a Planet.
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<
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>SALV. </
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>The ſtreſſe and ſtrength of the knot rendereth the
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ſolution thereof more commendable and admirable; but I do
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not promiſe you the ſame at this time, and pray you to diſpenſe
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with me therein till too morrow, and for the preſent we will go
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conſidering and explaining thoſe mutations and differences that
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by means of the annual motion ought to be diſcerned in the
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ed ſtars, like as even now we ſaid, for the explication whereof
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certain preparatory points offer themſelves, which may
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tate the anſwer to the grand objection. </
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<
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>Now reaſſuming the
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two motions aſcribed to the Earth (two I ſay, for the third is
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no motion, as in its place I will declare) that is the annual and
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diurnal, the firſt is to be underſtood to be made by the centre of
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the Earth in or about the circumference of the grand Orb, that
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is of a very great circle deſcribed in the plain of the fixed and
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immutable Ecliptick; the other, namely the diurnal, is made
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by the Globe of the Earth in it ſelf about its own centre, and
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own Axis, not erect, but inclined to the Plane of the Ecliptick,
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with the inclination of 23. degrees and an half, or thereabouts,
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the which inclination is maintained all the year about, and that
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which ought eſpecially to be obſerved, is alwayes ſituate
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wards the ſame point of Heaven: in ſo much that the Axis of the
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diurnal motion doth alwayes remain parallel to it ſelf; ſo that
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if we imagine that ſame Axis to be continued out until it reach
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the fixed ſtars, whilſt the centre of the Earth is encircling the
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whole Ecliptick in a year, the ſaid Axis deſcribeth the </
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