Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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<
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>SAGR. </
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<
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>I am what ever pleaſeth
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Salviatus,
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but I pray you,
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let us not ſally out into another kind of digreſſion complemental;
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for at this time I am a Philoſopher, and in the Schools, not in the
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Court.</
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<
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>SALV. </
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<
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>Let our contemplation begin therefore with this
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deration, that whatſoever motion may be aſcribed to the Earth,
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it is neceſſary that it be to us, (as inhabitants upon it, and
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quently partakers of the ſame) altogether imperceptible, and as if
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it were not at all, ſo long as we have regard onely to terreſtrial
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things; but yet it is on the contrary, as neceſſary that the ſame
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motion do ſeem common to all other bodies, and viſible
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jects, that being ſeparated from the Earth, participate not of the
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ſame. </
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<
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>So that the true method to find whether any kind of motion
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may be aſcribed to the Earth, and that found, to know what it
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is, is to conſider and obſerve if in bodies ſeparated from the
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Earth, one may diſcover any appearance of motion, which
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qually ſuiteth to all the reſt; for a motion that is onely ſeen,
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v. </
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<
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>gr.
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in the
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Moon,
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and that hath nothing to do with
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Venus
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or
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Jupiter,
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or any other Stars, cannot any way belong to the Earth, or to
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any other ſave the Moon alone. </
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<
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>Now there is a moſt general and
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grand motion above all others, and it is that by which the Sun,
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the Moon, the other Planets, and the Fixed Stars, and in a word,
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the whole Univerſe, the Earth onely excepted, appeareth in our
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thinking to move from the Eaſt towards the Weſt, in the ſpace of
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twenty four hours; and this, as to this firſt appearance, hath no
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obſtacle to hinder it, that it may not belong to the Earth alone,
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as well as to all the World beſides, the Earth excepted; for the
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ſame aſpects will appear in the one poſition, as in the other.
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</
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<
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>Hence it is that
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Ariſtotle
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and
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Ptolomy,
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as having hit upon this
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ſideration, in going about to prove the Earth to be immoveable,
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argue not againſt any other than this
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Diurnal
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Motion; ſave onely
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that
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Ariſtotle
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hinteth ſomething in obſcure terms againſt another
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Motion aſcribed to it by an
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Ancient,
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of which we ſhall ſpeak in
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its place.</
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The motions of
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the Earth are
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perceptible to its
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inhabitants.
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The Earth can
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have no other
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tions, than thoſe
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which to us appear
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commune to all the
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rest of the
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verſe, the Earth
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excepted.
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</
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</
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<
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<
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The Diurnal
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tion, ſeemeth
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mune to all the
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niverſe, ſave onely
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the Earth excepted.
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</
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</
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<
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>
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Ariſtotle
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type
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and
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Ptolomy
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argue
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gainſt the
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nal Motion
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buted to the Earth.
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type
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</
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</
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<
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>SAGR. </
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>
<
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>I very well perceive the neceſſity of your illation: but
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I meet with a doubt which I know not how to free my ſelf from,
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and this it is, That
<
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Copernicus
<
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aſſigning to the Earth another
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tion beſide the Diurnal, which, according to the rule even now laid
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down, ought to be to us, as to appearance, imperceptible in the
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Earth, but viſible in all the reſt of the World; me thinks I may
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neceſſarily infer, either that he hath manifeſtly erred in aſſigning
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the Earth a motion, to which there appears not a general
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ſpondence in Heaven; or elſe that if there be ſuch a congruity
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therein,
<
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Ptolomy
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on the other hand hath been deficient in not
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futing this, as he hath done the other.</
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>
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