Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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twice as great as that from the Sun to us) in the ſtar of
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Saturn
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is
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almoſt totally imperceptible, and in
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Jupiter
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not very
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ble, what ſhall we think of the fixed ſtars, which I believe you
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will not ſcruple to place twice as far off as
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Saturn
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? </
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<
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>In
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Mars,
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which for that it is nearer to us -------</
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In objects far
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remote, and
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nous, a ſmall
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proach or receſſion
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is imperceptible.
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>SIMP. </
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>Pray Sir, put your ſelf to no farther trouble in this
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particular, for I already conceive that what hath been ſpoken
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touching the unaltered apparent magnitude of the fixed ſtars may
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very well come to paſſe, but what ſhall we ſay of the other
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ficulty that proceeds from not perceiving any variation in the
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mutation of aſpect?</
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<
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>SALV. </
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>We will ſay that which peradventure may ſatisfie
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you alſo in this particular. </
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>And to make ſhort, would you not
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be ſatisfied if there ſhould be diſcovered in the ſtars face
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tions that you think ought to be diſcovered, in caſe the annual
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motion belonged to the Earth?</
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>I ſhould ſo doubtleſſe, as to what concerns this
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ticular.</
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<
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<
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>I could wiſh you would ſay that in caſe ſuch a
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rence were diſcovered, nothing more would remain behind, that
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might render the mobility of the Earth queſtionable. </
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>But
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though yet that ſhould not ſenſibly appear, yet is not its
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bility removed, nor its immobility neceſſarily proved, it being
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poſſible, (as
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Copernicus
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affirmeth) that the immenſe diſtance of
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the Starry Sphere rendereth ſuch very ſmall
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Phænomena
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vable; the which as already hath been ſaid, may poſſibly not
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have been hitherto ſo much as ſought for, or if ſought for, yet
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not ſought for in ſuch a way as they ought, to wit, with that
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exactneſſe which to ſo minute a punctuality would be neceſſary;
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which exactneſſe is very difficult to obtain, as well by reaſon of the
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deficiency of Aſttonomical Inſtruments, ſubject to many
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tions, as alſo through the fault of thoſe that manage them with leſs
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diligence then is requiſite. </
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>A neceſſary argument how little
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dit is to be given to thoſe obſervations may be deduced from the
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differences which we find amongſt Aſtronomers in aſſigning the
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places, I will not ſay, of the new Stars or Comets, but of the fixed
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ſtars themſelves, even to the altitudes of the very Poles, in
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which, moſt an end, they are found to differ from one another
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many minutes. </
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>And to ſpeak the truth, who can in a Quadrant,
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or Sextant, that at moſt ſhall have its ſide ^{*} 3. or 4. yards long,
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aſcertain himſelf in the incidence of the perpendicular, or in the
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direction of the ſights, not to erre two or three minutes, which
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in its circumference ſhall not amount to the breadth of a grain of
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^{*}
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Mylet
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? </
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<
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>Beſides that, it is almoſt impoſſible, that the Inſtrument
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ſhould be made, and kept with abſolute exactneſſe.
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Ptolomey
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