Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Quadrature, the ſame appears very weak, becauſe it continually
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loſeth more and more of the view of the luminous part of the
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Earth: and yet it ſhould ſucceed quite contrary, if that light were
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its own, or communicated to it from the Stars; for then we ſhould
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ſee it in the depth of night, and in ſo very dark an ambient.</
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*
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By the Moons two
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Quadratures
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you
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are to underſtand
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its firſt and last
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quarters, as
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ſtrologers call them
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>SIMPL. </
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>Stay a little; for I juſt now remember, that I have
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read in a little modern tract, full of many novelties; “That this
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ſecondary light is not derived from the Stars, nor innate in the
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Moon, and leaſt of all communicated by the Earth, but that it is
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received from the ſame illumination of the Sun, which, the
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ſtance of the Lunar Globe being ſomewhat tranſparent,
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trateth thorow all its body; but more livelily illuminateth the
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ſuperficies of the Hemiſphere expoſed to the rays of the Sun:
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and its proſundity imbuing, and (as I may ſay) ſwallowing that
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light, after the manner of a cloud or chryſtal, tranſmits it, and
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renders it viſibly lucid. </
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>And this (if I remember aright) he
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proveth by Authority, Experience and Reaſon; citing
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Cleomedes,
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Vitellion, Macrobius,
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and a certain other modern Author: and
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adding, That it is ſeen by experience to ſhine moſt in the days
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neareſt the Conjunction, that is, when it is horned, and is chiefly
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bright about its limb. </
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>And he farther writes, That in the Solar
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Ecclipſes, when it is under the
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Diſcus
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of the Sun, it may be ſeen
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tranſlucid, and more eſpecially towards its utmoſt Circle. </
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<
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>And
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in the next place, for Arguments, as I think, he ſaith, That it not
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being able to derive that light either from the Earth, or from the
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Stars, or from it ſelf, it neceſſarily follows, that it cometh from
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the Sun. </
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<
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>Beſides that, if you do but grant this ſuppoſition, one
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may eaſily give convenient reaſons for all the particulars that
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occur. </
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>For the reaſon why that ſecundary light ſhews more
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lively towards the outmoſt limb, is, the ſhortneſs of the ſpace
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that the Suns rays hath to penetrate, in regard that of the lines
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which paſs through a circle, the greateſt is that which paſſeth
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through the centre, and of the reſt, thoſe which are fartheſt from
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it, are always leſs than thoſe that are nearer. </
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>From the ſame
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principle, he ſaith, may be ſhewn why the ſaid light doth not
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much diminiſh. </
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<
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>And laſtly, by this way the cauſe is aſſigned
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whence it comes, that that ſame more ſhining circle about the
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utmoſt edge of the Moon, is ſeen at the time of the Solar
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clipſe, in that part which lyeth juſt under the
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Diſcus
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of the Sun,
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but not in that which is beſide the
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Diſcus
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: which happeneth
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becauſe the rays of the Sun paſs directly to our eye, through the
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parts of the Moon underneath: but as for the parts which are
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beſides it, they fall beſides the eye.”</
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The ſecondary
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light of the Moon
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cauſed by the Sun,
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according to ſome.
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<
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>SALV. </
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>If this Philoſopher had been the firſt Author of this
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pinion, I would not wonder that he ſhould be ſo affectionate to it, </
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