Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ſmalneſſe of the body of this, in compariſon to the magnitude
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of the other, it cannot be denied but that the
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will
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and as it
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were
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valour
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of this, is very great. </
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<
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>Thus much for their
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gruities or reſemblances. </
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<
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>It ſhould next follow that we diſcourſe
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touching their diſparity; but becauſe
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Simplicius
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will favour us
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with his objections againſt the former, its neceſſary that we hear
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and examine them, before we proceed any farther.</
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Seventhly, The
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Earth and Moon
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do mutually eclipſe.
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<
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>SAGR. </
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>And the rather, becauſe it is to be ſuppoſed that
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Simplicius
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will not any wayes oppoſe the diſparities, and
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gruities betwixt the Earth and Moon, ſince that he accounts their
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ſubſtances extremely different.</
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>SIMPL. </
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>Amongſt the reſemblances by you recited, in the
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rallel you make betwixt the Earth and Moon, I find that I can
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admit none confidently ſave onely the firſt, and two others; I
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grant the firſt, namely, the ſpherical figure; howbeit, even in
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this there is ſome kind of difference, for that I hold that of the
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Moon to be very ſmooth and even, as a looking-glaſſe,
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as, we find and feel this of the Earth to be extraordinary
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ous and rugged; but this belonging to the inequality of
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cies, it ſhall be anon conſidered, in another of thoſe
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ces by you alledged; I ſhall therefore reſerve what I have to ſay
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thereof, till I come to the conſideration of that. </
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>Of what you
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affirm next, that the Moon ſeemeth, as you ſay in your ſecond
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Reſemblance, opacous and obſcure in its ſelf, like the Earth; I
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admit not any more than the firſt attribute of opacity, of which
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the Eclipſes of the Sun aſſure me. </
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>For were the Moon
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rent, the air in the total obſcuration of the Sun, would not
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come ſo duskiſh, as at ſuch a time it is, but by means of the
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tranſparency of the body of the Moon, a refracted light would
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paſſe through it, as we ſee it doth through the thickeſt clouds. </
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<
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>But
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as to the obſcurity, I believe not that the Moon is wholly
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ved of light, as the Earth; nay, that clarity which is ſeen in the
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remainder of its
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Diſcus,
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over and above the ſmall creſcent
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lightened by the Sun, I repute to be its proper and natural light,
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and not a reflection of the Earth, which I eſteem unable, by
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reaſon of its aſperity (craggineſſe) and obſcurity, to reflect the
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raies of the Sun. </
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<
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>In the third Parallel I aſſent unto you in one
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part, and diſſent in another: I agree in judging the body of the
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Moon to be moſt ſolid and hard, like the Earth, yea much more;
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for if from
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Ariſtotle
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we receive that the Heavens are impenetrable,
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and the Stars the moſt denſe parts of Heaven, it muſt neceſſarily
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follow, that they are moſt ſolid and moſt impenetrable.</
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The ſecond clarity
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of the Moon
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ſteemed to be its
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native light.
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<
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The Earth unable
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to reflect the Suns
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raies.
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The ſubſtance of
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the Heavens
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netrable,
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ing to
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Ariſtotle.</
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<
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>SAGR. </
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<
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>What excellent matter would the Heavens afford us for
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to make Pallaces of, if we could procure a ſubſtance ſo hard and ſo
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tranſparent?</
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