Galilei, Galileo
,
The systems of the world
,
1661
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<
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>SIMPL. </
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<
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>It is ſo; and I have oftentimes wiſh'd that the Air
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would grow thicker, that I might be able to ſee that ſame light
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more plainly; but it ever diſappeared before dark night.</
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<
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>SALV. </
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<
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>You know then very certainly, that in the depth of
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night, that light would be more conſpicuous.</
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<
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>SIMPL. </
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<
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>I do ſo; and alſo more than that, if one could but
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take away the great light of the creſcent illuminated by the Sun,
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the preſence of which much obſcureth the other leſſer.</
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<
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>SALV. Why, doth it not ſometimes come to paſs, that one may
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in a very dark night ſee the whole face of the Moon, without
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ing at all illuminated by the Sun?</
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<
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>SIMPL. </
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<
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>I know not whether this ever happeneth, ſave onely
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in the total Ecclipſes of the Moon.</
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<
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>SALV. Why, at that time this its light would appear very
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clear, being in a moſt obſcure
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medium,
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and not darkned by the
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clarity of the luminous creſcents: but in that poſition, how light
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did it appear to you?</
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<
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>SIMPL. </
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<
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>I have ſometimes ſeen it of the colour of braſs, and a
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little whitiſh; but at other times it hath been ſo obſcure, that I
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have wholly loſt the ſight of it.</
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<
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>SALV. </
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<
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>How then can that light be ſo natural, which you ſee ſo
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cleer in the cloſe of the twilight, notwithſtanding the impediment
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of the great and contiguous ſplendor of the creſcents; and which
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again, in the more obſcure time of night, all other light removed,
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appears not at all?</
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<
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>SIMPL. </
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<
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>I have heard of ſome that believed that ſame light to
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be participated to theſe creſcents from the other Stars, and in
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ticular from
<
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Venus,
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the Moons neighbour.</
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</
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<
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>SALV. </
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>
<
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>And this likewiſe is a vanity; becauſe in the time of
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its total obſcuration, it ought to appear more ſhining than ever;
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for you cannot ſay, that the ſhadow of the Earth intercepts the
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ſight of
<
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Venus,
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or the other Stars. </
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>
<
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>But to ſay true, it is not at
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that inſtant wholly deprived thereof, for that the Terreſtrial
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miſphere, which in that time looketh towards the Moon, is that
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where it is night, that is, an intire privation of the light of the Sun.
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</
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<
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>And if you but diligently obſerve, you will very ſenſibly perceive,
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that like as the Moon, when it is ſharp-horned, doth give very little
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light to the Earth; and according as in her the parts
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nated by the Suns light do encreaſe: ſo likewiſe the ſplendor to
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our ſeeming encreaſeth, which from her is reflected towards us;
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thus the Moon, whilſt it is ſharp-forked, and that by being between
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the Sun and the Earth, it diſcovereth a very great part of the
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reſtrial Hemiſphere illuminated, appeareth very clear: and
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ing from the Sun, and paſſing towards the ^{*}Quadrature, you
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may ſee the ſaid light by degrees to grow dim; and after the </
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>
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