Galilei, Galileo
,
The systems of the world
,
1661
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do ask the queſtion ſeriouſly; and therefore anſwer me: and if
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afterwards you ſhall think that I ſpeak impertinently, I will be
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content to be the ſenſeleſs man: for he is much more a fool who
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interrogates ſimply, than he to whom the queſtion is put.</
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<
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>SIMPL. </
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>If then you do not think me altogether ſimple, take
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it for granted that I have anſwered you already, and ſaid, that it
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is impoſſible, that one that is upon the Earth, as we are, ſhould ſee
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by night that part of the Earth where it is day, namely, that is
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luminated by the Sun.</
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>SALV. </
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<
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>Therefore you have never ſeen the Earth enlightned,
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ſave onely by day; but you ſee the Moon to ſhine alſo in the
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dead of night. </
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<
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>And this is the cauſe,
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Simplicius,
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which makes
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you believe that the Earth doth not ſhine like the Moon; but if
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you could ſee the Earth illuminated, whilſt you were in ſome dark
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place, like our night, you would ſee it ſhine brighter than the
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Moon. </
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<
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>Now if you deſire that the compariſon may proceed
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well, you muſt compare the light of the Earth, with that of the
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Moon ſeen in the day time, and not with the ſame by night: for
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it is not in our power to ſee the Earth illuminated, ſave onely in
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the day. </
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<
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>Is it not ſo?</
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<
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>SIMPL. </
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<
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>So it ought to be.</
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>SALV. </
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<
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>And foraſmuch as you your ſelf have already confeſſed
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to have ſeen the Moon by day among ſome little white Clouds,
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and very nearly, as to its aſpect, reſembling one of them; you did
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thereby grant, that thoſe Clouds, which yet are Elementary
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matters, are as apt to receive illumination, as the Moon, yea
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more, if you will but call to mind that you have ſometimes ſeen
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ſome Clouds of vaſt greatneſs, and as perfect white as the Snow;
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and there is no queſtion, but that if ſuch a Cloud could be
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tinued ſo luminous in the deep of night, it would illuminate the
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places near about it, more than an hundred Moons. </
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<
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>If therefore
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we were aſſured that the Earth is illuminated by the Sun, like one
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of thoſe Clouds, it would be undubitable, but that it would be no
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leſs ſhining than the Moon. </
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>But of this there is no queſtion to
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be made, in regard we ſee thoſe very Clouds in the abſence of
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the Sun, to remain by night, as obſcure as the Earth: and that
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which is more, there is not any one of us, but hath ſeen many
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times ſome ſuch Clouds low, and far off, and queſtioned whether
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they were Clouds or Mountains: an evident ſign that the
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tains are no leſs luminous than thoſe
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Clouds are no leſs
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apt than the Moon
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to be illuminated
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by the Sun.
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A wall
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ted by the Sun,
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compared to the
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Moon ſhineth no
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leſs than it.
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<
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>SAGR. </
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<
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>But what needs more diſcourſe? </
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<
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>See yonder the Moon
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is riſen, and more than half of it illuminated; ſee there that wall,
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on which the Sun ſhineth; retire a little this way, ſo that you ſee
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the Moon ſideways with the wall: look now; which of them
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ſhews more lucid? </
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<
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>Do not you ſee, that if there is any advantage, </
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