Galilei, Galileo
,
The systems of the world
,
1661
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<
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>SAGR. </
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<
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>Why look you, there it is upon the oppoſite Wall, juſt
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as big as the Glaſſe, and little leſſe bright than if the Sun had
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directly ſhined upon it.</
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<
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>SIMPL. </
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<
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>Come hither therefore, and ſee from hence the
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face of the Glaſſe, and tell me whether you think it more
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ſcure than that of the Wall.</
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<
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>SAGR. </
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<
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>Look on it your ſelf, for I have no mind at this time,
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to dazle my eyes; and I know very well, without ſeeing it,
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that it there appears as ſplendid and bright as the Sun it ſelf, or
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little leſſe.</
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<
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>SIMPL. </
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<
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>What ſay you therefore, is the reflection of a Glaſſe
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leſſe powerful than that of a Wall? </
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<
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>I ſee, that in this oppoſite
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Wall, where the reflection of the other illuminated Wall comes,
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together with that of the Glaſſe, this of the Glaſſe is much
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clearer; and I ſee likewiſe, that, from this place where I ſtand,
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the glaſſe it ſelf appears with much more luſtre than the Wall.</
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<
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>SALV. </
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<
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>You have prevented me with your ſubtlety; for I ſtood
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in need of this very obſervation to demonſtrate what remains.
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<
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>You ſee then the difference which happens betwixt the two
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ctions made by the two ſuperficies of the Wall and Glaſſe,
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cu'ſt in the ſelf-ſame manner, by the rayes of the Sun; and you
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ſee, how the reflection which comes from the Wall, diffuſeth it
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ſelf towards all the parts oppoſite to it, but that of the Glaſſe
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goeth towards one part onely, not at all bigger than the Glaſſe
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it ſelf: you ſee likewiſe, how the ſuperficies of the Wall, beheld
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from what part ſoever, alwayes ſhews it ſelf of one and the ſame
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cleerneſſe, and every way, much clearer than that of the Glaſſe,
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excepting only in that little place, on which the Glaſſes reflection
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reverberates, for from thence indeed the Glaſſe appears much more
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lucid than the Wall. </
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<
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>By theſe ſo ſenſible, and palpable
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ments, my thinks one may ſoon come to know, whether the
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reflection which the Moon ſends upon us, proceed as from a
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Glaſſe, or elſe, as from a Wall, that is, from a ſmooth
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cies, or a rugged.</
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<
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>SAGR. </
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<
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>If I were in the Moon it ſelf, I think I could not with
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my hands more plainly feel the unevenneſſe of its ſuperficies, than
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I do now perceive it, by apprehending your diſcourſe. </
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<
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>The Moon
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beheld in any poſture, in reſpect of the Sun and us, ſheweth us
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its ſuperficies, touch't by the Suns rayes, alwayes equally clear;
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an effect, which anſwers to an hair that of the Wall, which
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held from what place ſoever, appeareth equally bright, and
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fereth from the Glaſſe, which from one place onely appeareth
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cid, and from all others obſcure. </
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<
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>Moreover, the light which
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cometh to me from the reflection of the Wall, is tollerable,
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and weak, in compariſon of that of the Glaſſe, which is little </
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