Galilei, Galileo
,
The systems of the world
,
1661
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which, without queſtion, the illuminating rayes of the Sun do
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come; yet nevertheleſſe, it appears not to us bright and ſhining,
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unleſſe we ſet our eye in that particular place, where the
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ction arriveth. </
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>Now let us conſider what would ſucceed, were
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the glaſſe of a ſpherical figure; for without doubt, we ſhould
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find, that of the reflection made by the whole ſurface
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ted, that to be but a very ſmall part, which arriveth to the eye
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of a particular beholder; by reaſon that that is but an
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rable particle of the whole ſpherical ſuperficies, the inclination
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of which caſts the ray to the particular place of the eye; whence
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the part of the ſpherical ſuperficies, which ſhews it ſelf ſhining
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to the eye, muſt needs be very ſmall; all the reſt being
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ſented obſcure. </
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<
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>So that were the Moon ſmooth, as a
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glaſſe, a very ſmall part would be ſeen by any particular eye to
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be illuſtrated by the Sun, although its whole Hemiſphere were
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poſed to the Suns rayes; and the reſt would appear to the eye of
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the beholder as not illuminated, and therefore inviſible; and
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finally, the whole Moon would be likewiſe inviſible, for ſo much
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as that particle, whence the reflection ſhould come, by reaſon of
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its ſmalneſſe and remoteneſſe, would be loſt. </
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<
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>And as it would be
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inviſible to the eye, ſo would it not afford any light; for it is
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together impoſſible, that a bright body ſhould take away our
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darkneſſe by its ſplendor, and we not to ſee it.</
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The Moon if it
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were ſmooth, like a
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ſpherical glaſſe,
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would be inviſible.
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<
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>SALV. </
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<
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>Stay good
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Sagredus,
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for I ſee ſome emotions in
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the face and eyes of
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Simplicius,
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which are to me as indices that
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he is not either very apprehenſive of, or ſatisfied with this which
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you, with admirable proof, and abſolute truth have ſpoken.
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<
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>And yet I now call to mind, that I can by another experiment
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remove all ſcruple. </
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<
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>I have ſeen above in a Chamber, a great
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ſpherical Looking-glaſſe; let us ſend for it hither, and whileſt it
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is in bringing, let
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Simplicius
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return to conſider, how great the
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clarity is which cometh to the Wall here, under the penthouſe,
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from the reflection of the flat glaſſe.</
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<
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>SIMPL. </
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<
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>I ſee it is little leſſe ſhining, than if the Sun had
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rectly beat upon it.</
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<
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>SALV. </
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<
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>So indeed it is. </
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>Now tell me, if taking away that ſmall
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flat glaſſe, we ſhould put that great ſpherical one in the ſame
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place, what effect (think you) would its reflection have upon the
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ſame Wall?</
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IMPL. </
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>I believe that it would eject upon it a far greater and
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more diffuſed light.</
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S
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ALV. </
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<
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>But if the illumination ſhould be nothing, or ſo
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ſmall, that you would ſcarſe diſcern it, what would you ſay
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then?</
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IMPL. </
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<
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>When I have ſeen the effect, I will bethink my ſelf
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of an anſwer.</
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