Galilei, Galileo
,
The systems of the world
,
1661
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leſſe forcible and offenſive to the ſight, than that primary and
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direct light of the Sun. </
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<
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>And thus without trouble do we behold
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the face of the Moon; which were it as a Glaſſe, it appearing to
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us by reaſon of its vicinity, as big as the Sun it ſelf, its ſplendor
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would be abſolutely intollerable, and would ſeem as if we beheld
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another Sun.</
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<
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>SALV. </
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<
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>Aſcribe not, I beſeech you
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Sagredus,
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more to my
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monſtration, than it produceth. </
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<
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>I will oppoſe you with an inſtance,
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which I ſee not well how you can eaſily reſolve. </
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<
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>You inſiſt upon it
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as a grand difference between the Moon and Glaſſe, that it emits
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its reflection towards all parts equally, as doth the Wall;
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as the Glaſſe caſts it upon one onely determinate place; and from
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hence you conclude the Moon to be like to the Wall, and not to
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the Glaſſe: But I muſt tell you, that that ſame Glaſſe caſts its
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reflection on one place onely, becauſe its ſurface is flat, and the
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reflex rayes being to depart at angles equal to thoſe of the rayes
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of incidence, it muſt follow that from a plane or flat ſuperficies,
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they do depart unitedly towards the ſame place; but in regard
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that the ſuperficies of the Moon is not plain, but ſpherical, and
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the incident rayes upon ſuch a ſuperficies, being to reflect
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ſelves at angles equal to thoſe of the incidence towards all parts,
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by means of the infinity of the inclinations which compoſe the
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ſpherical ſuperficies, therefore the Moon may ſend forth its
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on every way; and there is no neceſſity for its repercuſſion upon one
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place onely, as that Glaſſe which is flat.</
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Flat
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glaſſes caſt forth
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the reflection
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wards but one
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place, but the
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ſpherical every
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way.
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<
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>SIMPL. </
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<
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>This is one of the very ſame objections, which I
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tended to have made againſt him.</
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<
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>SAGR. </
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<
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>If this be one, you had need have more of them; yet
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I tell you, that as to this firſt, it ſeems to me to make more
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gainſt you, than for you.</
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<
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>SIMPL. </
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<
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>You have pronounced as a thing manifeſt, that the
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ction made by that Wall, is as cleer and lucid as that which the
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Moon ſends forth, and I eſteem it nothing in compariſon thereto.
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</
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<
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>“For, in this buſineſſe of the illumination, its requiſite to reſpect,
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and to diſtinguiſh the
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Sphere
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of
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Activity
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; and who queſtions
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but the Cœleſtial bodies have greater Spheres of activity, than
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theſe our elementary, frail, and mortal ones? </
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<
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>and that Wall,
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finally, what elſe is it but a little obſcure Earth, unapt to
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ſhine?”</
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The ſphere of
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Activity greater
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in the Cœleſtial
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bodies than in
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mentary.
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</
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</
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S
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AGR. </
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<
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>And here alſo I believe, that you very much deceive your
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felf. </
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>
<
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>But I come to the firſt objection moved by
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Salviatus
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; and
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I conſider, that to make a body appear unto us luminous, it
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ficeth not that the rayes of the illuminating body fall upon it,
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but it is moreover requiſite that the reflex rayes arrive to our
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eye; as is manifeſtly ſeen in the example of that Glaſſe, upon </
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