Galilei, Galileo
,
The systems of the world
,
1661
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of a particular perſon, by reaſon of its great diſtance would be
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viſible, as I have ſaid before.</
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The reflex light
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of uneven bodies, is
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more univerſal
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than that of the
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ſmooth, & why.
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The Moon, if it
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were ſmooth and
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ſleek, would be
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viſible.
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<
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>SIMPL. </
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>I am very apprehenſive of your diſcourſe; yet
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thinks I am able to reſolve the ſame with very little trouble; and
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eaſily to maintain, that the Moon is rotund and polite, and that it
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reflects the Suns light unto us in manner of a glaſs; nor
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fore ought the image of the Sun to be ſeen in the middle of it,
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aſmuch as the ſpecies of the Sun it ſelf admits not its ſmall figure
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to be ſeen at ſo great a diſtance, but the light produced by the
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Sun may help us to conceive that it illuminateth the whole
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nar Body: a like effect we may ſee in a plate gilded and well
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polliſh'd, which touch't by a luminous body, appeareth to him
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that beholds it at ſome diſtance to be all ſhining; and onely near
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at hand one may diſcover in the middle of it the ſmall image of
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the luminous body.”</
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>SALV. </
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>Ingenuouſly confeſſing my dullneſs of apprehenſion,
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I muſt tell you, that I underſtand not any thing of this your
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courſe, ſave onely what concerns the gilt plate: and if you permit
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me to ſpeak freely, I have a great conceit that you alſo underſtand
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not the ſame, but have learnt by heart thoſe words written by ſome
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one out of a deſire of contradiction, and to ſhew himſelf more
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ligent than his adverſary; but it muſt be to thoſe, which to appear
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alſo more wiſe, applaud that which they do not underſtand, and
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entertain a greater conceit of perſons, the leſs they are by them
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underſtood: and the writer himſelf may be one of thoſe (of which
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there are many) who write what they do not underſtand, and
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conſequently underſtand not what they write. </
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<
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>Therefore,
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mitting the reſt, I reply, as to the gilt plate, that if it be flat and
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not very big, it may appear at a diſtance very bright, whilſt a great
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light beameth upon it, but yet it muſt be when the eye is in a
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terminate line, namely in that of the reflex rays: and it will
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pear the more ſhining, if it were
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v. </
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of ſilver, by means of its
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being burniſhed, and apt through the great denſity of the metal,
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to receive a perfect poliſh. </
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>And though its ſuperficies, being very
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well brightned, were not exactly plain, but ſhould have various
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clinations, yet then alſo would its ſplendor be ſeen many ways;
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namely, from as many places as the various reflections, made by
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the ſeveral ſuperficies, do reach: for therefore are Diamonds
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ground to many ſides, that ſo their pleaſing luſtre might be beheld
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from many places. </
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>But if the Plate were very big, though it ſhould
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be all plain, yet would it not at a diſtance appear all over ſhining:
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and the better to expreſs my ſelf, Let us ſuppoſe a very large gilt
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plate expoſed to the Sun, it will ſhew to an eye far diſtant, the
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image of the Sun, to occupy no more but a certain part of the ſaid
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plate; to wit, that from whence the reflection of the incident </
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