Galilei, Galileo
,
The systems of the world
,
1661
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<
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Solidity of the
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Lunar Globe
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ed from its being
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montainous.
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The Seas
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ction of light much
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weaker than that
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of the Earth.
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An experiment
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to prove the
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ction of the Water
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leſſe clear than
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that of the Land.
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<
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<
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>SIMPL. </
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<
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>Here I ſee the weſt part ſhine more than all the reſt of
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the pavement, and I ſee that it ſo hapneth, becauſe the
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ction of the light which entereth in at the window, cometh
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wards me.</
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<
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>SALV. </
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<
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>That moiſture hath done no more but filled thoſe little
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cavities which are in the brick with water, and reduced its
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ficies to an exact eveneſſe; whereupon the reflex rayes iſſue
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unitedly towards one and the ſame place; but the reſt of the
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pavement which is dry, hath its protuberances, that is, an
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merable variety of inclinations in its ſmalleſt particles;
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on the reflections of the light ſcatter towards all parts, but more
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weakly than if they had gone all united together; and therefore,
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the ſame ſheweth almoſt all alike, beheld ſeveral wayes, but far
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leſſe clear than the moiſtned brick. </
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>
<
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>I conclude therefore, that the
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ſurface of the Sea, beheld from the Moon, in like manner, as it
<
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would appear moſt equal, (the Iſlands and Rocks deducted) ſo it
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would ſhew leſſe clear than that of the Earth, which is montanous
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and uneven. </
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<
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>And but that I would not ſeem, as the ſaying is,
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to harp too much on one ſtring, I could tell you that I have
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ſerved in the Moon that ſecondary light which I told you came to
<
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her from the reflection of the Terreſtrial Globe, to be notably
<
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more clear two or three dayes before the conjunction, than after,
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that is, when we ſee it before break of day in the Eaſt, than
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when it is ſeen at night after Sun-ſet in the Weſt; of which
<
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ference the cauſe is, that the Terreſtrial Hemiſphere, which looks
<
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towards the Eaſtern Moon, hath little Sea, and much Land, to
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wit, all
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type
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Aſia,
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whereas, when it is in the Weſt, it beholds very
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great Seas, that is, the whole
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Atlantick
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type
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Ocean as far as
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America:
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type
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An Argument ſufficiently probable that the ſurface of the water
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appears leſſe ſplendid than that of the Earth.</
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<
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type
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The ſecondary
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light of the Moon
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clearer before the
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conjunction, than
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after.
<
emph.end
type
="
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</
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</
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<
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<
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>SIMPL. </
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>
<
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>So that perhaps you believe, thoſe great ſpots
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vered in the face of the Moon, to be Seas, and the other clearer
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parts to be Land, or ſome ſuch thing?</
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>
</
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<
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<
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>SALV. </
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>
<
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>This which you ask me, is the beginning of thoſe
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congruities which I eſteem to be between the Moon and the
<
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Earth, out of which it is time to diſ-ingage our ſelves, for we
<
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have ſtayed too long in the Moon. </
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>
<
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>I ſay therefore, that if there
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were in nature but one way onely, to make two ſuperficies
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ted by the Sun, to appear one more clear than the other, and
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that this were by the being of the one Earth, and the other
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ter; it would be neceſſary to ſay that the ſurface of the Moon
<
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were part earthy and part aquatick; but becauſe we know many
<
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wayes to produce the ſame effect (and others there may be which
<
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we know not of;) therefore I dare not affirm the Moon to
<
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ſiſt of one thing more than another: It hath been ſeen already </
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