Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Sun; which were it not ſo, it could not do. </
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<
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>Thirdly, I hold its
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matter to be moſt denſe and ſolid as the Earth is, which I clearly
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argue from the unevenneſs of its ſuperficies in moſt places, by means
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of the many eminencies and cavities diſcovered therein by help of
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the
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ſeleſcope
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: of which eminencies there are many all over it,
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rectly reſembling our moſt ſharp and craggy mountains, of which
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you ſhall there perceive ſome extend and run in ledges of an
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dred miles long; others are contracted into rounder forms; and
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there are alſo many craggy, ſolitary, ſteep and cliffy rocks. </
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<
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>But
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that of which there are frequenteſt appearances, are certain Banks
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(I uſe this word, becauſe I cannot thing of another that better
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preſſeth them) pretty high raiſed, which environ and incloſe fields
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of ſeveral bigneſſes, and form ſundry figures, but for the moſt part
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circular; many of which have in the midſt a mount raiſed pretty
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high, and ſome few are repleniſhed with a matter ſomewhat
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ſcure, to wit, like to the great ſpots diſcerned by the bare eye, and
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theſe are of the greateſt magnitude; the number moreover of thoſe
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that are leſſer and leſſer is very great, and yet almoſt all circular.
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Fourthly, like as the ſurface of our Globe is diſtinguiſhed into two
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principal parts, namely, into the Terreſtrial and Aquatick: ſo in
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the Lunar ſurface we diſcern a great diſtinction of ſome great fields
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more reſplendant, and ſome leſs: whoſe aſpect makes me believe,
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that that of the Earth would ſeem very like it, beheld by any one
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from the Moon, or any other the like diſtance, to be illuminated
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by the Sun: and the ſurface of the ſea would appear more
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ſcure, and that of the Earth more bright. </
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<
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>Fifthly, like as we from
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the Earth behold the Moon, one while all illuminated, another
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while half; ſometimes more, ſometimes leſs; ſometimes horned,
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ſometimes wholly inviſibly; namely, when its juſt under the Sun
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beams; ſo that the parts which look towards the Earth are dark:
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Thus in every reſpect, one ſtanding in the Moon would ſee the
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illumination of the Earths ſurface by the Sun, with the ſame
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periods to an hair, and under the ſame changes of figures.
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<
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The
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Firſt
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blance between the
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Moon and Earth;
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which is that of
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figure; is proved by
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the manner of
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ing illuminated by
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the Sun.
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The
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Second
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formity is the
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Moons being
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cous as the Earth.
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Thirdly, The
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ter of the Moon is
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denſe and mo
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nous as the Earth.
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Fourthly, The
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Moon is
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guiſhed into two
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different parts for
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clarity and
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rity, as the
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strial Globe into
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Sea and Land.
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The ſurface of the
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Sea would ſhew at
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a diſtance more
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ſoure than that of
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the Earth.
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Fiftly,
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tion of ſigures in
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the Earth, like to
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thoſe of the Moon,
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and made with the
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ſame periods.
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<
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>SAGR. </
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<
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>Stay a little,
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Salviatus
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; That the illumination of
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the Earth, as to the ſeveral figures, would repreſent it ſelf to a perſon
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placed in the Moon, like in all things to that which we diſcover in
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the Moon, I underſtand very well, but yet I cannot conceive how
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it ſhall appear to be done in the ſame period; ſeeing that that
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which the Suns illumination doth in the Lunar ſuperficies in a
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month, it doth in the Terreſtrial in twenty four hours.</
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<
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<
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>Its true, the effect of the Sun about the illuminating
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theſe two bodies, and repleniſhing with its ſplendor their whole
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ſurfaces, is diſpatch'd in the Earth in a Natural day, and in the
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Moon in a Month; but the variation of the figures in which the </
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