Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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greater and leſſer. </
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<
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>Now you ſee that the cauſe of the Monethly
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Period reſideth in the annual motion; and withal you ſee how
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much the Moon is concerned in this buſineſs, and how it is
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with interrupted apart, without having any thing to do with either,
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with Seas or Waters.</
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The Earths
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nual motion by the
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Ecliptick, unequal
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by means of the
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Moons motion.
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>SAGR. </
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>If one that never had ſeen any kinde of Stairs or
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der, were ſhewed a very high Tower, and asked if ever he hoped
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to climb to the top of it, I verily believe that he would anſwer he
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did not, not conceiving how one ſhould come thither any way
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except by flying; but ſhewing him a ſtone of but a foot high, and
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asking him whether he thought he could get to the top of that,
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I am certain that he would anſwer he could; and farther, that he
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would not deny, but that it was not onely one, but ten, twenty,
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and an hundred times eaſier to climb that: But now if he ſhould
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be ſhewed the Stairs, by means whereof, with the facility by him
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granted, it is poſſible to get thither, whither he a little before had
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affirmed it was impoſſible to aſcend, I do think that laughing at
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himſelf he would confeſs his dulneſs of apprehenſion. </
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>Thus,
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Salviatus,
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have you ſtep by ſtep ſo gently lead me, that, not
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without wonder, I finde that I am got with ſmall pains to that
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height which I deſpaired of arriving at. 'Tis true; that the
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caſe having been dark, I did not perceive that I was got nearer
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to, or arrived at the top, till that coming into the open Air I
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covered a great Sea, and ſpacious Country: And as in aſcending
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one ſtep, there is no labour; ſo each of your propoſitions by it
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ſelf ſeemed to me ſo plain, that thinking I heard but little or
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thing that was new unto me, I conceived that my benefit thereby
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had been little or none at all: Whereupon I was the more
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zed at the unexpected
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exit
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of this diſcourſe, that hath guided me
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to the knowledge of a thing which I held impoſſible to be
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monſtrated. </
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>One doubt onely remains, from which I deſire to
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be freed, and this it is; Whether that if the motion of the Earth
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together with that of the Moon under the Zodiack are irregular
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motions, thoſe irregularities ought to have been obſerved and
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ken notice of by
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Aſtronomers,
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which I do not know that they
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are: Therefore I pray you, who are better acquainted with theſe
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things than I, to free me from this doubt, and tell me how the
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caſe ſtands.</
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<
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>SALV. </
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<
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>You ask a rational queſtion, and anſwering to the
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jection, I ſay; That although
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Aſtronomy
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in the courſes of many
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ages hath made a great progreſs in diſcovering the conſtitution
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and motions of the Celeſtial bodies, yet is it not hitherto arrived
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at that height, but that very many things remain undecided, and
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haply many others alſo undiſcovered. </
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<
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>It is to be ſuppoſed that the
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firſt obſervers of Heaven knew no more but one motion common </
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