Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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to all the Stars, as is this diurnal one: yet I believe that in few
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dayes they perceived that the Moon was inconſtant in keeping
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company with the other Stars; but yet withal, that many years
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paſt, before that they diſtinguiſhed all the Planets: And in
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ticular, I conceit that
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Saturn
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by its ſlowneſs, and
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Mercury
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by
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ſon of its ſeldom appearing, were the laſt that were obſerved to
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be wandring and errant. </
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>It is to be thought that many more
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years run out before the ſtations and retrogradations of the three
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ſuperiour Planets were known, as alſo their approximations and
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receſſions from the Earth, neceſſary occaſions of introducing the
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Eccentrix and Epicicles, things unknown even to
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Ariſtotle,
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for
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that he makes no mention thereof.
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Mercury,
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and
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Venus,
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with
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their admirable apparitions; how long did they keep
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mers in ſuſpence, before that they could reſolve (not to ſpeak of
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any other of their qualities) upon their ſituation? </
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that the very order onely of the Mundane bodies, and the
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gral ſtructure of the parts of the Univerſe by us known, hath been
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doubted of untill the time of
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Copernicus,
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who hath at laſt given
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us notice of the true conſtitution, and real ſyſteme, according to
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which thoſe parts are diſpoſed; ſo that at length we are certain
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that
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Mercury, Venus,
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and the other Planets do revolve about
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the Sun; and that the Moon revolveth about the Earth. </
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>But
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how each Planet governeth it ſelf in its particular revolution, and
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how preciſely the ſtructure of its Orb is framed; which is that
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which is vulgarly called the
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Theory
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of the
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Planets,
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we cannot as
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yet undoubtedly reſolve.
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Mars,
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that hath ſo much puzled our
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Modern Aſtronomers, is a proof of this: And to the Moon her
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ſelf there have been aſſigned ſeveral Theories, after that the ſaid
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Copernicus
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had much altered it from that of
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Ptolomy.
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And to
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deſcend to our particular caſe, that is to ſay, to the apparent
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tion of the Sun and Moon; touching the former, there hath been
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obſerved a certain great irregularity, whereby it paſſeth the two
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ſemicircles of the Ecliptick, divided by the points of the
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noxes in very different times; in paſſing one of which, it
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eth about nine dayes more than in paſſing the other; a difference,
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as you ſee, very great and notable. </
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>But if in paſſing ſmall arches,
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ſuch for example as are the twelve Signs, he maintain a moſt
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gular motion, or elſe proceed with paces, one while a little more
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ſwift, and another more ſlow, as it is neceſſary that it do, in caſe
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the annual motion belong to the Sun onely in appearance, but
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in reality to the Earth in company with the Moon, it is what hath
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not hitherto been obſerved, nor it may be, ſought. </
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<
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>Touching
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the Moon in the next place, whoſe reſtitutions have been
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cipally lookt into an account of the Eclipſes, for which it is
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ficient to have an exact knowledge of its motion about the Earth, </
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