Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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nor a leſſe mutation being diſcerned in the fixed Stars, methinks
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that by this means the annual motion of the Earth is deſtroyed
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and overthrown.</
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<
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>SALV. </
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>You might very well ſo conclude,
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Simplicius,
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if we
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had nothing elſe to ſay in behalf of
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Copernicus
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: but we have
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many things to alledge that yet have not been mentioned; and
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as to that your reply, nothing hindereth, but that we may
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poſe the diſtance of the fixed Stars to be yet much greater than
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that which hath been allowed them, and you your ſelf, and
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ever elſe will not derogate from the propoſitions admitted by
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Piolomy
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's ſectators, muſt needs grant it as a thing moſt requiſite
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to ſuppoſe the Starry Sphere to be very much bigger yet than
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that which even now we ſaid that it ought to be eſteemed. </
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all Aſtronomers agreeing in this, that the cauſe of the greater
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tardity of the Revolutions of the Planets is, the majority of
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their Spheres, and that therefore
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Saturn
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is more flow than
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piter,
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and
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Jupiter
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than the Sun, for that the firſt is to deſcribe a
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greater circle than the ſecond, and that than this later, &c. </
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ſidering that
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Saturn v.g.
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the altitude of whoſe Orb is nine times
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higher than that of the Sun, and that for that cauſe the time of
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one Revolution of
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Saturn,
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is thirty times longer than that of a
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converſion of the Sun, in regard that according to the Doctrine
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of
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Ptolomy,
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one converſion of the ſtarry Sphere is finiſhed in
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36000. years, whereas that of
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Saturn
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is conſummate in thirty,
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and that of the Sun in one, arguing with a like proportion, and
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ſaying, if the Orb of
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Saturn,
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by reaſon it is nine times bigger
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than that of the Sun, revolves in a time thirty times longer, by
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converſion, how great ought that Orb to be, which revolves
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36000. times more ſlowly? </
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the ſtarry Sphere ought to be 10800 ſemidiameters of the grand
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Orb, which ſhould be full five times bigger than that, which even
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now we computed it to be, in caſe that a fixed Star of the ſixth
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magnitude were equal to the Sun. </
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<
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>Now ſee how much leſſer yet,
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upon this account, the variation occaſioned in the ſaid Stars, by
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the annual motion of the Earth, ought to appear. </
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ſame rate we would argue the diſtance of the ſtarry Sphere from
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Jupiter,
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and from
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Mars,
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that would give it us to be 15000. and
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this 27000 ſemidiameters of the grand Orb, to wit, the firſt
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ſeven, and the ſecond twelve times bigger than what the
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nitude of the fixed Star, ſuppoſed equal to the Sun, did make
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it.</
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All
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mers agree that
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the greater
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tudes of the Orbes
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is the cauſe of the
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tardity of the
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verſions.
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By another
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poſition taken from
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Aſtronomers, the
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diſtance of the
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ed Stars is
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lated to be 10800
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ſemidiameters of
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the grand Orb.
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By the proportion
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of
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Jupiter
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and of
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Mais,
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the ſtarry
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Sphere is found to
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be yet more remote.
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<
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>SIMP. </
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<
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>Methinks that to this might be anſwered, that the
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tion of the ſtarry Sphere hath, ſince
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Ptolomy,
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been obſerved not
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to be ſo ſlow as he accounted it; yea, if I miſtake. </
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<
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heard that
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Copernicus
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himſelf made the Obſervation.</
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