Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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velocity, to perform that, which might be done by the moderate
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motion of one alone about its own Centre?</
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The firſt diſcourſe
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to prove that the
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diurnal motion
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longs to the Earth.
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Nature never
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doth that by many
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things, which may
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be done by a few.
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<
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>SIMPL. </
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>I do not well underſtand, how this grand motion
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niſieth nothing as to the Sun, as to the Moon, as to the other
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nets, and as to the innumerable multitude of fixed ſtars: or why
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you ſhould ſay that it is to no purpoſe for the Sun to paſs from one
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Meridian to another; to riſe above this Horizon, to ſet beneath
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that other; to make it one while day, another while night: the
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like variations are made by the Moon, the other Planets, and the
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fixed ſtars themſelves.</
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>All theſe alterations inſtanced by you, are nothing, ſave
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onely in relation to the Earth: and that this is true, do but
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magine the Earth to move, and there will be no ſuch thing in the
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World as the riſing or ſetting of the Sun or Moon, nor Horizons,
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nor Meridians, nor days, nor nights; nor, in a word, will ſuch a
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motion cauſe any mutation between the Moon and Sun, or any
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other ſtar whatſoever, whether fixed or erratick; but all theſe
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changes have relation to the Earth: which all do yet in ſum
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import no other than as if the Sun ſhould ſhew it ſelf now to
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China,
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anon to
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Perſia,
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then to
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Egypt, Greece, France, Spain,
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merica, &c.
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and the like holdeth in the Moon, and the reſt of the
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Cœleſtial Bodies: which ſelf ſame effect falls out exactly in the
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ſame manner, if, without troubling ſo great a part of the Univerſe,
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the Terreſtrial Globe be made to revolve in it ſelf. </
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<
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>But we will
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augment the difficulty by the addition of this other, which is a
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very great one, namely, that if you will aſcribe this
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Great
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Motion to
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Heaven, you muſt of neceſſity make it contrary to the particular
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motion of all the Orbs of the Planets, each of which without
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controverſie hath its peculiar motion from the Weſt towards the
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Eaſt, and this but very eaſie and moderate: and then you make
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them to be hurried to the contrary part,
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i. </
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>e.
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from Eaſt to Weſt,
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by this moſt furious diurnal motion: whereas, on the contrary,
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making the Earth to move in it ſelf, the contrariety of motions is
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taken away, and the onely motion from Weſt to Eaſt is
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modated to all appearances, and exactly ſatisfieth every
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menon.
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The diurnal
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tion cauſeth no
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mutation amongſt
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the Cœleſtial
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dies, but all
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ges have relation
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to the Earth.
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A ſccond
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firmation that the
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diurnal motion
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longs to the Earth.
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<
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>SIMPL. </
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>As to the contrariety of Motions it would import
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tle, for
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Ariſtotle
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demonſtrateth, that circular motions, are not
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trary to one another; and that theirs cannot be truly called
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trariety.</
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Circular
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ons are not
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ry, according to
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Ariſtotle.</
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<
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<
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>SALV. </
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<
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>Doth
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Ariſtotle
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demonſtrate this, or doth he not rather
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barely affirm it, as ſerving to ſome certain deſign of his? </
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<
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>If
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traries be thoſe things, that deſtroy one another, as he himſelf
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affirmeth, I do not ſee how two moveables that encounter each
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other in a circular line, ſhould leſſe prejudice one another, than if
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they interfered in a right line.</
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