aristotle vs. galileo first paper

aristotle vs. galileo first paper - Crider Cardinal 2...

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Crider 9/29/07 Cardinal 2: Aristotle’s incorrect assumptions of the Universe Aristotle makes multiple assumptions pertaining to the motion, compilation, and orientation of the universe which are incorrect. Aristotle’s On the Heavens, depicts the eternality of the heavens, the notion of only one universe, and the idea that the heavens do not decay or change in any way. Galileo’s ideas and notions which generally refute those of Aristotle are much more plausible and generally correct. I shall begin by explaining Aristotle’s evaluations and conclusions. One of the most important observations Aristotle claims is that all things on earth are subject to change, in contrast to the unchanging and perpetual realm of the heavens. One of the key pieces to the uniqueness of the heavenly realm pertains to Aristotle’s claim that up and down are the natural motions of the four elements of the earth whereas circular motion “must belong to some other body since this motion is eternal and unchanging.” The line of division which separates the two realms, Aristotle contends, lies within the orbit of the Moon. According to Aristotle “the circle is a perfect thing,” perfect meaning complete; “this cannot be said of any straight line.” Aristotle defines this matter which can only be found in the heavens to be called “ether.” He asserts that ether can only be discovered in the Heavens because no change has ever been recorded in the Heavens. Moreover, the heavens must fit perfectly together which will allow for the spherical earth to be at center (thus supported by the idea of natural motions). This notion is furthered by the assumption that “it is equally reasonable that the body will be ungenerated and indestructible and exempt from increase and alteration.”
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Another key argument of Aristotle states that the Heavens must be of a finite size, supported by the idea that if the universe were of infinite proportions it would take an infinite
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aristotle vs. galileo first paper - Crider Cardinal 2...

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