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Redefining Reality - The Intellectual Implications of Modern Science

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Thus, Aristotle’s prime mover, the ultimate cause <strong>of</strong> the circular<br />

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<strong>The</strong> questioning <strong>of</strong> this Aristotelian worldview was the hallmark<br />

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recognized that Ptolemy’s description <strong>of</strong> the heavens, based on an<br />

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from the center <strong>of</strong> the universe and having it and the other planets<br />

orbit the Sun.<br />

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Not having the Earth as the center <strong>of</strong> creation was a heretical<br />

denial <strong>of</strong> Aristotle and an insult to God’s creation, but this view<br />

became increasingly popular among the educated. In his book<br />

<strong>The</strong> Starry Messenger, Galileo Galilei<br />

documented all the observations he<br />

made that contradicted Aristotle. For<br />

example, his detailed drawings <strong>of</strong> the<br />

mountains and craters <strong>of</strong> the Moon<br />

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Moon is made <strong>of</strong> aether and, therefore,<br />

perfectly spherical.<br />

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Johannes Kepler, a contemporary <strong>of</strong><br />

Galileo, used the data <strong>of</strong> the Dutch<br />

astronomer Tycho Brahe to establish<br />

an account <strong>of</strong> planetary motion that rid<br />

astronomy <strong>of</strong> the epicycles. By trial and<br />

error, Kepler discovered that elliptical<br />

orbits with the Sun at one focus would<br />

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three numerical laws setting out not<br />

only the shape <strong>of</strong> the orbits but relations<br />

between the distance from the Sun and<br />

the period <strong>of</strong> revolution.<br />

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© Chris Hill/iStock/Thinkstock.<br />

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