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— Thomas Aquinas"If... the motion of the earth were circular, it would be violent and contrary to nature, and could not be eternal, since ... nothing violent is eternal .... It follows, therefore, that the earth is not moved with a circular motion."
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I see the experience of pictures as a kind of cycle, a kind of circular motion in which you're in the world, then you enter the picture and you're in a different world (it's not the same as the one you live in, but recognizable as one you might live in). And then you're returned to your world with an enlarged sense of its possibilities.
— Frank Gohlke
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The charge that the construction of the geologic scale involves circularity has a certain amount of validity. ...Thus, the procedure is far from ideal and the geologic ranges are constantly being revised (usually extended) as new occurrences are found.
— David M. Raup
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