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Chapter XII.THALES, Pythagoras, and the followers of Pythagoras do distribute the universal globe of heaven into five circles, [p. 138] which they denominate zones; one of which is called the arctic circle, which is always conspicuous to us, another is the summer tropic, another is the equinoctial, another is the winter tropic, another is the antarctic circle, which is always invisible. The circle called the zodiac is placed under the three that are in the midst, and lies obliquely, gently touching them all. Likewise, they are all cut in right angles by the meridian, which runs from pole to pole. It is supposed that Pythagoras made the first discovery of the obliquity of the zodiac, but one Oenopides of Chios challenges to himself the invention of it.
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