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Chapter XIV.PYTHAGORAS says that, as the celestial sphere is distributed into five zones, into the same number is the terrestrial; which zones are the arctic and antarctic, the summer and winter tropics (or temperate zones), and [p. 157] the equinoctial; the middle of which zones equally divides the earth and constitutes the torrid zone; but that part which is in the middle of the summer and winter tropics is habitable, by reason the air is there temperate.
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