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2By the world is meant the whole system of nature together with the firmament and its stars. This continually turns round the earth and sea on the extreme points of its axis, for in those points the natural power is so contrived that they must be considered as centres, one above the earth and sea at the extremity of the heavens by the north stars, the other opposite and below the earth towards the south; moreover in these central points as round the centres of wheels, which the Greeks call πόλοι, the heavens perpetually revolve. Thus the earth and sea occupy the central space.
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