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3Hence from the construction, the polar centre is raised above the earth in the northern part, whilst that in the southern part, which is underneath, is hidden from our view by the earth, and through the middle obliquely and inclined to the south, is a large band comprising the twelve signs, which, by the varied combination of the stars being divided into twelve equal parts, contains that number of representations of figures. These are luminous, and with the firmament and the other stars and constellations, make their circuit round the earth and sea;
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