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16The reason why some planets are temperate, some hot, and others cold, appears to be this; that all fire has a flame, whose tendency is upward. Hence the sun warms, by his rays, the air above him, wherein Mars moves, and that planet is therefore heated thereby. Saturn, on the contrary, who is near the extremity of the universe, and comes in contact with the frozen regions of the heavens, is exceedingly cold. Jupiter, however, whose orbit lies between those of the two just mentioned, is tempered by the cold and heat, and has an agreeable and moderate temperature. Of the band comprising the twelve signs, of the seven planets, and their contrary motions and orbits, also of the manner and time in which they pass from one sign into another, and complete their circuits, I have set forth all that I have learnt from authors. I will now speak of the moon’s increase and wane, as taught by the antients.
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