• The Heaven of Saturn, where are seen the Spirits of the Contemplative. “This planet,” says Brunetto Latini, “is cruel, felonious, and of a cold nature.” Dante, Convito , II 14, makes it the symbol of Astrology:⁠— “The Heaven of Saturn,” he says, “has two properties by which it may be compared to Astrology. The first is the slowness of its movement through the twelve signs; for, according to the writings of Astrologers, its revolution requires twenty-nine years and more. The second is, that it is the highest of all the planets. And these two properties are in Astrology; for in completing its circle, that is, in learning it, a great space of time passes; both on account of its demonstrations, which are more than in any of the above-mentioned sciences, and on account of the experience which is necessary to judge rightly in it. And, moreover, it is the highest of all; for, as Aristotle says at the beginning of his treatise on the Soul, Science is of high nobility, from the nobleness of its subject, and from its certainty; and this more than any of the above-mentioned is noble and high, from its noble and high subject, which is the movement of the heavens; and high and noble from its certainty, which is without any defect, as one that proceeds from a most perfect and regular source.