“The Crystalline Heaven, which has previously been called the Primum Mobile, has a very manifest resemblance to Moral Philosophy; for Moral Philosophy, as Thomas says in treating of the second book of the Ethics, directs us to the other sciences. For, as the Philosopher says in the fifth of the Ethics, legal justice directs us to learn the sciences, and orders them to be learned and mastered, so that they may not be abandoned; so this heaven directs with its movement the daily revolutions of all the others, by which daily they all receive here below the virtue of all their parts. For if its revolution did not thus direct, little of their virtues would reach here below, and little of their sight. Hence, supposing it were possible for this ninth heaven to stand still, the third part of heaven would not be seen in each part of the earth; and Saturn would be hidden from each part of the earth fourteen years and a half; and Jupiter, six years; and Mars, almost a year; and the Sun, one hundred and eighty-two days and fourteen hours (I say days, that is, so much time as so many days would measure); and Venus and Mercury would conceal and show themselves nearly as the Sun; and the Moon would be hidden from all people for the space of fourteen days and a half.