Xenocrates says that the stars are moved in one and the same superficies. The other Stoics say that they are moved in various superficies, some being superior, others inferior. Democritus, that the fixed stars are in the highest place; after those the planets; after which the sun, Venus, and the moon, in their order. Plato, that the first after the fixed stars that makes its appearance is Phaenon, the star of Saturn; the second Phaëton, the star of Jupiter; the third the fiery, which is the star of Mars; the fourth the morning star, which is the star of Venus the fifth the shining star, and that is the star of Mercury; in the sixth place is the sun, in the seventh the moon. Plato and some of the mathematicians conspire in the same opinion; others place the sun as the centre of the planets. Anaximander, Metrodorus of Chios, and Crates assign to the sun the superior place, after him they place the moon, after them the fixed stars and planets. CHAPTER XVI. OF THE MOTION AND CIRCULATION OF THE STARS. Anaxagoras, Democritus, and Cleanthes say that all the stars have their motion from east to west. Alcmaeon and the mathematicians, that the planets have a contrary motion to the fixed stars, and in opposition to them are carried from the west to the east. Anaximander, that they are moved by those circles and spheres on which they are placed. Anaximenes, that they are turned under and about the earth. Plato and the mathematicians, that the sun, Venus, and Mercury have equal measures in their motions. CHAPTER XVII. WHENCE DO THE STARS RECEIVE THEIR LIGHT? Metrodorus says that all the fixed stars derive their light from the sun. Heraclitus and the Stoics, that earthly exhalations are those by which the stars are nourished. Aristotle, that the heavenly bodies require no nutriment, for they being eternal cannot be obnoxious to corruption. Plato and the Stoics, that the whole world and the stars are fed by the same things. CHAPTER XVIII. WHAT ARE THOSE STARS WHICH ARE CALLED THE DIOSCURI, THE TWINS, OR CASTOR AND POLLUX? Xenophanes says that those which appear as stars in the tops of ships are little clouds shining by their peculiar motion. Metrodorus, that the eyes of frighted and astonished people emit those lights which are called the Twins. CHAPTER XIX. HOW STARS PROGNOSTICATE, AND WHAT IS THE CAUSE OF WINTER AND SUMMER. Plato says that the summer and winter indications proceed from the rising and setting of the stars, that is, from the rising and setting of the sun, the moon, and the fixed stars. Anaximenes, that the others in this are not at all concerned, but that it is wholly performed by the sun. Eudoxus and Aratus assign it in common to all the stars, for thus Aratus sings: Thund’ring Jove stars in heaven hath fixed, And them in such beauteous order mixed, Which yearly future things predict. CHAPTER XX. OF THE ESSENCE OF THE SUN.