Anaximander says, that the sun is a circle eight and twenty times bigger than the earth, and has a circumference very much like that of a chariot-wheel, which is hollow and full of fire; the fire of which appears to us through its mouth, as by an aperture in a pipe; and this is the sun. Xenophanes, that the sun is constituted of small bodies of fire compacted together and raised from a moist exhalation, which condensed make the body of the sun; or that it is a cloud enfired. The Stoics, that it is an intelligent flame proceeding from the sea. Plato, that it is composed of abundance of fire. Anaxagoras, Democritus, and Metrodorus, that it is an enfired stone, or a burning body. Aristotle, that it is a sphere formed out of the fifth body. Philolaus the Pythagorean, that the sun shines as crystal, which receives its splendor from the fire of the world and so reflecteth its light upon us; so that first, the body of fire which is celestial is in the sun; and secondly, the fiery reflection that comes from it, in the form of a mirror; and lastly, the rays spread upon us by way of reflection from that mirror; and this last we call the sun, which is (as it were) an image of an image. Empedocles, that there are two suns; the one the prototype, which is a fire placed in the other hemisphere, which it totally fills, and is always ordered in a direct opposition to the reflection of its own light; and the sun which is visible to us, formed by the reflection of that splendor in the other hemisphere (which is filled with air mixed with heat), the light reflected from the circular sun in the opposite hemisphere falling upon the crystalline sun; and this reflection is borne round with the motion of the fiery sun. To give briefly the full sense, the sun is nothing else but the light and brightness of that fire which encompasseth the earth. Epicurus, that it is an earthy bulk well compacted, with ores like a pumice-stone or a sponge, kindled by fire. CHAPTER XXI. OF THE MAGNITUDE OF THE SUN. Anaximander says, that the sun itself in greatness is equal to the earth, but that the circle from whence it receives its respiration and in which it is moved is seven and twenty times larger than the earth. Anaxagoras, that it is far greater than Peloponnesus. Heraclitus, that it is no broader than a man's foot. Epicurus, that he equally embraceth all the foresaid opinions,--that the sun may be of magnitude as it appears, or it may be somewhat greater or somewhat less. CHAPTER XXII. WHAT IS THE FIGURE OR SHAPE OF THE SUN. Anaximenes affirms that in its dilatation it resembles a leaf. Heraclitus, that it hath the shape of a boat, and is somewhat crooked. The Stoics, that it is spherical, and it is of the same figure with the world and the stars. Epicurus, that the recited dogmas may be defended. CHAPTER XXIII. OF THE TURNING AND RETURNING OF THE STARS, OR THE SUMMER AND WINTER SOLSTICE.