Chapter XXIV: Of the Eclipse of the Sun

Thales was the first who affirmed that the eclipse of the sun was caused by the moon's running in a perpendicular line between it and the world; for the moon in its own nature is terrestrial. And by mirrors it is made perspicuous that, when the sun is eclipsed, the moon is in a direct line below it. Anaximander, that the sun is eclipsed when the fiery mouth of it is stopped and hindered from respiration. Heraclitus, that it is after the manner of the turning of a boat, when the concave seems uppermost to our sight, and the convex nethermost. Xenophanes, that the sun is eclipsed when it is extinguished; and that a new sun is created and rises in the east. He gives a farther account of an eclipse of the sun which remained for a whole month, and again of an eclipse which changed the day into night. Some declare that the cause of an eclipse is the invisible concourse of condensed clouds which cover the orb of the sun. Aristarchus placeth the sun amongst the fixed stars, and believeth that the earth [the moon?] is moved about the sun, and that by its inclination and vergency it intercepts its light and shadows its orb. Xenophanes, that there are many suns and many moons, according as the earth is distinguished by climates, circles, and zones. At some certain times the orb of the sun, falling upon some part of the world which is untenanted, wanders in a vacuum and becomes eclipsed. The same person affirms that the sun proceeding in its motion in the infinite space, appears to us to move orbicularly, taking that representation from its infinite distance from us.

CHAPTER XXV. OF THE ESSENCE OF THE MOON.

Anaximander affirms that the circle of the moon is nineteen times bigger than the earth, and resembles the sun, its orb being full of fire; and it suffers an eclipse when the wheel makes a revolution,--which he describes by the divers turnings of a chariot-wheel, in the midst of it there being a hollow nave replenished with fire, which hath but one way of expiration. Xenophanes, that it is a condensed cloud. The Stoics, that it is mixed of fire and air. Plato, that it is a body of the greatest part fiery. Anaxagoras and Democritus, that it is a solid, condensed, and fiery body, in which there are flat countries, mountains, and valleys. Heraclitus, that it is an earth covered with a bright cloud. Pythagoras, that the body of the moon was of a nature resembling a mirror.

CHAPTER XXVI. OF THE SIZE OF THE MOON.

The Stoics declare, that in magnitude it exceeds the earth, just as the sun itself doth. Parmenides, that it is equal to the sun, from whom it receives its light.

CHAPTER XXVII. OF THE FIGURE OF THE MOON.

The Stoics believe that it is of the same figure with the sun, spherical. Empedocles, that the figure of it resembles a quoit. Heraclitus, a boat. Others, a cylinder.

CHAPTER XXVIII. FROM WHENCE IS IT THAT THE MOON RECEIVES HER LIGHT?

Anaximander thinks that she gives light to herself, but it is very slender and faint. Antiphon, that the moon shines by its own proper light; but when it absconds itself, the solar beams darting on it obscure it. Thus it naturally happens, that a more vehement light puts out a weaker; the same is seen in other stars. Thales and his followers, that the moon borrows all her light of the sun. Heraclitus, that the sun and moon are after the same manner affected; in their configurations both are shaped like boats, and are made conspicuous to us by receiving their light from moist exhalations. The sun appears to us more refulgent, by reason it is moved in a clearer and purer air; the moon appears more duskish, it being carried in an air more troubled and gross.