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To this I thus answered: This instance is rather alleged obstinately against the name, than naturally or mathematically against the thing. For if one will not call the place obfuscated by the opposition of the earth a shadow, but a place deprived of light, yet be it what it will, you must of necessity confess that the moon being there becomes obscure; and every way, said I, it is a folly to deny that the shadow of the earth reaches thither from whence the shadow of the moon, falling upon our sight here on earth, causes the eclipse of the sun. And therefore I now address myself to you, Pharnaces; for this coal-like and burnt color of the moon, which you affirm to be proper to her, belongs to a body that has thickness and depth. For there is not wont to remain any relic, mark, or print of flame in a body that is rare, nor can a coal be made where there is not a solid body which may receive into it the heat of the fire; as Homer himself shows in a certain passage, where he says, Then, when the languid flames at length subside, He strows a bed of glowing embers wide. Il. IX. 212. For the coal seems not properly a fire, but a body enkindled and altered by the fire, which stays and remains in a solid firmly rooted mass; and whereas flames are the setting on fire and fluxions of a nutriment and matter, which is of a rare substance, and by reason of its weakness quickly dissolved and consumed; so that there could not be any more evident and plain argument to demonstrate that the moon is solid and earthly, than if ’her proper color were that of a coal. But it is not so, my friend Pharnaces; but in her eclipses she diversely changes her colors, which the mathematicians, determining with respect to the time and hour, thus distinguish. If she is eclipsed in the evening, she appears horribly black until the middle of the fourth hour of the night; if about midnight, she sends forth this reddish and fire-resembling color, and after the middle of the eighth hour, the redness disappears; and finally, if about the dawning of the morning, she takes a blue or grayish color; which is the cause why she is by the poets, and particularly by Empedocles, called Glaucopis.
