[224] But men, being unable completely to comprehend the arrangement of the planets (and in fact what other of the heavenly bodies can they understand with certainty and clearness?) speak according to their conjectures. And these persons appear to me to form the best conjectures on such subjects, who, having assigned the central position to the sun, say that there is an equal number of planets, namely, those above him and below him. Those above him being Saturn, Jupiter, and Mars; then comes the Sun himself, and next to him Mercury, Venus, and the Moon, which last is close to the air.