there will therefore be the double number of this of stadii which the Sun is distant from the Moon, viz. 11,088,260. But the Sun is distant from the Earth 16,632,390 stadii; and Venus is likewise distant from the Sun 16,632,390 stadii, but from the Earth 33,264,780 stadii; and Mercury is distant from Venus 22,176,520 stadii, but from Earth 55,441,300 stadii; and Mars is distant from Mercury 49,897,170 stadii, and from Earth 105,338,470 stadii; and Jupiter is distant from Mars 44,353,040 stadii, but from Earth 149,691,510 stadii; Saturn is distant from Jupiter 149,691,510 stadii, but from Earth 299,383,020 stadii.
Chapter xii.
Waste of Mental Energy in the Systems of the Astrologers.
Who will not feel astonishment at the exertion of so much deep thought with so much toil? This Ptolemy, however—a careful investigator of these matters—does not seem to me to be useless; but only this grieves [one], that being recently born, he could not be of service to the sons of the giants, who, being ignorant of these measures, and supposing that the heights of heaven were near, endeavoured in vain to construct a tower. And so, if at that time he were present to explain to them these measures, they would not have made the daring attempt ineffectually. But if any one profess not to have confidence in this [astronomer's calculations], let him by measuring be persuaded [of their accuracy]; for in reference to those incredulous on the point, one cannot have a more manifest proof than this. O, pride of vain-toiling soul, and incredible belief, that Ptolemy should be considered preeminently wise among those who have cultivated similar wisdom!
Chapter xiii.
Mention of the Heretic Colarbasus—Alliance between Heresy and the Pythagorean Philosophy.
Certain, adhering partly to these, as if having propounded great conclusions, and supposed things worthy of reason, have
