If we now first consider this era, we find a considerable divergence of opinion regarding it among these nations. For the Persians and Magians think that the duration of the world is 12,000 years, corresponding to the number of signs in the zodiac and of the months; and that Zoroaster, the founder of their law, thought that of those there had passed, till the time of his appearance, 3,000 years, intercalated with the day-quarters, for he himself had made their computation, and had taken into account that defect, which had accrued to them on account of the day-quarters, till the time when they were intercalated and made to agree with real time. From his appearance to the beginning of the Aera Alexandri, they count 258 years; therefore they count from the beginning of the world to Alexander 3,258 years. However, if we compute the years from the creation of Gayomarth, whom they hold to be the first man, and sum up the years of the reign of each of his successors—for the rule of Iran remained with his descendants without interruption—this number is, for the time till Alexander, the sum total of 3,354 years. So the specification of the single items of the addition does not agree with the sum total.
A section of the Persians is of the opinion that those past 3,000 years which we have mentioned are to be counted from the creation of Gayomarth; because, before that, already six thousand years had elapsed—a time during which the celestial globe stood motionless, the natures (of created beings) did not interchange, the elements did not mix—during which there was no growth, and no decay, and the earth was not cultivated. Thereupon, when the celestial globe was set a-going, the first man came into existence on the equator, so that part of him in longitudinal direction was on the north, and part south of the line. The animals were reproduced, and mankind commenced to reproduce their own species and to multiply; the atoms of the elements mixed, so as to give rise to growth and decay; the earth was cultivated, and the world was arranged in conformity with fixed forms.
The Jews and Christians differ widely on this subject; for, according to the doctrine of the Jews, the time between Adam and Alexander is 3,448 years, whilst, according to the Christian doctrine it is 5,180 years. The Christians reproach the Jews with having diminished the number of years with the view of making the appearance of Jesus fall into the fourth millennium in the middle of the seven millennia, which are, according to their view, the time of the duration of the world, so as not to coincide with that time at which, as the prophets after Moses had prophesied, the birth of Jesus from a pure virgin at the end of time, was to take place.