I trust the tropical Age timeline, which makes 3100 B.C.E. the most probable date for the First Dynasty, +/- about 100 years.
Similarly, I place the Exodus around 1350 B.C.E., which is when the tropical Age of the Water-sign Scorpio changed to Fire-sign Sagittarius. The Ancient Egyptian culture was a product of the Water-sign Age, so that symbolizes why the Pharoah's army couldn't follow them across the Red Sea.
The Hellenistic Age is synchronistic with the Age of Sagittarius, just as the Church Age corresponds to the tropical Age of Capricorn. The time of Jesus was during the spiritual, visionary Age of Sagittarius. The rise to power of the religious intitution based on his teachings was far more materialistic than what he was really about, since it was a manifestation during an Earth-sign Age. 400 A.D. shows a clear demarcation between those two Ages.
The full impact of this Saturnian-ruled, Earth-sign Age, is the new technology and a lack of belief in the human Soul. That took about 1400 years to emerge against the resistance of the background Age of Sagittarius, which incorporates the entire Fall Season of Ages.
The Aquarian Age will be a continuation of this Winter Season of Ages, now dominating the world. However it will also mean a return to the spiritual plane of reality, from the perspective of an Air-sign, ruled by a planet named for the Heavens (the Uran- prefix refers to the Heavens).