Note 1 to "Deep History"

Only periodically, the Sahara was a green Sahara. Of at least three it is established the Sahara was green, 120,000-110,000, 50,000-45,000 and 10,000-8,000 years ago. The last period, the Neolithic subpluviale period, ended about six thousand years bce. The emergence of green periods is related to the position of the earth's axis, which varies by precession, and the way the jet stream, high speed winds, therefore increases. With its route the rain of the monsoon coincides. The migration route through northern Africa could only exist for early man during a green period. Of these three periods, man migrated at least during the last two, but possibly also the first. The periods were relatively short and faded relatively quickly, within two hundred years.
Not only the migration route of humans to the rest of the world via the Levant was related to the climatic phenomenon of a green Sahara. The final desertification of the Sahara had the origin of Egyptian civilization as a result. Saharan peoples migrated to the last remaining water, the Nile. According to data on satellite photos the Nile only since 8,000 bce runs in its present bed. Before, the river ran through the Sahara and ended in the Niger River and then into the Atlantic Ocean. The new course of the Nile drew the Saharans, when the Sahara again became desert. The first pharaohs had illustrious names as, Warrior King, King Fortress, King Cobra, King Butcher and the most illustrious of them all, King Scorpion. In his grave labels on amphorae were found showing the origin of hieroglyphs - around thirty-five hundred bce. Traditionally Egyptian history begins with the first dynasty, with Pharaoh Narmer, 3180-3120 bce. The "dynasty" of King Warrior and the Scorpion King that came before that period, therefore is called dynasty zero.

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