Precession

from.. http://en.wikipedia.org/wiki/Zep_Tepi

Zep Tepi ("First Time") is a period in Ancient Egyptian beliefs.  It is the mythological golden age when the gods lived amongst humanity together with half-divine offspring of gods and humans.

James Henry Breasted (1906, 1962). Ancient Records of Egypt:

The Book of the Kings of Egypt: Dynasties I-XIXBy Sir Ernest Alfred Wallis Budge