After the study of Astronomy was set on foot for the use of navigation, and the Egyptians by the Heliacal Risings and Settings of the Stars had determined the length of the Solar year of 365 days, and by other observations had fixed the Solstices, and formed the fixt Stars into Asterisms, all which was done in the Reign of Ammon, Sesac, Orus, and Memnon; it may be presumed that they continued to observe the motions of the Planets; for they called them after the names of their Gods; and Nechepsos or Nicepsos King of Sais, by the assistance of Petosiris a Priest of Egypt, invented Astrology, grounding it upon the aspects of the Planets, and the qualities of the men and women to whom they were dedicated:  and in the beginning of the Reign of Nabonassar King of Babylon, about which time the Ethiopians under Sabacon invaded Egypt, those Egyptians who fled from him to Babylon, carried thither the Egyptian year of 365 days, and the study of Astronomy and Astrology, and founded the AEra of Nabonassar; dating it from the first year of that King’s Reign, which was the 22d year of Bocchoris as above, and beginning the year on the same day with the Egyptians for the sake of their calculations.  So Diodorus [337]:  they say that the Chaldaeans_ in Babylon, being Colonies of the Egyptians, became famous for Astrology, having learnt it from the Priests of Egypt_:  and Hestiaeus, who wrote an history of Egypt, speaking of a disaster of the invaded Egyptians, saith [338] that the Priests who survived this disaster, taking with them the Sacra_ of Jupiter Enyalius, came to Sennaar in Babylonia_.  From the 15th year of Asa, in which Zerah was beaten, and Menes or Amenophis began his Reign, to the beginning of the AEra of Nabonassar, were 200 years; and this interval of time allows room for about nine or ten Reigns of Kings, at about twenty years to a Reign one with another; and so many Reigns there were, according to the account set down above out of Herodotus; and therefore that account, as it is the oldest, and was received by Herodotus from the Priests of Thebes, Memphis, and Heliopolis, three principal cities of Egypt, agrees also with the course of nature, and leaves no room for the Reigns of the many nameless Kings which we have omitted.  These omitted Kings Reigned before Moeris, and by consequence at Thebes; for Moeris translated the seat of the Empire from Thebes to Memphis:  they Reigned after Ramesses; for Ramesses was the son and successor of Menes, who Reigned next after the Gods.  Now Menes built the body of the Temple of Vulcan, Ramesses the first portico, and Moeris the second portico