in Predynastic Egypt - Page 15
C. The Horus Falcon Names of the Egyptian Kings
1. The Horus Falcon Names are a Calendar of Kings:
The Calendar begins on December 25, 3117 B.C.
(= astronomically the year -3116).
The interpretation of the names of Egyptian kings has been a point of dispute among Egyptologists for quite some time. Our discovery that the Horus falcon marked heaven’s celestial pole in predynastic Egypt suggests that the Horus names of the Egyptian kings were astronomical in nature. We have found that these names of kings - written below the falcon in the serekh - claimed certain heavenly stellar regions as the king's realm of reign. These heavenly regions basically correspond to the modern Zodiac in principle, delineating a particular part of the heavens. The Horus names of kings were therefore a type of calendar of kings. Using that calendar, one can determine the reigns of the early Pharaonic kings astronomically.
Start of the calendar
Figure 9: The solar eclipse of December 25, 3117 B.C.
It took place at sunrise on the day of the winter-solstice, an auspicious event that well-served to mark the start of time recordation. This eclipse is dated according to Starry Night Pro 3, but not by later versions of that software astronomy program since Delta T appears to have been changed by the programmers in the interim and made less accurate than it was. The Delta-T value is disputed among astronomers, but it gives changing values over time for the rate of spin of the Earth, which rate affects the exact time and location of ancient solar eclipses, whose accuracy is therefore not accepted by mainstream astronomers much beyond about 600BC. Based on the material following, we think this eclipse is confirmed in the Egyptian sources.
 See Jürgen von Beckerath, Handbuch der ägyptischen Königsnamen, 2nd ed., von Zabern, Mainz, 1999.
 Starry Night Pro 3.