The methods used by these archaeologists are also varied and seem to have their own reasons. For example, some scholars first verified the correct list of pharaohs, and then accumulated the time of their rule as an approximate representative of ancient Egypt. Some infer historical years according to some regular records of celestial movements. The starting year of the 18th dynasty was BC 1580, which was inferred from the appearance of Sirius recorded in ancient literature.

Recently, Kate, an expert in Egyptology at Cambridge University, UK? Spencer introduced her new method in the British magazine Nature. She creatively proposed that the orientation of ancient Egyptian pyramids was judged according to astrology. The connection between Kaiyang star on the handle of the Big Dipper and Kauchabel star on the spoon of the Little Dipper is the standard of north-south orientation of ancient Egyptians. However, due to the movement of celestial bodies, these two stars just pointed due south and due north in 2467 AD. There will be some deviation before and after. The deviation of specific year can be calculated according to the law of celestial motion. Take such a table to set the deviation of the actual building direction of the pyramid, and you can know the building year of the pyramid. According to the pyramid inscription, the age of Pharaoh is almost known.

It is said that the error of this method will not exceed 10 years.