Egyptian chronology carbon dating
Reliable absolute dates, astronomical or other, are lacking, as Professor Heinrich Otten had noted.
It is a "rubber chronology" that you can stretch or shrink anywhere, by arbitrarily established lengths of co-regencies between rulers and even overlapping dynasties.
As evidence, interpretations of the historical chronology of ancient Egypt–which are generally based on historical documents and archeological findings–have been verified by radiocarbon dating, which uses the naturally occurring radioisotope carbon-14 to determine the age of organic remains from archeological sites.
In a recent study published in Science Magazine on 18 June 2010, an international team of nine research professors (French, Austrian and Israeli) led by Bronk Ramsey, director of Oxford Radiocarbon Accelerator Unit at the Oxford University, have apparently determined more accurate dates for the ruling dynasties of Ancient Egypt by analyzing 211 samples.
Yet the evidence supporting such a great age for the Egyptian state was highly dubious at best.
Moreover, an increasing body of evidence now suggests that the history of ancient Egypt is shorter, by several millennia, than most scholars have previously supposed.
Nevertheless, monumental evidence still has value—so long as one can date it reliably.
This leads to other problems: Despite the amount of guesswork and inaccuracies in the conventional chronology, its general outline and dates have not fluctuated very much in the last 100 years.
This can be seen by comparing the dates when Egypt's 30 dynasties began and ended from two different Egyptologists: the first writing in 1906, the second in 2000.
reached from his study of ancient sources, including the Bible: that the history of Egypt does not extend further back than the Great Flood, and that definite synchronies with Old Testament history do exist.
The evidence does not support the original synchronies that Ussher made, but instead suggests new ones.