The Egyptian Calendar is central to the debate regarding the date of the Alantean war. At first sight it appears that Plato dated that event to 9,000 years prior to Solon’s visit to Egypt. However, since such a date conflicts with both archaeology and common sense, commentators have striven to reconcile the differences. Either the number is exaggerated, the unit of measurement is wrong, or both require revision. I’m inclined towards the latter.
The ancient Egyptians had three types of ‘years’, solar, lunar or seasonal(a). The first was based on the heliacal rising(b) of the star Sirius, the second was a count of the annual lunar cycles and the last was the number of seasons of which there were three in the Egyptian year. The lunar cycles or months were the means by which the Egyptian priesthood calculated the passage of time and since Solon received the story of Atlantis from Egyptian priests it is assumed by many that the 9,000 ‘years’ were in fact months. Apart from modern authorities, the use of lunar cycles by the Egyptians for calculating time was noted by Eudoxus of Cnidos (410- 355 BC) and also by Plutarch, Manetho, Herodotus and Diodorus Siculus.
Some others, such as Radek Brychta and Rosario Vieni, have proposed that the number of seasons were used in a similar manner. Even more extreme was the contention of André de Paniagua who claimed that the date of Atlantis was recorded in Sothic cycles of 1,460 solar years each, which would push its time back 13 million years!
Nevertheless, there are many who still maintain that Plato’s 9,000 should be taken literally, even though neither Egypt nor Athens existed as structured societies at such an early date!