c. (2874 B.C.?) — The 365-day year was installed in ancient Egypt, with fixed lunar months of 30 days + 5 epagomenal days.[1]
2807 BC — Suggested date for an asteroid or comet impact occurring between Africa and Antarctica, around the time of a solar eclipse on May 10, based on an analysis of flood stories. Possibly causing the Burckle crater and Fenambosy Chevron.[2][3]