The two most common calendars were the 260-day festival calendar and the 365-day solar calendar. The correlation between the two occurs every 52 years when both begin their new years. This is called ...

Ancient Egyptian: What have you got in this linen sack thing anyway? Oh, a calendar! Now that is useful. It’s similar to our own solar calendar which has 365 days in it. You do have bread at least!

At a temple site, the remains of an ancient Egyptian astronomical observatory ... and invented the 365-day calendar. Their solar calendar corresponded with the dates of special rites, such as ...