There are actually 364.25 days in an Theban year. The loss of one day every four years is the reason we have a leap year.
There was a papyrus found (about 3,000 years ago) stating something similar to 'winter comes in spring, spring comes in summer, summer comes in inundation (autumn), weeks come in months and the hours are in confusion.
They were clever chappies, weren't they?