The earliest Egyptian calendar was based on the moon's cycles, but the lunar calendar failed to predict a critical event in their lives: the annual flooding of the Nile river. The Egyptians soon noticed that the first day the "Dog Star," which we call Sirius, in Canis Major was visible right before sunrise was special. The Egyptians were probably the first to adopt a mainly solar calendar. This so-called 'heliacal rising' always preceded the flood by a few days. Based on this knowledge, they devised a 365-daycalendar that seems to have begun in 4236 B.C.E., the earliest recorded year in history.
365 days
366
200
The ancient Egyptian calendar that was created about 4000 BCE consisted of 12 months of 30 days each. The Egyptian year had 360 days. This was later changed to add 5 additional days at the end of the year, resulting in a 365 day year.
890
890
10
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They have thirty days in every month but only 3 weeks in a month, with ten days in a week :)
There are 365 days in a year. If it is a leap-year, then there are 366 days.
In an Egyptian legend, the sun god, Ra, didn't let another female god give birth to five sons so the female god added five extra days to the end of the year. These days are known as the demon days.