The Egyptians developed a calendar system that is close to the one we currently use.
The Egyptian inclination to astronomy is not purely religious but practical as well. They used the observations of the celestial bodies to predict and therefore prepare for the flooding of the Nile River. The Egyptians developed a calendar system that is close to the one we currently use. It has 30 days in one month and 365 days divided into 12 months. The difference is that they have 10 days for each week with 3 weeks each month.