One of the two lasting contributions of the Egyptians to astronomy is the 24-hour division of the day. The Egyptians divided a day into 12 equal parts and then divide it into 24 hours a day because they found out that another 12 hours for the night. Egyptian astronomers were mathematically forced into a 12-part equal division of the night and ultimately the 24-hour day.
After Egyptians discovered a day they discovered 360 days a year and then added 5 days of the feast days which made of 365 days. Approximately a year was 365 1/4 days even this fixed calendar fell behind the sun about 1 day every 4 years.
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