The Egyptian civil calendar, base of the Roman Julian and today’s Gregorian calendar, was the first solar calendar known to use a year of 365 days, approximately equal to the tropical year. The Egyptians added 5 days to the schematic (astronomical) year of 30 x 12 = 360 days, the astronomical calendar used by the Sumerians from 2400 BC on.
The 360 days Sumerians (Chaldean) normal year equals with the 360 degrees of the epileptic divided by 12 sectors we still use today. It could be connected to the Sumerian
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