The military uses the Julian date system for ease of calculating due dates of equipment inspections. For example, it is easier to just add 90 days to a Julian date rather than count out on 90 days on a calendar since most months have varying lengths.
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I believe one of the reasons is that the procurement systems in the military uses the Julian date in the computer programs as a simple standard that doesn't require letters and allows date calculations to be made with out additional supporting programs. In today's software environments it wouldn't be an issue but it is hard to change as large an organization as the government.
We used Julian dates in the military a little different though. I was in procurement and as an example January the 12 of 1974 was wrirtten as 4012 where the year leading with a 4 and the number of the day in that year followed. February the 16th of 1976 was written 6047 where the leading 6 was the year (1976) and the folloowing 047 was the day count in that year (31 for Jan and 16 for feb) It was a modified Julian calender and I can't figure out if it ever survived the changeover to newer software. What puzzeled me was Jan 10th 1974 would be the same as Jan 10th 1984 (4010)
The months of the Julian calendar are the months we use today. We use the Gregorian calendar, which is a slightly modified version of the Julian calendar. The month July is named after Julius Caesar. August is named after Augustus.
The Roman Empire started using the Julian calendar in the 1st century BC, and England and its colonies continued to use it until September, 1752.
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The Julian calendar was introduced by Julius Caesar in 45 BC. In the Julian calendar, the tropical year is approximated as 365 1/4 days = 365.25 days. This gives an error of 1 day in approximately 128 years. The approximation 365 1/4 is achieved by having 1 leap year every 4 years. It was in common use until the 1500s, when countries started changing to the more precise Gregorian calendar, which has more complex rules for which years are leap years. However, some countries (for example, Greece and Russia) used the Julian calender well into the 1900s, and the Orthodox church in Russia still uses it, as do some other Orthodox churches. As a result those churches celebrate several religious holidays later then non-Orthodox churches.
The people of the government tried to military draft me to fight for their country.