Julian calendar 2013 calendar yearly calendar showing months for the year 2013 calendars online and print friendly for any year and month. Julian dates useful for the military because the procurement systems in the military uses the julian date in the computer programs as a simple standard that doesnt require letters and allows date calculations to be made with out additional supporting programs many times manufactures use julian dates because that is the norm in the industry. Aavso produced jd calendars give the last four digits of the julian day for each day of every month for a year the months january june are on one page while july december are on the second page for the complete jd add 2450000 to the four digit value given in the calendar for the astronomical day of your observation. The julian date code was first developed for use by the united states military in packaging meals ready to eat for soldiers using only four numbers the julian date code quickly shows how old a canned or packaged food item is at a glance all that is needed is a basic understanding of how the code works
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