Definitions for julian calendar
Random House Webster's College Dictionary
the calendar established by Julius Caesar in 46 b .c ., fixing the length of the year at 365 days and at 366 days every fourth year. There are 12 months of 30 or 31 days, except for February, which has 28 days with the exception of every fourth year, or leap year, when it has 29 days.
Ref: Compare Gregorian calendar.
Julian calendar, Old Style calendar(noun)
the solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus, establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February
The calendar which was used in the western world before the present-day Gregorian calendar. The Julian calendar differed in having all multiple-of-4 years as leap years.
Origin: Named after who introduced the calendar in 46 B.C.
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