Julian Calendar: A calendar introduced by Julius Caesar in the year 45 B.C., and slightly modified by Augustus a few years later. This calendar provided that the common year should consist of 365 days and that every fourth year, now known as a bissextile or leap year, should contain 366 days, making the average length of the year 365.25 days. It differs from the modern or Gregorian calendar in having every fourth year a leap year, while in the modern calendar century years not divisible by 400 are common years. See Gregorian calendar.

 

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Julian Calendar: A calendar introduced by Julius Caesar in the year 45 B.C., and slightly modified by Augustus a few years later. This calendar provided that the common year should consist of 365 days and th . . . View Full Definition

Gregorian Calendar: The calendar now used internationally, devised by Pope Gregory in the 1580s to replace the Julian calendar, which by then had accumulated a ten-day discrepancy with the solar year. Most, but . . . View Full Definition

Julian Christmas: Ukrainians and many others from the Eastern Orthodox churches celebrate Christmas on January 7, On Christmas Eve, January 6 a lighted candle is placed in the window to guide travellers, in m . . . View Full Definition

Julian Date: Technique for the identification of successive days of the year when monthly notation is not desired. This is especially applicable in computer data processing and acquisition where indexing . . . View Full Definition