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Dating Systems

There are three major dating systems used in reference to historical events: Terran, Vilani, and Imperial. The Terran calendar centres on a year about midway through the period of Vilani ascendance. The years ascend and descend from one, without year zero, and are suffixed AD and BC, respectively. Terran years have 365 days and are considered standard for the length of a year. Years are further subdivided into months and weeks, although these divisions are no longer used outside the Solomani sphere. Vilani dates count from the founding year of the First (or Vilani) Imperium. Those before are suffixed PI (Pre-Imperium), those after are suffixed VI (Vilani Imperium), with no year zero. Vilani years are approximately 1.33 standard years in length. Vilani years are further subdivided into seasons, months, and weeks. Imperial dates count from the founding year of the Third Imperium, specifying year zero as a holiday year. Dates before that are negative, and dates after that are positive. Imperial dating uses a Julian system for specifying days. Each day in the year is consecutively numbered beginning with 001. Thus the first day in the year 1105 is notes as 001-1105. Weeks of seven days and months of 28 days are used to refer to lengths of time, but rarely to establish dates.