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 Ju·lian calendar /ˈʤuljən-/

 Jul·ian a.  Relating to, or derived from, Julius Caesar.
 Julian calendar, the calendar as adjusted by Julius Caesar, in which the year was made to consist of 365 days, each fourth year having 366 days.
 Julian epoch, the epoch of the commencement of the Julian calendar, or 46 b. c.
 Julian period, a chronological period of 7,980 years, combining the solar, lunar, and indiction cycles (28 x 19 x 15 = 7,980), being reckoned from the year 4713 B. C., when the first years of these several cycles would coincide, so that if any year of the period be divided by 28, 19, or 15, the remainder will be the year of the corresponding cycle. The Julian period was proposed by Scaliger, to remove or avoid ambiguities in chronological dates, and was so named because composed of Julian years.
 Julian year, the year of 365 days, 6 hours, adopted in the Julian calendar, and in use until superseded by the Gregorian year, as established in the reformed or Gregorian calendar.
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 Cal·en·dar n.
 1. An orderly arrangement of the division of time, adapted to the purposes of civil life, as years, months, weeks, and days; also, a register of the year with its divisions; an almanac.
 2. Eccl. A tabular statement of the dates of feasts, offices, saints' days, etc., esp. of those which are liable to change yearly according to the varying date of Easter.
 3. An orderly list or enumeration of persons, things, or events; a schedule; as, a calendar of state papers; a calendar of bills presented in a legislative assembly; a calendar of causes arranged for trial in court; a calendar of a college or an academy.
 Note: Shepherds of people had need know the calendars of tempests of state.
 Calendar clock, one that shows the days of the week and month.
 Calendar month. See under Month.
 French Republican calendar. See under Vendémiaire.
 Gregorian calendar, Julian calendar, Perpetual calendar. See under Gregorian, Julian, and Perpetual.

 Julian calendar
      n : 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 [syn: Old Style calendar]