\Jul"ian\ (?; 277) a. [L. Julianus, fr. Julius. Cf.
{July}, {Gillian}.]
Relating to, or derived from, Julius C[ae]sar.

{Julian calendar}, the calendar as adjusted by Julius
   C[ae]sar, 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   Julian calendar, and in use until superseded by the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.