the calendar as adjusted by , in which the year was made to consist of 365 days, each fourth year having 366 days.

the epoch of the commencement of the , or 46 b. c.

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 , 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 was proposed by , to remove or avoid ambiguities in chronological dates, and was so named because composed of Julian years.

the year of 365 days, 6 hours, adopted in the , and in use until superseded by the Gregorian year, as established in the reformed or .