Definition:Calendar/Julian/Year

Definition
A Julian year is the length of a year as defined using the Julian calendar.


 * $1$ Julian year $= \begin{cases} 366 \, \text {days} & : 4 \divides y \\

365 \, \text {days} & : 4 \nmid y \end{cases}$ where:
 * $y$ denotes the number of the year
 * $4 \divides y$ denotes that $y$ is divisible by $4$
 * $4 \nmid y$ denotes that $y$ is not divisible by $4$.

Also known as
Some sources refer to a Julian year as a civil year.

However, the Julian year has not been used as the basis of the calendar for most societies for a number of centuries now, having been supplanted by the Gregorian year.

Also see

 * Discrepancy between Julian Year and Tropical Year