How Do You Read Dates From the Julian Calendar?
The Julian calendar uses the same month and year as the Gregorian calendar, the calendar most commonly used worldwide. Because the Julian calendar uses a seven-day week, to determine what day of the week it is, the number should be divided by seven.
The Julian calendar assumes a leap day every four years, meaning that each year on a Julian calendar is 365.25 days. The common Gregorian calendar assumes a leap day every four years with the exception of century years, which creates a disparity between the two. The Julian calendar is predominately used by astrologists and was the primary calendar used worldwide before the Gregorian calendar came to prominence in 1582.