The months and days of the Julian calendar were used, the year starting in March. However, in 1256 AH the difference between the Hijri and the Gregorian calendars amounted to 584 years. With the change from lunar calendar to solar calendar, the difference between the Rumi calendar and the Julian or Gregorian calendar remained a constant 584 The leap year used was years that were multiples of 4 but over time did not keep up with the earths rotation around the sun. Eventually the Gregorian calendar was adopted from the Julian calendar in 1582 and corrected the leap year problem. The Gregorian Reform The average length of a year in the Julian Calendar is 365.25 days (one additional day being added every four years). This is significantly different from the ‘real’ length of the solar year. However, there is uncertainty among astronomers as to what the length of the solar year really is. However, it is not possible to represent a quarter of a day in a calendar, so a Common Year in the Gregorian calendar has 365 days. As a result, it does not perfectly align with the solar year. This .25 difference is what gradually makes our calendar become out of sync, and over four years that extra day is added to realign the calendar and The modern Gregorian calendar was introduced on the orders of Pope Gregory XIII in late 1582; it replaced the Julian calendar, which had been constructed on the orders of Julius Caesar around 50 B.C. For another thing, the calendar system is inconsistent between dates before and after the year 1. calendar. Calendar - Ancient Egypt, Solar Year, Lunar Month: The ancient Egyptians originally employed a calendar based upon the Moon, and, like many peoples throughout the world, they regulated their lunar calendar by means of the guidance of a sidereal calendar. They used the seasonal appearance of the star Sirius (Sothis); this corresponded .

year in julian calendar