Dionysius Exiguus, a Scythian monk, proposed the system of Anno Domini (meaning "the year of the Lord") in 525. This idea spread gradually throughout the western Christian world. It adoption was largely due to Bede (672-735), a Christian monk and historian from Northumbria, in England, who used this system to date the events in his history.
The name of Caesar's calendar was the Julian calendar. It was replaced in 1582 by the Gregorian calendar, which we used today.
Easter is not schedualed by the Julian calendar; it is schedualed by the Jewish calendar in conjunction with Passover, the time during which Christ was arrested, tried, and crucified.
The Julian calendar has the same month names, the same year numbering, and the same number of days per month as the Gregorian calendar. Aside from making New Year's Day the same around the world (1 January), the only difference between the calendars is that in any 400-year period the Gregorian calendar has three fewer days than the Julian calendar. In the 400-year period that began on 1 January 2001, the three days that are part of the Julian calendar but not part of the Gregorian calendar are 29 February 2100, 29 February 2200 and 29 February 2300. The Julian calendar accumulates one day of error every 128 years. The Gregorian calendar accumulates one day of error every 3200 years.
The Julian Calendar was initiated by Julius Ceaser in 45B.C.
The Julian Calendar is named for Julius Caeser.
Although the Julian calendar, which is extremely similar to the Gregorian calendar, the most popular calendar now, had been in use since it was introduced by Julius Caesar in 46 BC, the system that we use now for numbering the years of the Julian and Gregorian calendars was not introduced until AD 525, and it did not become widely popular until the 9th century.
the Roman calendar
2012 in the Julian calendar is a leap year that begins on a Saturday and ends on a Sunday. 1 Jan 2012 in the Julian calendar is 14 Jan 2012 in the Gregorian calendar.
the Gregorian calendar
The Julian calendar begins on January 1st. next January 1st will be 1001.
Not a country, but Foula still uses the Julian calendar
The civil version of the Julian calendar is based on the su, and so it is solar. However, the Julian calendar includes an undated lunar calendar that allows it to calculate when Easter is, so it is lunisolar.