The name of Caesar's calendar was the Julian calendar. It was replaced in 1582 by the Gregorian calendar, which we used today.
Julian
They brought the calendar with them from Europe.
No, it is the same christian ceremony. However, many Orthodox churches base their Easter date on the Julian calendar, which often differs from the Gregorian calendar that is used by many western countries.
There was an old Germanic calendar, but it was different to the Roman calendar, which is now used. The Germanic calendar no longer is used.
Nanakshahi Calendar.
Google Calendar is a calendar that can be used and viewed online.
AD is not used in the Jewish calendar. It is only used on the Gregorian (Christian) Calendar.
The Julian Calender. It was so called from Caius Julius Caesar, who conceived and put it into practice.
Some form of calendar is used almost everywhere on earth
The Mayan calendar was indeed very accurate, as it was based on advanced astronomical observations. It included multiple interlocking calendars that tracked different cycles of time. The precision of the Mayan calendar system surpassed that of many other civilizations during that period.
It was the Roman calendar.