The Anno Domini year–numbering system was introduced by a Christian monk named Dionysius Exiguus in the 6th century.3) The indiction cycle: a Roman tax cycle of 15 years declared by Constantine the Great.(In period sources, dates were often recorded using this cycle, hence the interest by historians.) In the *last* year of the solar cycle, January 1 is a Sunday.by Alex Carmichaeledited by Matt Slick AD does not mean “After Death.” It is an abbreviation for “Anno Domini,” which is a Latin phrase meaning “in the year of our Lord,” referring to the year of Christ’s birth. So at the time of this writing, 2011 AD is intended to signify that it has been 2,011 years since Christ was born.1 Second, if you think about it logically, as was discussed in class that day, 1 BC could not be directly followed by 1 AD if AD meant “After the Death of Christ.”2 That would mean that Christ was born then He immediately died, and we know that’s not the case.It is important to note that even though the BC/AD system of dating has Christ as its central focus, it is not found in the Bible.He also chose the starting point for a Julian period to be the year when three cycles converge: 1) The solar cycle: The 28 year cycle of the days of the month falling on the different days of the week in the Julian (not Gregorian) calendar.2) The Metonic or "golden number" cycle: The 19 year cycle of the lunar phases and days of the year.It was not actually developed until 525 AD, when the entrance of the Christ into the world was recognized as being the turning point of history, and our calendars were made to reflect that.3 In regard to the use of BCE and CE, these are more recent developments.In most usages, BCE stands for “Before the Common Era,” and CE stands for “Common Era.” BCE is used in place of BC, and CE is used in place of AD. (Anno Domini, or Year of the Lord) be replaced by B. The BBC said in an official statement that since it is "committed to impartiality, it is appropriate that we use terms that do not offend or alienate non-Christians." It described the terms B.