The absence of a year zero is also why the 21st century actually began on January 1, 2001 instead of in 2000 as many people supposed.
It is unclear whether Dionysius included the negative “BC” years in his system or if they were added by Bede in the eight century (see next chapter).
The council however, did not issue explicit instruction regarding the method of computation.
The Alexandrian Easter tables, based upon a 19-year cycle, became the dominate method, but several others continued to be in use such that, by the end of the fourth century, the celebrations varied each year by as much as five weeks.
These computations remained in use for the Roman church and throughout Western Europe until the Gregorian calendar reform about a thousand years later.
The Roman Catholic Church switched in 1583 AD and most Protestant churches adopted the Gregorian Easter either prior to, or over the next hundred years.
Despite his abandonment of the old dating system, Dionysius established a correlation with the Diocletian years for those who continued to use the old system (the (AD).
It was later discovered that Dionysius was slightly off regarding his calculation of the year of the Incarnation.
Like most scientists who helped issue in the era of modern science, Kepler gave the glory to God for all his achievements.Obviously, as most of our astute readers would notice, we won’t find any documents dated with BC by their original author (or even with AD in the first few centuries AD).The BC-AD dating system did not exist prior to the sixth century AD, but since it is now the almost universally accepted dating system, and since dating systems can be applied to any calendar system (see the “Calendar Components” chapter in part 1), we can back-date all previous events for standardization and simplicity (see the “Closing Thoughts” chapter in part 5 for back-dating challenges).In part 2, we explored the development of various calendar systems within the political and historical context of the major nations during Biblical times and the early church period.In part 3, we look at the origin and the eventual acceptance of our modern BC-AD () dating system.