Thus, the decision was made to abandon the pagan dating system and to replace it with a Christian-based structure. In his attempt to calculate the year of the Messiah’s birth, he used Bible facts such as Jesus being baptized in Tiberius’ 15th year (Lk 3:1) and that he was about 30 years old at the time (Lk ).
Many unsuccessful attempts were made over the next hundred plus years to harmonize the Easter date among the various churches.
Finally in 525 AD under the direction of Pope John I, , a Scythian monk and scholar living in Rome, published new Easter tables based upon the Alexandrian computations, but converted from the Alexandrian to the Julian calendar.
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.Diocletian's attempt to exterminate the believers failed, and Christianity even became the favored religion less than 15 years later under Emperor Constantine.Still, it must have been troubling to many believers to utilize dates based upon Diocletian’s reign.“BC” and “AD” are designations given to identify the years within the calendar dating system that is based upon the birth of Christ as its point of origin.Every so often, we hear someone pose the question, “If BC denotes ‘Before Christ’ and AD signifies ‘After Death’, how do we number the years between his birth and death?At this time, many European protestant churches were using astronomical Easter computations based on tables developed by Johannnes Kepler, arguably the most important astronomer of the scientific revolution and the father of “celestial mechanics” which helped explain the planetary motions.