Bc and ad dating system

After all, dating an ancient event within its original calendar dating system would mean nothing without at least a common point of reference to our modern dating system.

We now examine the , including how and why it come about.

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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.

At the First Council of Nicaea (325 AD), it was agreed that the date for Easter be divorced from the Hebrew calendar and the Jewish Passover.

It was further decided to observe the holiday on the Sunday after the first full moon on or after the day of the vernal (or Northern Spring) equinox.

You may click on the “[TOC]” links to return to the Calendar Systems Table of Contents.

Throughout the previous parts of this article, we’ve dated most events using the “BC” year designation.

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.

Like most scientists who helped issue in the era of modern science, Kepler gave the glory to God for all his achievements.

Yet even with the longevity of the Dionysius Easter tables (his computations are still used in many Eastern and Oriental Orthodox churches today), they pale in comparative popularity with his related development of a new calendar dating system.

At the time, some calendars were dated by the aforementioned AUC system (based on the founding of Rome), but in the most commonly used system, calendar years were dated from the first year of the reign of Roman Emperor Diocletian (284 AD) who ushered in the bloodiest persecution of Christians (~303-311 AD) ever sanctioned by the empire.

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 ).

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