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Dionysius never said how he determined the date of Jesus' birth, but some authors theorize that he used current beliefs about cosmology, planetary conjunctions and the precession of equinoxes to calculate the date. Up until this point, Dionysius’ system had been widely used.
); the latter means “in the year of the lord,” often translated as “in the year of our lord.” (It was thought when the AD dating system was created that its year 1 was the year Jesus of Nazareth was born.) was the first of these to appear.
Prior to the 6th century AD, many Christians who didn’t use an Anno Mundi (in the year of the world) type system relied on Roman dating, either marking dates from the year legend had it that Romulus and Remus founded Rome (753 BC) or by relying on the date system established under the Roman emperor Diocletian (244-311), based on the accession of Diocletian.
By the 15th century, all of Western Europe had adopted the B.
system gained in popularity in the ninth century after Holy Roman Emperor Charlemagne adopted the system for dating acts of government throughout Europe. The alternative form of “Before the Common Era” and “Common Era” dates back to 1715, where it is used in an astronomy book interchangeably with “Vulgar Era.” At the time, vulgar meant “ordinary,” rather than “crude.” The term “Vulgar Era” is even older, first appearing in a 1615 book by Johannes Kepler.