Common era dating system
This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years from the start of this epoch, and BC denoting years before the start of the era.
In general, any given year "x BCE" becomes "-(x-1)" in the astronomical year numbering system.
This dating system was devised in 525 by Dionysius Exiguus of Scythia Minor, but was not widely used until after 800.
The Gregorian calendar is the most widely used calendar in the world today.
Egyptians also used a variation on this system, counting years based on years of a king’s rule (so, an event might be dated to the 5th year of someone’s rule) and then keeping a list of those kings.
But how did we get from that event-based organization to sticking with just one primary moment? is very easy for people to cope with because the life of Jesus is obviously incredibly important in Christian Europe.
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D.” calendar designation first came into being, says Lynn Hunt, author of Measuring Time, Making History and professor of history at UCLA. For example, the Romans generally described years based on who was consul, or by counting from the founding of the city of Rome.