Indeed, the root of the word anniversary is the Latin for “year.”Just as important years are widely used reference points in the lives of individuals, so they are for entire cultures. Although it is 2015 today in the United States, such a number might indicate a far different year in other cultures throughout history.
The next question might be, what qualifies as a year significant enough to base an entire dating system upon it?
Under our calendar, he was probably born in the spring of 6 BC, rendering the BC and AD terms ludicrous.
Our calendar is now so thoroughly established, however, that it is easier to rename than to renumber.
So now people are starting to write about our Common Era (CE) and, before that, Before Current Era (BCE).
Before Present (BP) years is a time scale used mainly in geology and other scientific disciplines to specify when events occurred in the past.
It shows the two brothers as consuls, sitting side-by-side in special “curule” chairs (a mark of office). So a consul’s name followed by III, for example, meant it was the third time they had held the position.
Historically, people created a fresh calendar after a significant event.
Sometimes that was the coronation of a new king, and everything was counted as “in the tenth year of King Henry’s reign” and so on.
All of us tend to use the most significant dates in our lives as reference points for all the others.
For example, we think of our age in reference to the year we were born, and while we may give names to wedding anniversaries (silver, gold, etc.), we determine them by counting from the year of the marriage.
As a result, his determination of the birth year of Christ was apparently off by about 4 years, but the error was not realized until centuries after the system had come into general use, leading to the strange circumstance that Christ was actually born in approximately 4 BC.