What does BC mean? What period is it?

"B.C." is before the "first year of the Common Era". We are now 2020 and are "A.D.". Of course, under normal circumstances, we don't say the word "A.D.", and officially we just say "A.D. 2020".

As for what period it is, you can understand it as Jesus.

Before he was born, it was "B.C.", and the year of Jesus' birth was "A.D.", which was based on the year of Jesus' birth.

If the date of China is calculated, the first year of the Common Era is the first year of the first year of the Hanping Emperor.

Therefore, we can also say that "BC" is the year before Emperor Hanping ascended the throne, and the year when Emperor Hanping ascended the throne is "the first year of AD".

In fact, to understand this way of dating, it is very simple, first draw a straight line at random, on paper, on the ground, or on the wall. Straight line direction from left to right.

Then draw a dot in the middle (anywhere in the middle).

We call the dot in the middle the "first year of the Common Era", which is the year of Jesus' birth.

The left part of this dot is "BC", the right part is "A.D.", and the point on the right is this year, this month, and this day and this moment.

To put it bluntly, "AD" is a reference point, and we use it as a benchmark to calculate the years and months, otherwise what should we call the years and months? After all, this year 2020 is 2020 nodes from the first year of the Common Year, so this year is 2020, and if the nodes change, then this year's statement will inevitably change.

However, it should be noted that the year of "BC" is "backwards", that is, "2 BC" first, and then the following year is "1 BC", and the higher the number, the farther away from modern times.

As to why the date of Jesus' birth is used as the "first year", it can only be said that we have chosen a common method of calculation. It doesn't matter if the setting of this year is the birth day of Jesus or Qin Shi Huang.

The date of birth is essentially no different, just a base point.

AD is the abbreviation of "Gregorian era", which can be understood as 0 years, and the years of BC are counted backwards. The period is probably our Western Han Dynasty.

As far as I know, B.C. refers to before the first year of the Common Era, that is, before the birth of Jesus. However, in China, BC also refers to before the "first year of the Ping Yuan Emperor of the Western Han Dynasty".

BC, abbreviated is, meaning the time before the year of the birth of Jesus. A.D. is the abbreviation of "Gregorian Era", which is an internationally accepted chronological system, with the legendary year of Jesus' birth as the first year of the Gregorian calendar, which is equivalent to the first year of the Western Han Dynasty in China.

The first year of the Common Era is the legendary year of the birth of Jesus, and the first year of the Common Era is the historical period before the birth of Jesus.

B.C. means before the first year of the Common Era; For example, in 198 B.C., 9 B.C., etc., AD is a kind of chronology.

In history books, when recording the year and date of a historical event by a calendarer, the concept of BC often appears, but what does BC mean? How is this Common Era calculated? Let's find out.

01 A.D. is a chronological method, the so-called 2014 A.D. is the 2014th year from the first year of A.D., and 2017 B.C. means the 2,007th year before the first year of A.D.

02 It should be noted that there is no such thing as 0 BC and no 0 AD. The year after 1 B.C.E. is the first year of the Common Era (i.e., 1 A.D.). The years of the Common B.C. are counted backwards.

For example, the Western Han Dynasty was founded in 202 BC, and the Qin Dynasty was founded in 221 BC, which was later in 202 BC than in 221 BC.

03 Note that the months of the B.C. are still counted correctly, with January before and December last. The same is true for the dates, with the first day of the new year before and the fifteenth day after.

04 The year 1 A.D. is equivalent to the first year of Emperor Ping (Liu Yin) of the Western Han Dynasty in China. The word "century", ** in Latin, meaning 100 years or hundreds, is also counted from the year of the birth of Jesus, with the first century from 1 to 100 A.D. and the second century from 101 to 200.

05 The year 2000 is the first year of the 21st century, and it is not the same as the popular century-old culture. Because of the popularization of this chronological method, after entering China, it gradually differed from the summer calendar chronology used by the people, and was called the "new calendar" and "Gregorian calendar", and the era before the first year of the new calendar was naturally called "BC".