Introduction to BC:
English is Before Christ, abbreviated as B.C., which means "before the Lord", that is, before the first year of AD; Or before Common Era, abbreviated as BCE, such as: 22 1 BC, 8 BC, etc. Xx BC, also known as "the first xx years". In 2697 BC, it was the first year of the ancient Huangdi calendar in China (Kaiyuan 1), the year of Jiazi, and the earliest source of the trunk and branch calendars.
Origin significance:
The year when Jesus Christ was born was the first year of AD, but he was not born in the New Year. From the 6th century to the10th century, it gradually became the universal era of Christian countries, so it was originally called the "Christian era". Later, it was shared by most countries in the world, so it was renamed "A.D.", which is often expressed in A.D. (the abbreviation of Annodomeni means "the year of the Lord").
In history books, the time before the birth of Jesus is called "BC", which is often expressed by B.C. (the abbreviation before Christ, meaning "before Christ"); The year after the birth of Jesus is "After A.D." or "A.D." for short.
1 year is equivalent to the first year of Emperor Pingdi (Liu Kan) in China. The word "century" comes from Latin, meaning 100 years or hundreds. It is also counted from the year when Jesus was born. The year from 1 to 100 is the first century and the year from 10 1 to 200 is the second century. By analogy, from 2000 to 200 1 year is 2 1 century 1 year. The year 2020 is 265,438+0 century, and the century is divided by 100, which is different from the popular century-old culture.
Due to the popularity of this chronology, after entering China, it gradually became different from the Xia calendar chronology used by the people and was called "New Calendar" and "Gregorian Calendar", and the era before the first year of this new calendar was naturally called "BC". So "BC" is another China name for "BC".