BC is the abbreviation before Christ.

In BC, English is Before Christ, abbreviated as B.C., which means "before Christ/before the Lord", that is, before the first year of AD. Such as: BC 197, BC 8, etc. Xx BC, also known as "the first xx years".

Century refers to the unit for calculating age. A century is a hundred years, which usually means a hundred years in a row.

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The year when Jesus Christ was born, as the first year of A.D., gradually became a universal era in Christian countries from the 6th century to the10th century, so the original Christ was also 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.

The first year of the Western Han Dynasty was equivalent to the first year of the reign of China Pingdi (Liu Kan).

The word "century" comes from Latin, meaning that 100 is also counted from the year when Jesus was born: 1 to 100 is the first century, and10/to 200 is the second century. By analogy, 20 17 is 2 1 century, and 200 1 year is 2 1 century.