Why is 221 BC important in Chinese history?

In the twenty-sixth year of Qin Shi Huang in 221 BC, Qin attacked Wang Ben, entered Linzi, captured Wang Tianjian of Qi, and died in Qi. At this point, Qin unified the six countries. The Warring States period ended.

King Yingzheng of Qin established the Qin Dynasty, the first unified dynasty in the history of Chinese feudal society. Calling himself the "First Emperor", he took the October of Jianhai as the beginning of the year, and changed his name to the people called Qianshou. The whole country is divided into 36 counties, and the counties are guarded, captained, and supervised, and the system of dividing and sealing princes is abolished.

Unified weights and measures, fixed currency system, cars on the same track, books on the same text. 120,000 wealthy households from six countries went to Xianyang.

Memorabilia of the Qin Dynasty.

Brief notes: 1) 230 BC In 221 BC, Qin came to Han, Wei, Chu, and Yan. Zhao.

Qi, dominate the world. (2) In 221 BC, King Yingzheng of Qin proclaimed himself the First Emperor. The world is divided into 36 counties, and Xiagao County, all of which are appointed and dismissed by the highest level, which has become the beginning of China's 2,000-year-old feudal centralized political power model.

3) Beginning in 221 BC, unified weights and measures, currency, and writing.

4) In 214 BC, the Ling Canal was dug. And during the Warring States period, the vassal states built the Great Wall on the original basis, starting from Lintao in the west, to Liaodong in the east, and was known as the Great Wall of Ten Thousand Miles.

5) In 213 BC, at the suggestion of Li Si, the first emperor of Qin, he burned the history books of the countries outside Qin, and killed more than 400 scholars and Confucian masters, that is, "burning books and pit Confucianism".

6) In 210 BC, Qin Shi Huang died, and his son Hu Hai ascended the throne, that is, Qin II.

7) In 209 BC, the soldier Chen Sheng and Wu Guang rebelled against Qin, known as the "Daze Township Uprising" in history.

1.Qin unified the Six Kingdoms.

2.Officially entered the feudal society.

Late third century.

The first century B.C. was the period from 99 B.C. to 1 A.D. That is to say, the BC time is negative, and the smaller the number, the closer it is to the AD. So 221 BC is the late 3rd century BC.

The so-called 2014 A.D. is the 2014th year from the first year of A.D., and 2017 B.C. means the 2017th year before the first year of A.D. There is no 0 BC and there is no 0 AD.

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. But the months of the B.C. years are still counting, 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.

Century Basic Meaning:

In Latin, this odd chronology comes from the post-Jesus era, where 1 year usually means "year of our lord", so the first century runs from 1 AD to 100 AD, and the 20th century runs from 1901 AD to 2000 AD, so 2001 is the first year of the 21st century.

However, the first century was previously defined as 99 years, when the century was 100 years, and the year 2000 was the first year of the twenty-first century.

The above content reference: Encyclopedia - BC.

Qin unified the six countries, and King Yingzheng of Qin was called the first emperor. Qin Shi Huang was the first monarch in Chinese history to use the title of "emperor", completing the unification of China and laying the basic pattern of China's political system for more than 2,000 years. <

In 221 BC, Qin unified the six kingdoms, and King Yingzheng of Qin was called the first emperor. Qin Shi Huang was the first monarch in Chinese history to use the title of "emperor", completing the unification of China and laying the basic pattern of China's political system for more than 2,000 years.

221 B.C. and 221 A.D., of course, are not the same. The difference between the two is 442 years, and it is more intuitive to represent it as a number axis, and the BC is arranged from "0" to the left as a negative number.

The AD (later) is arranged according to the natural number from "0" to the right, which is very intuitive. The difference between 221 B.C. and 221 A.D. is 442 years, i.e., 221 (221)-1 221+221 441.

In using the A.D. year, it should be noted that the calculation involves a time spanning B.C., which is different from simply counting B.C. or post-A.D., i.e., one year must be subtracted from the total number of times calculated.

If we calculate how many years there are between 841 and 1949 BC, the correct calculation is 841 + 1949-1 2789 years, and this algorithm can be summarized into a simple formula "add before and after and subtract one".

In 221 BC, Qin Shi Huang unified the six kingdoms. In 221 AD, Liu Bei was proclaimed emperor.

In 221 BC, Qin Shi Huang unified China, and in 221 Liu Bei attacked Eastern Wu, and the Eastern Han Dynasty perished.

The difference is 442 years, 2237 years ago in 221 BC and 1795 years ago in 221 AD.