At present, the common method of calculating age in the world is the method of AD chronology. Popular in the 6th century, the legendary Christ Jesus was born in the first year of AD, which happened to be the first year of the Yuan Dynasty in the Western Han Dynasty. The first year of A.D. is a symbol of the beginning of a year. What happened before this, from the first year forward, is called XX BC; What happened after that, counting backwards from the first year, is called XX years. Every 10 year is called a "decade" and every 100 year is called a "century".

[Problem solving process]

When using the time scale, we must first find the symbol of the beginning of the calendar year-the first year of A.D., so that the greater the number of BC years forward (left), the farther it goes; From this, backward (to the right), the greater the number of years, the closer it is to the present or the future. The difference between the years before and after A.D. is to subtract the small number from the big number. The difference between X BC and XX AD is to add up the figures of these two years and subtract "1". When calculating the historical age and century, we should pay attention to: 1. If it is more than 100 digits, then the hundred digits plus 1 is the century, and the ten digits represent the year. 2. The year XX, if not a hundred digits, is the first century. The method of expressing century and age in XX BC is the same as that in XX AD, but don't forget to add "BC".

reference data

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┃ Dynasty | Place of origin ┃ Capital ┃ Today.

┃ Xia ┃ arrived in Anyi ┃ Xia County, Shaanxi Province at the end of the 22nd century.

┃ 265438+early 20th century-about before that.

┃ 65438+Early 7th century ┃ Yang Zhai ┃ Henan Yuxian.

┃ About17th century ┃ Bo ┃ Shangqiu, Henan

Shang │ 1 1 century ago

Yin Anyang, Henan

┃ Western Zhou Dynasty ┃ About 1 1 Century -77 1 ┃ Hao Jing ┃ Xi, Shaanxi Province.

Zhou; week

┃ Eastern Zhou Dynasty ┃ 770- 256 ┃ Luoyi ┃ Luoyang

| Qin Qian 22 1- Qian 206│ Xianyang │ Shaanxi Xianyang

┃ Western Han Dynasty ┃ 206 BC-25 AD ┃ Chang 'an ┃ xi 'an, Shaanxi

a surname

┃ Eastern Han Dynasty ┃ 25-220 ┃ Luoyang ┃ Luoyang, Henan

Three Wei 220-265 Luoyang Henan Luoyang

┃ Han Shu ┃ 221-263 ┃ Chengdu ┃ Chengdu, Sichuan

This country

| Wu 222-280 Jianye in Nanjing, Jiangsu

┃ Western Jin Dynasty ┃ 265-3 17 ┃ Luoyang ┃ Luoyang, Henan

gold

┃ Eastern Jin ┃ 3 17-420 ┃ Health ┃ Nanjing, Jiangsu

┃ Sixteen countries │304-439

┃ Song │ 420-479 Health │ Nanjing, Jiangsu

┃ Qi │479-502│ Jiankang │ Nanjing, Jiangsu

Liang | 502-557 Jiankang Nanjing Jiangsu

Chao, Chen, 557-589, Jiankang, Nanjing, Jiangsu

┃ North ┃ North ┃ Pingcheng ┃ Datong, Shanxi

Wei Luoyang Luoyang Henan Luoyang

East Wei 534-550 leaves Linzhang, Hebei Province

Western Wei 535-556 Chang 'an Shaanxi xi 'an

┃ Beiqi ┃ 550-577 ┃ Ye ┃ Linzhang, Hebei

┃ Northern Zhou ┃ 557-58 1 ┃ Chang 'an ┃ xi 'an, Shaanxi

Sui 58 1-6 18 Daxing District, Shaanxi Province

Tang 6 18-907 Chang 'an Shaanxi xi 'an

│ Five beams │ 907-923 | Bian │ Kaifeng, Henan

┃ Later Tang ┃ 923-936 ┃ Luoyang ┃ Luoyang, Henan

Later Jin Dynasty, 936-947, Bianzhi, Kaifeng, Henan

┃ Later Han Dynasty │947-950│ Bian │ Kaifeng, Henan Province

Dai | Hou | Zhou | 95 1-960 | Bian | Kaifeng, Henan

┃ Ten countries │902-979

┃ Northern Song Dynasty | 960- 1 127 ┃ Kaifeng ┃ Kaifeng

Song (surname)

┃ Southern Song Dynasty ┃1127-1279 ┃ Lin 'an ┃ Zhejiang Lin 'an.

┃ Imperial Capital Liaoning┃

Liao 907- 1 125

┃ Dali 937- 1254 ┃ Taihe City ┃ Dali

┃ Xixia | 1032- 1227 ┃ Xingqingfu ┃ Yinchuan, Ningxia

┃ Huining │ Acheng

Jin │1115-1234 │ Beijing

Henan Kaifeng Kaifeng

Yuan │ 1206- 1368│ Dadu │ Beijing

Ming │ 1368- 1644│ Beijing │ Beijing

| Qing1616-191│ Beijing │ Beijing.

China ┃┃1912-1949 ┃ Nanjing ┃ Nanjing

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