How to calculate the historical year, how to calculate the historical year?

For example, Sima Qian (190 BC 145 BC), his age should be 190 145 = 45, and the sum of the two is equal to the sum of the two minus 1, for example: Emperor Guangwu (6 BC - 57 BC), then his age is 6 57 1 = 62

If this question crosses the first year of the Common Era, the answer is: 2007 + 60-1 = 2066 Choose 2 50 A.D. to the present (2007) does not cross the first year of the A.D., and directly subtracts it.

From 50 A.D. to the present (2007), there are: 2007-50=1957.

The A.D. era is the Western dating method, which simply uses the birth of Jesus as the first year of the A.D., that is, the first year of A.D. The year before the first year of the Common Era was the year 1 B.C.E.

In ancient China, there were many more dating methods.

1.Era name: Chronicle. Among the Chinese emperors after Emperor Wu of the Han Dynasty, they all had era names.

And many emperors had more than one era name. In the Ming and Qing dynasties, the emperor basically only had one year name, like Zhu Yuanzhang's year name was Hongwu, the first year of being an emperor was the first year of Hongwu, and the next year was the second year of Hongwu, and so on.

2.Ganzhi year. Such as the year of Jiazi, the year of Jiawu, etc.

3. Imperial years. Emperor Wu of the Han Dynasty did not have an era name before. It can only be used in the Ganzhi year or the imperial year. Such as the eighth year of Qin Shi Huang. Han Gaozu three years. The twelfth year of King Wu of Zhou, etc.

4. The Yellow Emperor is a legendary year in the primitive society. The twenty-seventh year of the Yellow Emperor and so on.

"A.D.", that is, the era of the Gregorian calendar, said to be the xx year of A.D., that is convenient for us to remember, synchronized with the times, in ancient times did not say A.D., from the beginning of Emperor Wu of the Han Dynasty every emperor has a year name, just use the year name to count the year, Emperor Wu of the Han Dynasty before the reign of the king, such as the first emperor xx years, they all have titles, the emperor of the Qing Dynasty does not change the name of the year, one uses a lifetime, so it is easy to remember.

About the calculation of the year of the Common Era:

I. Century. 100 years for a century, add 1 to the value in front of the hundred, for example: 1069 (Wang Anshi began to change the law), 10 + 1 = 11, so, 11th century AD; Example: 221 BC (established by the Qin Dynasty), 2+1=3, so, 3rd century BC; Example:

27 BC (the Roman Empire was founded), 0+1=1, so, 1st century BC; For example: 9 A.D. (the end of the Western Han Dynasty), 0+1=1, so, 1st century A.D.

Second, the age. 1 Early (early): the first two decades of the century Example: early 20th century, around 1900-1919; Example: 594 BC (Lu State implemented the "initial tax mu"), early 6th century BC.

2 First half: 50 years before the century Example: 1800 - around 1850, first half of the 19th century.

3 Mid-40s-60s Example: 1856 (the beginning of the Second Opium War), mid-19th century.

4 Second half: post-50s e.g. 1851-1899, second half of the 18th century.

For example: 20 A.D. - 29 A.D., the 20s of the 1st century A.D.; A.D. 1980-1989 is the 80s of the 20th century. The year 20 29 is called the 20s, and the year 30 39 is called the ,...... the 30sThe 90 99 years are called the 90s.

3. The calculation involves spanning the time after BC.

Different from simply calculating BC or post-AD time, that is, one year must be subtracted from the total number of calculated times, such as calculating how many years there are between 841 BC and 1949, the correct calculation is 841 + 1949-1 = 2789 years, which can be summarized into a simple formula "add before and after and subtract one".

The reason why one year is subtracted here is that the A.D. year does not have a year 0 A.D., and the time after the B.C. cannot be calculated according to the mathematical concept of positive and negative numbers.

In the Gregorian calendar, February has 28 or 29 days, but February 30 is not a non-existent day in history, and there have been several dates with February 30, but only in certain periods and countries.

Sweden (which included Finland at the time) had planned to change the calendar from the Julian calendar to the Gregorian calendar by abolishing the leap day for the next 40 years, starting in 1700. So in Sweden 1700 is not a leap year, but the opposite of the plan, 1704 and 1708 are leap years, which makes the Swedish calendar 1 day faster than the Julian calendar and 10 days behind the Gregorian calendar. The trouble arose in 1712, when there were two leap days, making February 30 days.

This day corresponds to February 29 in the Julian calendar and March 11 in the Gregorian calendar. Sweden did not finally change the calendar to the Gregorian calendar until 1753.

In 1929, the Soviet Union decided to adopt the Soviet revolutionary calendar, with 30 days in each month, and the remaining 5 or 6 days as holidays. From 1930 to 1931, each February had 30 days, but in February 1932 it became the same number of days.

The thirteenth-century scholar Johannes de Sekonobersk

desacrobosco) claims that in the Julian calendar there was a date of February 30 between 44 and 8 BC. But then, Caesar took one day and put it in July so that the month of his birth had 31 days, and then Augustus the Great, in order to make the month of his birth also have 31 days, took one day from February and put it in August, so that it was the same as July, so that it became the number of days in each month today. However, there is no other historical evidence for this, and it is likely to be just a myth, albeit a very old one.

In addition, due to the negligence of the household administration unit, there have also been cases where the date of birth was mistakenly registered as February 30 in the identity document, which may be caused by the 30th day of the second lunar month.

In China, the lunar calendar will also have February 30 every few years, such as February 30, 1986, February 30, 1996, etc., and February 30 of the lunar calendar in 96 years is April 17 of the solar calendar.

The period 1851-1899 was the second half of the 19th century.

Calculation of the date:

1. The beginning of a certain A.D.: that is, from 1 A.D. to 19 A.D.

2. The twenties of a certain century: 20 A.D. to 29 A.D.

3. The thirties of a certain century: 30 A.D. to 39 A.D.

4. The forties of a certain century: 40 A.D. to 49 A.D.

5. The fifties of a certain century: 50 A.D. to 59 A.D.

6. The sixties of a certain century: 60 A.D. to 69 A.D.

7. The seventies of a certain century: 70 A.D. to 79 A.D.

8. The eighties of a certain century: 80 A.D. to 89 A.D.

9. The nineties of a certain century: 90 A.D. to 99 A.D.

2019-11-05Let's talk.

The century is the addition of the number on the hundred (or the number on the hundred): for example, in 1898, the number before the hundred is 18, and 18 + 1 = 19 is the 19th century; 635 years, that is, 6 + 1 = 7, the seventh century.

Century refers to the unit in which the era is calculated. A century is a hundred years and usually refers to a continuous hundred years.

When used to calculate days, the century usually begins with an era divisible by 100 or a year thereafter, such as 2000 or 2001. This odd-numbered 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 has been set at 99 years AD, while the following centuries will be 100 years, and if this definition is followed, 2000 will be the first year of the twenty-first century.

The age depends on how many tens of digits it is, and that's it. For example, in 1898, the ten digits were 9, so it was the nineties. 1355, ten is 5, that is, the fifties.

Chronology, the term for dividing a century into successive tens, is usually applied to the Common Era. Every century from the "......Ten "to" ......Nine "decades, such as 1990 to 1999 are the 90s of the 20th century (from Modern Chinese Dictionary, 6th Edition, p. 946).

The early definition is the same as that of the century, i.e., each century is a period per decade, the first decade is the first decade, and the first year is the first decade. For example, 1901 1910 is the beginning of the 20th century, 1911 1920 is the 20th of the 20th century, 1981 1990 is the 90s of the 20th century, and 1991 2000 is the end of the 20th century. In the past ten years, this definition has rarely been applied because it is inconvenient, and the way of 80s and 90s, which is easy to understand in the United States, is adopted, that is, 1980 1989 is set as the 80s, and 1990 1999 is set as the 90s.