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History is a science with time and space as its dimensions. When talking about any historical event, thing, person, etc. We should define its time period and spatial scope. The spatial scope of history is not discussed here. The historical period is measured in years. Year is also a unit of social life. Time is the speed of movement, and space is the range of movement. 2008 is the time when the earth revolves around the sun. Time units less than years are quarter, month, ten days, week, day, hour and minute. The earth tilts around the sun in an elliptical orbit.

Take turns to bring about seasonal changes. At first, the moon is the time for the moon to go around the earth once, once full moon and once empty. Calendar month developed from this, but it is different. The sun is the time when the earth rotates once. Week, also called week, was originally related to the change of moon phase, which happened to be the total lunar eclipse of1/4. The above years, seasons, months, weeks and days are all based on the movement of celestial bodies. The invention of ten days, minutes and seconds is to subdivide time periods and facilitate work and life. Hours, minutes and seconds are embedded in a day in 24-base and 60-base, and minutes and seconds are not bad. week

Between years and months, let it go round and round without division. If there are more than 52 weeks in a year. The problem of matching and coordination in this respect has been satisfactorily solved.

In the field of history and social life, the units of measurement greater than years are years, centuries, millennia and millions of years, among which the first three are commonly used. However, with their cooperation and coordination, the problem has not been completely solved. The reason is that they are not based on celestial movements or other movements, but are artificially defined and established. So it can be so agreed, and it can be so agreed. Solving these problems requires the participation and recognition of the whole society.

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Now the common Gregorian calendar has a history of 1000 years. Eusebius (260-340), a Greek and Christian historian in the 4th century, adopted a unified comprehensive chronological method. In the 6th century, the Spanish theologian isidore (560-636) put forward the Christian chronology, that is, the current Gregorian calendar, which started at 1 (A, d, i). This chronology and its starting point are also subjective and habitual, not based on sports or major events in nature. In the 8th century A.D., Bede (673-735), a British church historian, first calculated the number of years in BC according to the year of A.D., and set it as BC 1 year, 2 years in BC (… ⅲ, ⅱ, 1b, c) and so on. Bede's calculation didn't set a zero around A.D. [Roman numerals used in Europe didn't have the form of zero (0) at that time], which paved the way for later differences and disputes. After Bede, with the expansion of Christian forces, there are more and more Christian chronologies.

Widely used, China also changed its calendar after the Revolution of 1911.

In the16th century, the word "century" was used to represent100th year, in order to divide the time series into years older than the Millennium. The earliest application was the church history compiled by church historians in magdeburg century. Christianity has its own teachings and the saying that a thousand countries celebrate. After the introduction of modern historians in China, they often imitate the century and translate it into "Millennium". Among them, the most representative and influential are the Great Works of the Soviet Academy of Sciences 10 and 20 volumes published by Sanlian Bookstore. Some scholars call thousands of years "the thousandth year". I think that will be two words more than the former, and it is not as good as "Millennium" because the development law of language vocabulary is to strive for simplicity on the basis of accuracy and richness.

In the 20th century, the word "ten years" appeared again, referring to the period of ten years. But "1980s" is spoken English in 1980s, and "1970s" is generally abbreviated as 1970s or 1970s, and so on. Russian has another way of writing ... at this point, ten years has become ten years.

Ten years is a century, ten centuries is a three-year carry sequence of one thousand years, and three major units of time measurement greater than years.

Mathematically, there are two algorithms for chronology: from 0 to 99 and from 1 to 100. The century BC can be the first century BC 1 to BC 100, and the second century BC 1 01to 200 BC. It can also be BC 1 before 99 BC 1 century, BC 100 to BC1before 99 century. ...

The events in BC are far away, relatively unimportant, and there are few differences and disputes, so I won't talk about the advantages and disadvantages of these two divisions here. I think the century BC can be unified into the first century BC 1 to BC 100, the first 200 years BC 1 0/0, and so on. If we insist on a more accurate statement, we can also refer to 200 BC and 100 BC as the years at the turn of the 3rd and 2nd centuries BC, and the years at the turn of the 2nd century BC and 1 century BC. It should be pointed out that the period of the first half and the second half of a certain century BC is just the opposite of the second half of A.D. For example, the first half of BC 12 century refers to BC 1200 to BC 1 49, and the second half of BC 1 century refers to BC 50 to BC/klc.

In the ancient history of the world, the incorruptibility in the early, first, middle, second and later periods of several thousand years BC is relatively common. One thousand BC refers to BC 1 to BC 1000, and two thousand BC refers to BC 100 1 to 2000, and so on. Of course, the years before 3000 and 2000 can also be regarded as the years when two millenniums intersect. I think the 20th century BC and19th century BC can be regarded as the early 2000s BC. The five centuries of 20- 16 BC should be regarded as the first half of 2000 BC. The five centuries BC 17- 13 can be regarded as the middle of the second millennium BC. The fifth century (BC 15- 1 1) should be regarded as the second half of the first two thousand years. The two centuries BC 12 and BC 1 1 can be regarded as the late 2000 BC.

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After the AD, things were closer to reality, and the chronology was gradually refined. Although Millennium is sometimes used in world history, it is generally used less. Commonly used are century and year. There are two calculation methods from 1 to 100 and from 0 to 99 in the century, each with its own advantages and disadvantages. This is mainly a matter of convention, and habit becomes nature. Plus there is no zero year, things are a bit complicated. I think the century after A.D. will be the century from 0 to 99. This can avoid the trouble that 1800, 1900, 2000 and other years cannot be included in an era. Because a year should belong to a certain age and an age should belong to a certain century. A year should not span generations or centuries. If the century after A.D. is set from 1 to 100, then 200 1 is the beginning of 2 1 century, and 1990- 1999 has been unified to the 1990s, then 2000 has no age to belong to. Setting the century from 0 to 99 also satisfies many people's desire to enter the next century and the next Millennium as soon as possible. Because 2 1 century is the first century of the third millennium. Of course, in this way, 1 century can only be from 1 to 99. As a special case, 1 century is only 99 years, leaving a little regret. By analogy, 1800 to 1899 is19th century, 1900 to 1999 is 20th century, and from 2000 to 2009 is 2 1 century. 2 1 century and the 22nd century constitute the beginning of the year 3000.

It is particularly important to note that when calculating the time period before and after crossing AD, the year zero that does not exist in a year should be subtracted, which cannot be ignored. For example, in 1989, China solemnly commemorated the 2540th anniversary of Confucius' birth. Confucius was born in 55 BC1,1989+55 1 = 2540. But because there is no zero year; You have to subtract one year. Therefore, the 2540th anniversary of Confucius' birth should be commemorated by 1990.

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Since the beginning of this century, the pace of life has been further accelerated, so the "times" have appeared. It refers to110 in a century, indicating the number of years of10. Mathematically speaking, there are also two methods to calculate the year from 0 to 9 and from 1 to 10. According to the article "Century" in Cihai 1970, it is also argued that 197 1- 1980 is from the 1970s. The version 1989 also claims that 198 1- 1990 is from the 1980s. I think the age should be unified from 0.

To 9. For example,/kloc-0 refers to 1920 to 1929, 1990 refers to 1990 to 1999. The reason for this division is that it is convenient for ten places to have this "auspicious" every year during the decade of "auspicious". For example, 1970- 1979 was in the 1970s, and seven of them ranked tenth every year. In addition, foreign languages are easy to abbreviate, such as 1980 for the 1980s. If the age is from 1 to 10, UK, Russia

Language and so on cannot be abbreviated. Because that division will be advanced to 1990 in the last year. However, there is no unified name or title for the 20 years before the 1920s (which also proves that the "Decade" was put into use in the 1920s and 1930s). There is no need to make up for it at first, but it is urgent to name it in the first two decades of this century. In my opinion, the period from 20 10 to 20 19 should be called "1920s" in the 20th century. This is consistent and coordinated with the appellation in the 1920s and 1930s. There is a "-"in every year of ten years (10-19). Need to consider the name of the year from 2000 to 2009. Both Chinese and foreign languages can be said to be "the first century of a certain century". But it is not simple to say this, and it is difficult to be generally accepted and popularized by the whole society. Of course, the shorthand form of foreign language situations can still be 2000s or 2000s, and shorthand without inputting a foreign language is inconsistent with oral English, as mentioned above. For example, English speakers are now in zippers.

Naudts, Chilches, Oh, Oh. The written form and oral expression of Chinese should be consistent. I think the first decade of 2 1 century can be called1900s, the first decade, the early decade, the meta-decade and so on. Among the above options, I think1900s is the most scientific and promising. One is that there are zeros (00-09) in the ten digits every year, and the other is that it matches the ten digits and the twenty digits. Three reasons

The (natural number) before 1 is 0 (on the number axis). Of course, it was originally called1900s, which was a bit awkward and unaccustomed. However, as a morpheme, zero has been widely used and gradually accepted by people. For example, zero is equal to 24 o'clock midnight. Now people prefer to say zero (positive) and zero 15, rather than 24 points (positive) and 24 points 15. People can only say zero on the thermometer, and on this basis, say a few degrees above zero and a few degrees below zero. In this case, the first and second decades at the beginning of this century can also be abbreviated as.

For the 1900 s and 19 10 s, naturally, if the masses are more willing to accept honesty in the first decade, the first decade and the yuan decade, that's not bad. I don't think there is a problem with shorthand. The written forms of twenties and thirties can and often are abbreviated as twenties and thirties in Arabic numerals. By analogy, we can also abbreviate 10 and 10 to 10 and 00; However, the year of using Chinese characters is still written on it, not the year of 2000 and 2000.