China s geography is very large, why is it still using a time zone?

In ancient times, during a period when people were less communicative, people living everywhere determined their time by the trial movement of the sun. For example, people often say "sunrise and sunset". However, the time system is different in different regions.

In fact, in our region, the "local time" is different depending on the campaign. "Local time" refers to the time when the sun rises to its highest in a place divided by 12 noon, and between two places between 12 noon and divided by 24 hours. The law of the local city is that where the longitude is the same, the place is the same.

In order to facilitate the timekeeping of a region or country, the earth is divided into 24 time zones according to longitude, and every 15 minutes is divided into a time zone based on the prime meridian. China spans multiple time zones, but only one time zone is also the result of long-term practice Due to the topography and economic development level, the distribution of Chinese population is relatively concentrated, and the vast majority is east of the "Heihe Tengchong Line". The coastal and Yangtze River areas had to be opened up,** getting busier and busier, with more and more foreign steamers coming and going, and expatriates and businessmen coming in and out, requiring uniform standard time services.

The rotational motion of the earth causes the sun to rise in the east and set in the west, with sunrise being daytime and sunset being night. Around the world, date changes and temporal trends are determined on the basis of the phenomenon of day and night. However, due to the different locations in different places, the time standards are also different, which causes confusion in time.

To overcome this, the International Longitude Conference was held in Washington, D.C., in which the participating countries created a general standard time system with 180 degrees of longitude as the theoretical Japanese system, with a longitude of 15 and a difference of 1 hour in each place. However, not all countries comply with such regulations.

Once a country has determined its time zone, it will create as much time as possible to suit it, as agreed. However, the chaos and troubles caused by too many time periods are still inevitable, and for this, a multi-regional system has to be adopted. Medvedev, the incumbent Russia, proposed to change the previous 11 time zones to 9 time zones.

Nevertheless, Moscow time is the legal time in Russia, but life in various places is carried out according to the local time zone. For a long time, the regional system has had a great impact on the lives of Russians, who check the local time everywhere they go, so not to get angry. It is also an interesting phenomenon that the Russians greet the New Year twice in a year 3354, according to the local time zone time, and the other according to the standard Moscow time.

Because our country is a whole, it is more convenient to use the same time zone for unified management, so my Congress will use one time zone.

Because if you don't use the same time zone, then it will be very messy, only a unified time zone, many things are much more convenient, and unnecessary trouble can be avoided.

Because the division of time zones is based on each ocean, even if the land area of our country is large, it is also a time zone.

Because it's related to the sun, it's normal to use a time zone.

China straddles 5 time zones, while the United States straddles 7 time zones.

A time zone is an hour apart.

In Beijing time, it is 10 hours away from Los Angeles and 12 hours away from Washington.

5 Beijing time used in China, which is the standard time of the East 8th District.

Presumably all readers have this question, among the world's largest countries across time zones, such as Russia, the United States, Canada and China, the first three have implemented a time zone system, only China does not distinguish time zones, the country has a time zone, that is, the East Eight Zone.

Let's take a look at how these countries that have implemented time zones distinguish time zones. Why doesn't China distinguish time zones?

The time zone is based on the inconsistency of the global time caused by the rotation of the earth by the sun, and the time of life and rest is also inconsistent, so the time zone is set for a reference comparison time! Take Greenwich Observatory, UK.

The longitude is in the zero time zone, and to the east is from the 1st East Zone to the 12th East Zone (the International Date Line, and to the west is from the 1st West Zone to the 12th East and West Zone also ends with the International Date Line!). The world is divided into twenty-four time zones, and countries can refer to determine the time zone of their domestic zone according to their needs, but it is not mandatory! Just crossing the international date line needs to be adjusted!

To put it simply, from China to the United States, the date is minus one day, from the United States to China, the date is added by one day, why set a date change line? Because the earth is always turning, there is always a longitude that needs to be adjusted to the date, and most of the 180-degree meridians pass through the ocean, so it is unlikely to affect daily work, and therefore this line is not a straight line, but will avoid crossing the continent and turning according to the actual situation!

The time zones of the states of the United States are basically distinguished by longitude, and perhaps the United States is one of the most standard ones to perform! Maybe that's the dividing line with the states of the United States.

Most of them are mainly straight and diagonal lines are related!

The time zones in Russia are more inconsistent, for example, Yekaterinburg, which is almost the same.

And Omsk is implemented in two time zones, and the crooked division should be related to a long history!

China's time zone spanning, the whole of China spans five time zones from east to west, but the national unified time of the East Eight Zones we implement is commonly known as Beijing time, because Beijing is in the East Eighth Zone! This has several advantages, and of course there are disadvantages!

The advantage is that the time is unified across the country, from Heilongjiang to Xinjiang, the time is unified, and all kinds of documents that require standard time and various trains and planes with precise time do not need to be converted back and forth, what you see is what you get! And all kinds of announcements and announcements are very convenient! Of course, there are advantages and disadvantages, such as 8 o'clock in the east has been work, 8 o'clock in the central and western regions is still night, there is really no way to do this, but as long as you pay attention, there will be no problem at all!

Of course, before the liberation, a multi-time zone system was implemented, and interested friends can learn about it!

Whether you choose to distinguish or unify the time zone, there will be advantages and disadvantages, and there is no question of which is better, but it is very important to unify the specification, as long as there is an enforceable standard.

But it would be a bit troublesome to change it back and forth, such as the previous North Korea changing the time zone!

Because China uniformly uses Beijing time as a unified standard, and it is more convenient to manage, it has never been divided into time zones.

This is for convenience, if there are many time zones like in the United States, then it will be very inconvenient and the time will be confusing.

Although the area of our country is very large, it is still very small compared to the earth, so it will not be divided into time zones.