Beijing time
China adopts Dongba time zone where Beijing is located as the standard time, which is called Beijing time. Beijing time is the average solar time of east longitude 120 degrees, not the local average solar time in Beijing. The geographical location of Beijing is116Degrees 2 1', so its local average solar time is about 14 minutes later than Beijing time. Beijing time is 8 hours earlier than world standard time.
The earth is divided into 24 equal parts every week, and each equal part is a time zone. Such a time zone is longitude 15 degrees. 24 hours a day, so a time zone is one hour apart. The time of longitude zero, that is, meridian, is the world standard time. Because the meridian passes through Greenwich City near London, it is called Greenwich Time, which is also the standard time in Britain. The longitude of Beijing is 1 16 degrees 2 1 minute, so it is in the eighth time zone east of the meridian. Which is the Dongba time zone. 8× 15 = 120, so the time zone of Dongba is east longitude 120 degrees, which is Beijing time.
So where is Beijing time calculated and published? It is the national time service center in pucheng county, Shaanxi Province. The reason for choosing this place is that Shaanxi is located in the hinterland of the mainland, only 100 km away from the origin of China, and the transmitted time signal is convenient to cover the whole country; The local geological structure is stable, and the coefficient of time service center being damaged by earthquakes and other disasters is very small; Because of its importance, it is safer to build in inland areas.
1 sec, which we are talking about now, is actually the time of 9 19263 1770 cycle of cesium atomic transition oscillation, which was officially defined by 1967 at the 13th international chronograph conference held in June. Internationally, the starting point of atomic time is 0: 00: 00 of 10 Universal Time 1958+ 1.
1968 10 In June, the National Time Service Center of Chinese Academy of Sciences was completed.
1970 12 15, Time City began to broadcast short waves to the whole country. Within 3,000 kilometers of Fiona Fang, people heard the familiar "... this national unified" Beijing Time "was broadcast from such a remote mountainous area and such a mysterious compound.
China spans five time zones.
China is divided into five time zones:
(1) Central time zone: the central longitude is 120 degrees.
(2) Longshu time zone: East longitude 105 degrees as the central meridian.
(3) New Tibet time zone: 90 degrees east longitude is the central meridian.
(4) Kunlun time zone: 75(82.5) degrees east longitude is the central meridian.
(5) Changbai time zone: the central longitude is 135( 127.5) degrees.
The "standard time" of a time zone is only the unified time in a large area and the "artificial" time that everyone abides by, not the "local time (LMT)"-the real longitude time of every place in the time zone. This principle is used anywhere in the world to add and subtract the longitude of the birthplace and the standard time of the birthplace.
For example, the Central Plains time zone includes Inner Mongolia, Liaoning, Hebei, Shanxi, Shandong, Henan, Anhui, Jiangsu, Hubei, Hunan, Jiangxi, Zhejiang, Fujian, Guangdong, Hainan, Hong Kong, Macau and Taiwan Province Province. When the clock strikes 12 at noon in this large area, only the position on the east longitude 120 degree line is 12, and all other places are less or more than 12. For example, Hong Kong is located at east longitude 1 14 degrees 10 minutes, and 5 degrees and 50 minutes west of east longitude 1 1: 36: 40.
"Beijing time" is the time zone of Dongba time zone used in China, and the longitude of the central meridian of this time zone is east longitude 120. According to the international standard time zone division method and the geographical location of China, although China spans five time zones, it is mainly located in Liu Dong time zone, Dong Qi time zone and Dongba time zone. The longitude of the central meridian in these three time zones is 90, 105 and 120 respectively. If China is located in Dongwu time zone west of East longitude 82.5, the same standard time as Dongliu time zone will be adopted. When the East Kowloon time zone east of East longitude 127.5 adopts the same standard as the East Eighth time zone. The use of these three time zones covers the whole country, which basically meets the requirements of taking the time in transit as the time standard. When "Beijing time" is still the Dongba time zone standard, Dongba time zone and Dongba time zone adopt standard time 1 hour and 2 hours later than "Beijing time" respectively, and the time names can be named "Chongqing (municipality directly under the Central Government) time" and "Xinjiang Tibet time" respectively. Or the standard time names of Liu Dong time zone, Dong Qi time zone and Dongba time zone are named "Western Time", "Central Time" and "Eastern Time" respectively.
According to China's administrative divisions, Beijing time applies to Beijing, Tianjin, Hebei, Liaoning, Jilin, Heilongjiang, Hohhot, Inner Mongolia Autonomous Region and the eastern part of Baotou (including Hohhot and Baotou), Shandong, Shanxi, Henan, Jiangsu, Anhui, Hubei, Hunan, Jiangxi, Zhejiang, Shanghai and Jiangxi. Chongqing time applies to Chongqing, Sichuan, Guangxi Zhuang Autonomous Region, Yunnan, Guizhou, Shaanxi, Qinghai, Gansu, Ningxia Hui Autonomous Region, Hohhot and Baotou, Inner Mongolia Autonomous Region, and Xinjiang Tibet time applies to Xinjiang Uygur Autonomous Region and Xizang Autonomous Region.
Therefore, the national time service center shall prevail.