Geography knowledge about time zones is as much as you want

The earth always rotates from west to east, and the east always sees the sun before the west, and the time in the east is always earlier than the west. The difference between the east and west moments is not only measured in hours, but also in minutes and seconds, which brings many inconveniences to people's daily life and work.

In order to overcome the confusion of time, an international conference on the J-Degrees held in Washington, D.C., in 1884, stipulated that the world should be divided into 24 time zones. They are the middle time zone (zero time zone), East 1-12 zones, and West 1-12 zones. Each time zone spans 15 degrees of longitude and the time is exactly 1 hour.

Finally, the 12th East and West Districts each span longitude degrees, bounded by 180 degrees east and west longitude. The time on the **meridian of each time zone is the time uniformly adopted in this time zone, which is called zone time. There is a 1-hour difference in time between two adjacent time zones.

For example, the time in the East 8 Zone of China is always 1 hour ahead of the time in the East 7 Zone of Thailand, and 1 hour behind the time in the East 9 Zone of Japan. Therefore, people who travel abroad must adjust their watches at all times to match the local time. Whenever you go west, you must move your watch forward by 1 hour for each time zone you pass (e.g. from 2 o'clock to 1 o'clock); Whenever you go east, you have to set your watch back by 1 hour (e.g. 1 o'clock to 2 o'clock) for each time zone you pass.

In fact, many countries and regions in the world do not strictly calculate time by time zone. In order to adopt a uniform time nationwide, the time in a certain time zone is generally used as the time of national uniformity. For example, China regards the time in the East 8 District, where the capital Beijing is located, as the unified time of the whole country, which is called Beijing time.

For example, countries such as the United Kingdom, France, the Netherlands, and Belgium, although they are located in the middle time zone, use the time in Zone 1 East in order to match the time of most countries in Europe.

If the time difference is required, you don't have to consider the latitude, just look at the longitude: (1) Use the longitude difference between the two places to calculate the time difference, the longitude difference is 1 degree and the time difference is 4 minutes (15 degrees is 1 hour), and the time zone calculation is every other time zone, and the time difference is one hour. (2) If you know the time of a certain place and find the time of another place, you should mainly judge whether the place you are seeking is located on the east or west side of the known time, and the calculation rule is to add the time difference to the east and subtract the time difference to the west.

3) In the calculation process, if the 180-degree meridian is crossed, that is, the international date change line, then one day will be subtracted when crossing the date line to the east, and one day will be added when crossing the date line to the west. Calculation rules of local time and zone time (1) Calculation range: from the West 12 Districts to the East 12 Districts (excluding the date line).

2) The longitude of a place is divided by 15, and the result is rounded to an integer to be the time zone area code of the place; (3) 15 times the area code of a certain time zone is the ** longitude of the time zone. (4) The time of the unified use of a time zone is the time time where the meridian of the time zone is **. (5) Calculation method:

Time in the Unknown Zone Time in the Known Zone Time Difference. (6) From the known time to the east, the time difference is added, and the time difference is subtracted from the west, that is, the east is added to the west. (7) Calculation of time difference:

If both are located in the Eastern Time Zone or both are located in the Western Time Zone, the time difference is the difference between the area codes of the two time zones; If one of the two places is in the eastern time zone and the other is in the western time zone, the time difference is the sum of the area codes of the two time zones. (8) Search for known time: the meridian where the direct point is located is 12 o'clock; From sunrise to sunset, the midpoint of the daytime is 12 o'clock, or the midpoint of the nighttime period is 24 o'clock, which is 0 o'clock; The intersection of the equator and the morning and dusk line is located at 6 o'clock or 18 o'clock (9) China spans multiple time zones, in order to facilitate use, all parts of the country uniformly use the time of the East 8 Zone, that is, Beijing time.

There are 360 degrees of longitude on the earth, and the world is divided into 24 time zones according to a time zone of 15 degrees. Starting from the 0 degree meridian, it is divided into East 1 District, East 2 District, and East 3 District in the eastward direction. East 12th District; To the west, it is the first district of the west, the second district of the west, and the third district of the west.

West 12th arrondissement. Among them, the West 12th District and the East 12th District occupy a total time zone, bounded by a 180-degree meridian.

The local time of the **meridian in each time zone is the regional time of that time zone. How to find the ** meridian in that time zone? The ** meridian for a time zone is multiplied by 15° by the serial value for that time zone.

For example, the **longitude of the East 8 Zone is 120°E, and the ** meridian of the West 5 Zone is 75°W. For example, the 0 degree meridian passes through London, so the time used in London is the 0 time zone, which is the Universal Standard Time.

For example, Beijing is close to the 120th degree east longitude, so the time of the eighth district of the east is used. First determine the longitude or time zone where one place is located, then find the time zone where you want to go and the place you are in, and determine the direction of the two places, and finally according to the principle of "east plus west minus", you can calculate the time of another place. If you have a friend who goes to school in London and you want to talk to him, you need to choose the right time.

00 (East 8), your friend is still at 4 a.m. and may still be asleep. There is also a special place on the earth, which is the 180-degree meridian, which we call the date line. That is, with 180 degrees as the boundary, the earth is divided into two days.

If you fly east to the United States, you may cross the date line, so you should be careful when calculating the time. The mantra is"East plus West minus"For example, Beijing (120 East 8th District) is now 8 o'clock on the 6th, and what time is it in New York (75 West 5th District). The comparison table counts one by one (the square where Beijing is located is not counted), and the number to the east is added, a total of 11 grids, then 8+11=19, and in the process of counting, because the boundary line is crossed to the east, one day is subtracted (the opposite is the opposite for crossing the daily line to the west), so New York is 19 o'clock on the 5th.

Method 2: You can also use Western Numbers, a total of 13 grids, with minus 8-13=-5There is a minus sign, which proves that New York is still yesterday, side 24-5 = 19, of course there is number 5.

Earth in the Universe – Local Time, Time Zone, and Zone Time Calculation.

The rotation of the earth is almost 24 hours, and these 24 hours were set by the Egyptians. It was probably discovered by observing the rise and fall of the sun, but the specific reason seems to be unknown. In addition, in ancient China, the day was divided into twelve hours. It is divided in this way everywhere, and the timing of its appearance is not consistent.

In the application of the Gregorian calendar, due to the discovery of the inconsistency of universal time in various places, in 1879, the Canadian railway engineer Vullemon proposed the concept of "zone time", which was endorsed at an international conference in 1884, thus formally establishing the "zone time system" that unified the world's measurement time. The "zone time system" states that every 15° longitude range on Earth is a time zone (i.e., the longitude that the sun travels in one hour).

In this way, the entire surface of the Earth is divided into 24 time zones. The "** meridian" of each time zone is specified as 0° (i.e., "prime meridian"), 15° east and west longitude, 30° east and west longitude, and 45° east and west longitude......Up to the 180° meridian, all points within the range on the east and west sides of each **meridian are used as the standard time.

This division of world time zones is based on the prime meridian. The interval from west diameter to east longitude is 15°). From the two boundaries of the zero time zone to the east and west respectively, a time zone is drawn every 15° longitude, and 12 time zones are drawn to the east and west, and the 12th time zone in the east coincides with the 12th time zone in the west. The world is divided into 24 time zones.

Each time zone uses the mean solar time of the ** meridian as the standard time of the zone.

The "zone time system" largely solves the confusion of time in different places, so that there are only 24 different times in the world, and because the time difference between adjacent time zones is exactly 1 hour, it is extremely easy to convert the time between different time zones. As a result, this zonal time system has been used around the world for 100 years.

The division of world time zones is based on the prime meridian. From West Trail 75 to East Longitude 7

5 (longitude interval of 15) is the zero region. From the two boundaries of the zero time zone to the east and west respectively, a time zone is drawn every 15° longitude, and 12 time zones are drawn to the east and west, and the 12th time zone in the east coincides with the 12th time zone in the west. The world is divided into 24 time zones. Each time zone uses the mean solar time of the ** meridian as the standard time of the zone.

There is a one-hour difference in standard time between two adjacent time zones. In principle, the time zone boundaries are divided according to the geographical meridians, but in the specific implementation, they are often determined according to the administrative boundaries or natural boundaries of each country for ease of use. At present, most countries around the world use standard time in zone time, and maintain a full hour difference from Greenwich Mean Time; However, some countries still use the local time of their capital or important commercial port as the country's standard time.

In this way, the difference between standard time and GMT in these countries is not a whole hour, but a difference in times and minutes.

To put it simply, add the eastern time zone (to the east) and subtract the western time zone (to the west).

It can be calculated based on Beijing time, which is the eighth district in the east

The time in the Eastern Time Zone is always earlier than in the Western Time Zone, and the time in each zone increases from west to east. Therefore, if you start from the West 5th District, you will reach the East 8th District by counting 13 time zones to the East. If you count west in the West 5th District, you may get a time zone difference of 11, which is wrong because the international date line is ignored.

If you cross the date line to the west, the date is added by 1.

Let's take an example: if it is now 17 o'clock on September 23 in the West 5th District, then it will be 6 o'clock on the 24th in the East 8th District. If you count from the 5th West District to the west, there are 11 time zones separated by the 8th East District, but in fact, when crossing the 180-degree meridian, the date has been added by 1, so to calculate the time difference between them, it is the earlier time minus the later time.

That is, 6 o'clock on the 24th minus 17 o'clock on the 23rd, the time difference obtained is 13. The wrong answer at 11 o'clock is that it uses today's time (17 o'clock) to subtract tomorrow's time (6 o'clock) (ignoring the international date line), so of course it is not jet lag.

There is a pattern to the problem of time zone differences, and you should all be educated. In the same zone (East or West), the number of time zones with the larger value is subtracted from the time zone with the smaller value; In different zones (East or West), the number of time zones in the two places is added.