Is the division of time zones consistent with the division of longitude 5?

Name: Local time by country – time zone.

Content. 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 longitude conference held in Washington, D.C., in 1884, stipulated that the world 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 slow down the watch by 1 hour for each time zone you pass; Whenever you go east, you have to move your watch forward by 1 hour every time you pass a time zone.

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.

China spans 5 time zones.

China is divided into five time zones:

1) Central Plains time zone: 120 degrees east longitude as the **meridian.

2) Longshu time zone: 105 degrees east longitude is the **meridian.

3) New Tibet time zone: 90 degrees east longitude as the **meridian.

4) Kunlun time zone: 75 degrees east longitude (degree is the **meridian.

5) Changbai time zone: 135 degrees east longitude (degree is the **meridian.)

Of course it's inconsistent, you just look at the globe and understand.

Time zone calculation formula:

A time zone = [a longitude 15 ° zone + zone], where the degree of meridian loss is divided into east and west, [the mathematical meaning of x+ is: round x to the whole number.

Personal summary formula, don't spray if you don't like it).

For example, the time zone of 87°E is: [87°E 15° Zone + Zone] = [Zone + Zone] = Zone E6, that is, the East 6th Zone.

The formula for calculating the zone time:

Time in Zone A - Time Zone B = (Time Zone A - Time Zone B) 1h zone, where the time zone is calculated according to the eastern time zone, and the western time zone is calculated according to the negative eastern time zone. Personal summary formula, don't spray if you don't like it).

In addition, zone time is defined as: the ** meridian where the time zone is located.

The local time is the regional time of that time zone.

The zone time definition involves the meridians, and the meridians are calculated by the following formula:

a**meridian = a time zone of 15°, where the time zone is divided into east and west. Personal summary formula, don't spray if you don't like it).

The definition of zone time relates to local time, and the formula for calculating local time is:

A local time - B local time = (a longitude - b longitude) 15° h, where longitude is calculated according to east longitude and west longitude is calculated according to negative east longitude. Personal summary formula, don't spray if you don't like it).

1. Time difference. The world has adopted and followed the system of time differences, and the time calendars of all countries are based on this system, which is designed according to latitude and longitude;

2. The time zone corresponds to the 24 hours of a day, that is, it meets the 24-hour return to the original point, and the 24-hour time zone covers the whole world;

3. Zero time zone. The principle of coordinate axis is used to explain, which is convenient for the calculation of time difference by addition and subtraction rule;

4. In order to meet the existence of 24 time zones and zero time zones, East 12 and West 12 are only half the size of their early time zones;

5. Time calculation of different time zones: the same subtraction and different addition, east plus west subtraction, "same" refers to the same in the east time zone or the same in the west time zone, then the two time zones are subtracted, and "different" is the opposite, following a world map centered in the zero time zone, the time zone sought is in the east of the land type known time zone, then the result of the same subtraction and difference plus the time of the known time zone, otherwise it is minus, and the time zone of the time zone is in the longitude range of the time zone and the longitude line zero time zone.

A time zone 15 degrees of longitude. The official time zone division stipulates that the United Kingdom (the former site of the Greenwich Observatory) is the middle time zone (zero time zone), east zones 1-12, and west zones 1-12. Each time zone spans 15 degrees of longitude and the time is exactly 1 hour.

Due to the different longitudes of countries and regions in the world, the local time is also different, so it will be divided into different time zones. The official time zone division consists of 24 time zones, each of which is represented by an English letter. A time zone is divided every 15° longitude, with one exception, each time zone has a **meridian; For example, GMT belongs to the "Z" zone, so it is usually followed by the suffix "Z".

A time zone 15 degrees of longitude. The official division of the time zone stipulates that the United Kingdom (the former site of the Greenwich Observatory) is divided into the middle time zone (segment or 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.

Due to the different longitudes of countries and regions in the world, the time of shaking hands is also different, so it will be divided into different time zones. The official time zone division consists of 24 time zones, each of which is represented by an English letter. A time zone is divided every 15° longitude, with one exception, each time zone has a **meridian; For example, GMT belongs to the "Z" zone, so it is usually followed by the suffix "Z".