What is the difference between local time and district time?

The concept of local time and regional time understands and distinguishes local time refers to the different times (hours) caused by different longitudes, and this kind of different times in different places is called local time. This concept is difficult for students to understand and can easily be confused with the times. Guide students to understand the place like this:

In people's consciousness, it is generally regarded as 12 noon when the sun is directly above a certain meridian (Shangzhongtian), so that we can use the relative early and late occurrence of 12 noon in various places to determine that there are different moments in different longitudes (i.e., local time). For example, during the rotation of the earth, the morning and evening of each meridian at 12 noon are different, and the timing of each meridian is also different. At this time, 120°E is 12 noon, and the meridians of 30°E, 75°E, 165°E are 6 o'clock, 9 o'clock, 15 o'clock, and so on, respectively.

From this, it can be concluded that all meridians have their own places, and different longitudes have different places. There are countless meridians in the world, and there are countless places, and when you use them, it will cause confusion in time.

For the convenience of use, people divide the world into a time zone every 15 degrees of longitude, and the world is divided into a total of 24 time zones. And it is stipulated that each time zone is used as the time when the ** meridian of the time zone is used as the time when the whole region is used together, which is the time of the whole region, so that in a time zone, although there are countless local times, there is only one time zone, that is, the time of the ** meridian; There are 24 regional hours in the world. In this way, it is easy for students to understand the concepts of local time and regional time and the differences and connections between them.

Zone time is a large area, and there are many local time in a country, so it is necessary to stipulate district time to make sure that the time of the country is consistent. The world is divided into 24 zones, each with a time difference of one hour. That is to say, the longitude is every one degree, a difference of four minutes, and because the earth rotates from west to east, the time of east longitude is greater than that of west longitude.

That is to say, the further east you go, the greater the time until you reach the East 12th District.

Local time is determined by the sunrise and sunset time of the sun in a certain place, and is calculated based on the equatorial sunrise time (6 o'clock). The time limit is artificially fixed, and every fifteen degrees of longitude is a time zone.

1. The scope is different.

Local time refers to the time (hour) that is different due to different longitudes, and this kind of time that is different in different places is called local time. Within a certain area, a time is uniformly used, and this time is called district time.

2. The quantity is different.

When all meridians have their own places, and when there are different places in different longitudes, there are countless meridians in the world, and there are also countless local times.

For the convenience of use, people divide a time zone every 15 degrees of longitude in the world, and divide a total of 24 time zones in the world, and stipulate that each time zone is the time of the ** meridian of the time zone, as the time of common use of the whole region, which is the zone time.

3. The warp threads are different.

Different moments occur depending on the longitude, which is called local time. The time of the longitude where the meridian is located is the time common to the whole region (the meridian divisible by 15 degrees of longitude is the ** meridian of the time zone), and this time becomes the time of the time zone.

The "zone time system" largely solves the confusion of time in different places, so that there are only 24 different time 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.

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

Zone time refers to the time of the ** meridian for each time zone. For example, Beijing is located in the 8th East District, and the Beijing time we use every day is the district time of the 8th East District, but this time only refers to the time on the meridian of 120° east longitude.

Local time can refer to a specific time in any place, and the longitude of a specific place is different, and the time of a specific place is also different.

When Beijing time belongs to the eighth eastern district, it is based on the ** longitude of the time zone: 120° east longitude.

In this time zone, Beijing time (East 8th District Time) is used to unify the time.

Beijing local time is generally calculated based on the accurate longitude, and the "true" time of Beijing is the east longitude.

There is a difference of 1° in longitude and 4° in time.

So when it's 12 noon Beijing time, Beijing time should be 11:44 local time.

In short, zone time is a unified time in a time zone with ** meridian as the standard.

Local time is the time that is accurately located in longitude, such as 108°, 116°.

Local Time Due to the rotation of the Earth from west to east, the sunrise will be seen earlier than the location located in the west at the same latitude. As a result, there are different moments depending on the longitude, called local time.

Longitude is every 15 hours, local time is 1 hour, and longitude is 1°There is a difference of 4 minutes in local time. All places on the same meridian are the same in local time.

Interpretation of local time:

the meridian that divides the day hemisphere equally, the local time of which is 12 noon; The meridian opposite it is 0 (or 24) points in local time. At the equator, the meridian that intersects the morning line is 6 o'clock in its place and 18 o'clock in the place of the meridian (dusk line) opposite it. On the equator, the sun rises at 6 a.m. and the sunset time is at 6 p.m.

In other latitudes, the time of sunrise is the time of sunrise when the meridian intersects the morning line, and the time of sunset is the time of sunset when the meridian line intersects the evening line.

Time zone and zone time.

Time zone The world is divided into 24 time zones according to longitude, each time zone spans 15° longitude and is based on the prime meridian, and the range of east and west longitude is divided into degrees as the zero time zone (also called the middle time zone), and then every 15° is a time zone. The time zone east of the zero time zone is the eastern time zone, which is divided into the east zone 1 - the east 11 zone; The time zone west of the zero time zone is divided into one west zone - the west eleventh zone, and the east twelve and west twelve zones each occupy a longitude, that is, each is half a time zone, so the two are combined into a complete time zone, called the east and west twelve zones, and the world is divided into 24 time zones. As the Earth rotates from west to east, from zero hour to east, the time increases by one hour for each additional time zone, and decreases by one hour for each additional time zone to the west.

The West 12th District has 24 hours less time than the East 12th District.

Zone Time Within a certain area, a kind of time is uniformly used, and this kind of time is called district time. Zone time is also called standard time, each time is used in the time zone ** longitude is located in the place of the longitude for the whole area of the time (the longitude divisible by 15 is the ** meridian of the time zone), this time becomes the zone of this time zone, in the zone time, in addition to the east and west twelve zones, any two adjacent time zones, the zone time difference is one hour, between any two time zones, a difference of several time zones, the zone time difference is a few hours. In terms of timing, the easterly time zone is earlier in the zone time; The westerly time zone, the later the zone time.

For example, when the East 8th District is 12 o'clock, the East 10th District is 14 o'clock; The west 2nd district is 2 points. That is, the East 8th District is 10 hours ahead of the West 2nd District and 2 hours behind the East 10th District.

The sunlight hits point A directly, so the meridian where point A is located is 12 o'clock, and the meridian where point C is located is 24 points. The equator is of equal length of day and night, so 90° east of A (when there are 6 regions) and 90° west (when there are 6 regions) are daytime, B is the intersection of the morning line and the equator, which is the boundary between day and night on the equator, and the distance from point A must be 90°, 12:00 (when point A is local)-6 (when 90° represents 6 regions) = 6:

00, so point B must be 6:00. In the same way, the intersection of the dusk line and the equator is 12:

The longitudinal line of the north and south is used to determine the time, and the latitude is not used.

When judging the place:

It is 12:00 if it is in direct sunlight, 6:00 if it is the meridian where the morning line and the equator meet, and 18:00 if it is the meridian where the dusk line and the equator are located.

In addition, every 15 degrees of longitude is a time zone, and for a point, 15° east adds 1 hour, 15° west subtracts one hour, and so on.

For the date line (most of the date line coincides with the 180° meridian, but in order to ensure that the date is the same on a piece of land as much as possible, the date line has twists and turns), the west of the date line is the xth day, and the east of the date line is the (x-1) day.

Local time is the time when the longitude is different, the longitude is different in different places, and the zone time is the place where the meridian is 1 time zone**, the time zone is different, and the zone time is different.

local time. Time around the place. Every day when the sun is on the head, people often say:

It's 12 noon. This statement is true for a definite place. For example, when we are in Shanghai, it is 12 o'clock when the sun shines on our heads.

But at the same time, about 1,700 kilometers west of Shanghai, the sun is still one hour away from the headshot in the easterly direction, that is, it is only 11 o'clock for the place. On the contrary, about 1,700 kilometers east of Shanghai, the sun has already moved west for one hour, and it is already 1 o'clock in the afternoon. In short, different places have their own noon, or different places have different local times.

However, in our daily life and work, we all use "Beijing time" as the standard. And not with the time of their respective places. Because for a country, if each place uses local time, it will make the work order of the whole country chaotic, and it will be impossible to arrange all work in a unified manner.

District Time (District Time).

A type of time measured by a globally harmonized system of time zones. Whenever the sun shines on your head, it's 12 o'clock in the afternoon. But the time it takes to see the sun as a headlight is different in different places.

For example, when it was 12 noon in Shanghai, it would take five hours for the residents of Moscow to see the sun shining on their heads. And it was already 2 o'clock in the afternoon for Sydneysiders in Australia. Therefore, if the local time standard is used in each locality, it will cause a lot of inconvenience to administrative management, transportation, and daily life. In order to overcome this difficulty, astronomers have come up with a solution:

Divide the world's longitude every 15 degrees apart, so that there are 24 regions in total. A uniform time standard is applied within each region, known as 'zone time'The difference in zone time in adjacent areas is 1 hour.

When people go east from one area to one area, they set their clock one hour faster, and when they walk through several areas, they move a few hours faster. Conversely, when people go west from one area to an adjacent area, they set their clocks back by one hour, and by several hours when they walk through several areas. In airports and other transportation centers, the districts corresponding to major cities in the world are often represented on maps for the convenience of passengers.