How many time zones does an earth have?

The time of the same meridian is the same, and the rotation of the earth is 24 hours. This has nothing to do with the height and temperature of the sun. I think your idea is influenced by sundials, because sundials use the height of the sun to determine time.

Since the two places are on the same meridian line, the sun rises and sets at the same time, so the height of the sun does not affect the time.

For judging the time of an area, only the sunrise and sunset times can be used.

So the northern half of the A meridian is 3 points, and the southern half of the A meridian should also be 3 points.

What does it have to do with the time and the height of the sun, the temperature, for example, the time of sunrise is the same everywhere on the same meridian, and the time of sunset is the same, so the time is the same, because the two points are on the same meridian, so the time is the same, both are 3 o'clock. I was in my first year of high school, and I learned geography in my first year of high school, and I just learned these things.

His sun is at a different height, and his temperature is different What does it have to do with the time, the same meridian time is the same.

The northern half of the A meridian is 3 points, and the southern half of the A meridian is of course 3 points.

The same meridian time is the same" This sentence is true, I ask you, what grade are you studying now, and when you read the first year of high school, you will naturally understand, as for the northern half of the A meridian is 3 points, then the southern half of the A meridian should be 3 points.

Universal time refers to the time in the middle time zone, i.e. the 0 degree longitude.

is also known as Greenwich Mean Time.

World. Refers to the standard time of the location of Greenwich and is also a form of expressing the rate of rotation of the Earth. A time measurement system based on the rotation of the Earth.

The angle of the Earth's rotation can be measured by the motion of the local meridian relative to a fundamental reference point on the Earth. In order to measure the Earth's rotation, two basic reference points were chosen on Earth: the vernal equinox (see equinox solstice) and the Flat Sun Point, and the times determined from this are called sidereal time and Solar Time, respectively.

Greenwich is home to the former Royal Greenwich Observatory in the southern suburbs of London, England, the prime meridian of the Earth.

The demarcation of the world, the starting point of the world's calculation of time and longitude. It is known for its maritime history, as the standard point of the prime meridian, and for its name after Greenwich Mean Time. It's a rugged and scenic place with a mix of history and place, and it's London's gateway to the East on the River Thames.

Zone 1 East: Amsterdam, Berlin, Rome.

Zone 2 East: Istanbul, Cairo, Jerusalem, Cape Town.

Eastern Zone 3: Leningrad, Moscow, Baghdad, Tehran.

East 4th District: Karachi.

Zone 5 East: Yekaterinburg, Islamabad, Mumbai, New Delhi.

Zone 6 East: Almaty, Dhaka, Colombo.

Zone 7: Bangkok, Hanoi, Jakarta.

Zone 8: Beijing, Chongqing, Shanghai, Hong Kong (most cities in China are in this time zone) Zone 9: Adlaide, Darwin, Pyongyang, Seoul, Osaka, Tokyo.

East 10: Closed Island, Canberra, Sydney.

East 11th District: Magadan, Solomon Islands.

Zone 12 East: New Zealand – Wellington, Marshall Islands.

West 12th District: Enivertok Island, Kwajalein Island.

West 11th District: Midway.

West 10th District: Hawaii.

West Kowloon: Alaska.

West 8th District: Seattle, San Francisco, Los Angeles.

West 7th Side: Salt Lake City, Arizona.

West 6th District: Mexico City, Houston, Atlanta.

West 5th District: Washington, New York, Lima.

West 4th District: Caracas.

Zone 3 West: Rio de Janeiro, Buenos Aires.

West 2nd Zone, West 1st Zone: The remaining two time zones are sea areas, and there are basically no cities.

The time zone relationship between the Sun and the Earth is that the time it takes for the Earth to revolve around the Sun is one year (days).

The Earth's revolution around the Sun refers to the periodic rotation of the Earth around the Sun. The orbit is an ellipse that is very close to a perfect circle, with an average angular velocity of 360 degrees per year and a flat velocity of 940,000,000 kilometers per year.

The Sun and the Earth

The average distance between the Earth and the Sun is about 100 million kilometers, which is already very impressive compared to the Earth with a diameter of less than 10,000 kilometers, and even if light can travel 300,000 kilometers per second, it takes more than 8 minutes to travel from the Earth to the Sun.

It takes a year for the Earth to revolve around the Sun, so if you know how long the Earth is around the Sun, you can calculate how fast the Earth revolves around the Sun, which is about 30 kilometers per second.

The sidereal cycle of the Earth's revolution is called the sidereal year. This unit of collapse is obtained by using the star as a reference point. During a sidereal year, the center of the Earth, as seen from the center of the Sun, orbits the Sun from a point in the background of the star, and then returns to the same point in the sky.

Overview of time zones.

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.

Thoughts on jet lag:

1.Where does jet lag come from?

There is no uniform conversion method for time usage in various countries, which causes inconvenience to transportation and communication. For the sake of unification, the world adopted and followed the system of time difference, and the time calendars of all countries were based on this system.

2.Why 24 time zones?

I cope with 24 hours 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.Why is there a zero time zone?

It is explained by the principle of coordinate axes, which is convenient for the calculation of time difference by adding and subtracting the law.

4.Why are East 12 and West 12 only half the size of other time zones?

To meet the existence of 24 time zones and zero time zones.

5.Time calculation in different time zones?

The same subtraction is different, and the east is added and the west is subtracted.

"Same" means that if they are in the same eastern time zone or in the same western time zone, then the two time zones are subtracted, (e.g. if East 8 and East 5 are both in the eastern time zone, then 8 5 3.) "Different" is the opposite.

Following a map of the world centered with a zero time zone in the middle, the time zone sought is east of the known time zone, plus the time in the known time zone. Otherwise, it is minus.

The Earth's time zone is divided into 24 time zones; Calculation method: Zone time to be calculated = known time zone - (time zone when known zone - time zone when zone to be calculated), where the time zone in the Middle East is positive and the West time zone is negative.

Taking the Greenwich Observatory in London as the zero time zone, the international method of dividing a time zone every 15 degrees of longitude is adopted, and the east is from East 1 to East 12, and west is West 1 to West 12, and the time in the east is earlier than that in the west.

Among them, the time zone with 0° meridian as the ** meridian is the middle time zone, also known as the zero time zone, from which to the east to 180° is the east 1 to the east 12 districts, to the west to 180 ° is the west 1 to the west 12 districts, and the east 12 and west 12 districts each span longitude, all of which are half-time zones.

As the Earth rotates from west to east, from time zero to east, the time increases by 1 hour for each additional time zone, and decreases by 1 hour for each additional time zone to the west. The West 12th District has 24 hours less time than the East 12th District.

Each time zone is 15°, the middle time zone is centered on the 0° meridian, and the left and right, from the east and west meridians to the east and west are 15 ° respectively, which is the east (west) zone 1 and the east (west) zone 2. East (West) 11 districts, the rest, also 15°, this is (East-West) 12 districts.

The Earth is currently divided into 24 time zones.

China uses the time of the East 8th District, where the capital Beijing is located, to use the time uniformly across the country.

Calculating: Zone time to be calculated = known time zone - (time zone when known zone - time zone when zone to be calculated), (Note: East time zone is positive, West time zone is negative).

The following is an example: Example 1: It is known that the time in Beijing (East 8th District) is 12:00 on May 1

00, find the ward time of Tokyo (East 9th Ward)? Tokyo time = 12:00 - (8-9) = 13:

00 (13:00 Tokyo time on May 1st)

The earth always rotates from west to east, the east always sees the sun before the west, and the time in the east is always earlier than the west, so it is reasonable to divide the 24 time zones.

Because there are 24 hours in a day, and the rotation of the earth in one day is 24 hours, the time is not uniform, so it is divided into 24 time zones.

Because the speed of the earth's rotation is 24 hours, a place is in a different time zone for each period.

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