Geography Time zone issues Help

Time zones are hard and fast rules, and no matter where you are, you just have to remember that the time in the east is always earlier than the time in the west. The time zone is defined as the beginning of the 0 degree meridian, and every 15 degrees is the ** meridian of the time zone. For example, the ** meridian in the zero time zone is the 0 degree longitude, which ranges from west longitude to east longitude, and so on for other time zones.

The 180-degree meridian is the dividing line between the old and new dates, in fact, this is also a regulation, the international position of the 180-degree meridian is located a little west of the beginning of the day, and the position of the east is positioned as the end of the day. In other words, the easternmost point of the world is a little west of the 180-degree meridian, and the westernmost point is a little east of the 180-degree meridian. Of course, this is also stipulated, in fact the earth is round, and things are only relative concepts, and here the relative things are absolutely divided into east and west.

That is to say, from west to east from 0 degrees of meridian to 180 degrees of meridian is the eastern time zone, and from 180 degrees of meridian to 0 degree meridian is the western time zone, so that the east and west time zones are fixed, and there will be no situation as you said.

In addition, when calculating the time zone time, you can think of the zero time zone as 0, which is a positive number for the east time zone and a negative number for the west time zone, and subtract the negative number from the positive number to make the time difference between the two time zones. For example, if Beijing is in the East 8th District and San Francisco is in the West 8th District, how many hours are there between the two time zones? We can think of the East 8th District as +8 and the West 8th District as -8, and with +8-(-8)=16, the difference between Beijing and San Francisco is 16 hours.

Again, time zones are hard and fast rules.

The global longitude is 360 degrees and rotates once a day (24 hours), so it is divided into 24 time zones, each spanning 15 degrees of longitude. The site of the Greenwich Observatory is the 0 degree meridian, also known as the prime meridian. The prime meridian ** meridian is called the middle (zero) time zone, there are 12 time zones on each side of the east and west, and the east and west twelve regions are combined into one time zone, and the ** meridian is 180 degrees of meridian.

The calculations about the time zone are:

1. Find the number of known time zones and the meridian and range.

**Longitude = number of time zones * 15 degrees (e.g. 15 degrees * 8 = 120 degrees in East 8 District, i.e. 120 degrees east longitude).

Range: Add or subtract degrees with ** meridian (such as the range of the East Eight District, that is, east longitude to east longitude).

2. Know the longitude of a certain place and ask which time zone it is.

Divide the given degree of longitude by 15, and round up to one decimal place. (e.g. 148 degrees west longitude 148 15 = i.e. 10 west districts).

3. Knowing the time of a certain time zone and finding the time of another time zone.

It's December 1 in Beijing at 16:30, so what time is it in Moscow? What about Toronto?

As can be seen from the figure: Beijing East 8th District, Moscow East 2nd District, Toronto West 5th District (East is positive and West is negative).

Time asked = time given - (time zone given time - time zone sought) Note: If the difference is less than 0, add 24 but the date should be 1 day earlier; If the difference is greater than 24, subtract 24, but add 1 day to the date. Points remain the same.

Moscow 16:30-(8-2)=11:30 Toronto 16:30-(8--5)=3:30

It's December 1 in Beijing at 2:30, so what time is it in Moscow?

2:30-(8-2)=-3:30 -3:30+24=20:30 i.e. 20:30 on November 30

It's 12:30 on December 1 in Toronto, so what time is it in Beijing?

12:30-(-5-8)=25:30 25:30-24=1:30 i.e. 1:30 on December 2

4. International Date Line.

The 12 eastern and western regions are combined into one time zone, and the ** meridian is 180 degrees of longitude. The 180-degree meridian is the International Date Line, which spans east minus one day and west plus one day. The date of the 12 districts in the east and west is one day apart, but the time is the same.

If the East 12th District is 12:30 on January 1, 2010, then the West 12th District is 12:30 on December 31, 2009

No contradiction You take the 0 degree meridian as the standard, the left to 180 is west, and the right to 180 is east.

When calculating the time, look at the time zone, and directly add east and west to subtract it is OK It's actually quite simple If you don't know much, ask me again Hehe

The time zone is not calculated from the 0 degree meridian, and the left and right degrees of the 0 degree meridian are 1 time zone. **Longitude = number of time zones * 15 degrees (e.g. 15 degrees * 8 = 120 degrees in East 8 District, i.e. 120 degrees east longitude).

And so on later

International Date Line Crossing the international date line clockwise will be minus one day without the same time, and conversely, counterclockwise across the country will be reduced by one day. It is important to note that the International Date Line does not coincide exactly with the 180-degree meridian!! They make a difference!!

The main building pays attention to the differences, and often has exam questions!

We're in the Eastern Time Zone, right! It is determined according to the 0 degree longitude, not the 180 degree longitude!

According to the 0 degree longitude in England it is also called the prime meridian.

180 degrees does not count.

If you want to find the time zone, the method of subtracting the left and adding the right is to subtract the time to the left of the time zone and add the time to the right.

However, if you cross the 180-degree meridian, you will subtract one day to the right and add one day to the left, and the time will not change.

One is to judge the direction: judging by the direction of the earth's rotation, the same direction is east.

Time zones are artificially prescribed: things are just names, they are fixed.

Don't get confused.

This kind of question is asked directly to the teacher, and it is not clear to see it, and it is easy for the teacher to accept it when it is demonstrated.

Ask more questions when studying, and the teacher is likely to indirectly reveal the key points of the exam.

First, determine the time difference: subtract (large decrease) from the same area, and add up from different areas.

Add and subtract the number in the time zone: for example, the 10th East Zone and the 1st East Zone are 10-1 with a difference of 9 hours; The East 10 and West 1 districts are 10+1, with a difference of 11 hours).

After calculating the time difference, look at what time a certain area is, add east to west, and subtract it to get the specific time.

For example, the difference between the East 10 District and the East 1 District is 10-1 for 9 hours, and the East 10 District is 8:00 on September 30, then the East 10 District is on the west side of the East 10 District, so the time of the East 10 District is: 8-9=-1, that is, 23:00 on September 29

What is more special is that the difference between the East 12 Districts and the West 12 Districts is 24 hours, that is, the difference between the two sides of the international date line is 24 hours, and the East 12 Districts are one day earlier than the West 12 Districts, and the date is different, but the time is the same.

A little more practice].

The top is the calculation of district time, and the following is the calculation of local time:

The difference in longitude divided by 15° = the time difference [unit: hours], which is calculated according to the east plus west subtraction, the same as above.

1.The same area is subtracted, and the different area is added.

2.East plus West minus.

1l correct solution. After listening, you can practice, such as 10:00 in the East Second District, what time is it in the East Eighth District?

Answer: 8-2=6 10+6=16 So, 16 o'clock, that is, 4 p.m.

See if you've mastered it? == Not extravagant to adopt, if you can, then that.

When we say westward and late, we don't mean watch time.

Rather, it refers to the time when the sun rises.

For example. Beijing is the East Eighth District.

Japan is the East Kowloon ward.

It is said that the sunrise time in Japan is one hour earlier than in China.

Also in the East 10th District, it is an hour behind Beijing.

For example. The sun rises at 6 o'clock around the world at the vernal equinox, and at 6 o'clock Beijing time.

It was still dark in the 10th East Zone, and after an hour, the Earth rotated from west to east.

The East 10th District enters the sunrise, and the Beijing time is 7 o'clock at this time, while the East 10th District has just seen the sun, that is, 6 o'clock in the local area, so.

The watch should be slowed down by 1 hour.

The early and late mentioned in the ten districts are in terms of the sunrise time, and we usually talk about the early and late.

It is said that the watch time of the same place.

8 o'clock is later than 7 o'clock.

It's not the same.

In other words. If you look at it at sunrise.

Due to the Earth's rotation, the sun is seen an hour later in the west than in the east.

The time zone is divided as follows: to.

Prime meridian.

15 degrees (longitude) from east to west is the 0 time zone, then east and west, every 30 degrees is a time zone, and east is the positive time zone (e.g. Beijing.

8 zones to the east) and negative time zones to the west (e.g. New York.

for the West 5th Zone), the East and West time zones finally meet.

International date line.

180 degrees east and west).

China, on the other hand, accounts for five time zones. They are the East 5 districts.

East 6th District, East 7th District.

East 8th District, East 9th District.

Among them, the time in the East 8 District shall prevail.

Take the longitude line where the Greenwich Observatory is located in the United Kingdom as 0 degrees, then east longitude to the east and west longitude to the west. Every 20 degrees is a time zone, adjacent time zones are one hour apart, and so on.

Look at the diagram above. November 10 at 9:15 a.m. Beijing time (8:15 p.m. UTC) is 8:15 p.m. (8:15 p.m. West 5th District Time) and the date is November 9. At this time, it is 0:00 on November 10 and 24:00 on November 9.

So choose D.

Geography is about the first lesson of the second volume of the seventh grade.