Say good to travel around the world for 80 days, why one less day? --- International Date Line The daily boundary line is the beginning of a new day on Earth and the end of an old day. The east of this line is a new day, and the west is an old day. But in fact, the daily boundary line does not completely coincide with the 180° meridian, but has several twists and turns. In order to save energy, some countries will adjust the time by 1 hour in the summer, which is called daylight saving time.

Last time I talked about the international date change line.

As we said earlier, because the earth rotates from west to east, the time in the east is earlier than the time in the west.

You can look at the following picture, more clearly.

If you go abroad, the destination country and our country are jet lag, remember to adjust the time. If you cross the daily line when you go abroad, remember to adjust the date.

But now it's all smartphones, and if you can access the Internet, your phone will automatically adjust. Just remember to adjust your watch.

In practice, the timing methods implemented by countries are not exactly the same as those in zone time.

Some countries use different zones according to the time zone in which the territory is actually located, such as the United States, Russia, Indonesia, etc., and several zones are used within these countries, that is, the time within the country is not uniform.

In these countries to take the plane, to see whether there is a time difference between the take-off place and the landing place, the aircraft take-off time is the local time of the take-off place, the landing is the local time of the landing place, if the time difference between two cities in the same country, you must be careful. Remember to arrange the itinerary and don't let the pick-up driver wait.

Some countries, such as Australia, feel that they are inconvenient to manage when they use zones that are half an hour apart.

When some countries uniformly adopt the district where the capital is located, for example, in China, when we adopt the East Eighth District where Beijing is located, that is, "Beijing time". I still think we are so convenient in China.

However, some countries like Russia, the east-west span is too large, if they all use a time zone, people are not convenient to work and live, so countries adopt different time zone management methods according to their actual conditions.

Countries that use daylight saving time are basically located in the middle and high latitudes, because the summer is early, and turning the time faster can make everyone turn on the lights less and save energy.

Countries located at low latitudes generally do not use daylight saving time, because the four seasons are not clear, and there is no problem of bright morning and evening. Especially in countries located on the equator, the day and night are equally long throughout the year, and there is no daylight saving time.

Our country used to practice daylight saving time, but now it is not used.

Well, that's it for the international date line.