Why is the time different between Japan and other countries (the U.S.)?
This is easy to think about. The earth is round and rotates. Therefore, there will always be places where the sun's rays hit the earth and places where they do not. Where the sun's rays hit the earth is daytime, and where they do not hit the earth is nighttime.
In other words, if it is daytime in one part of the earth, it is always nighttime on the other side of the earth. Japan and the U.S. are also roughly related to this front and back. When it is daytime in Japan, it is nighttime in the United States. When it is night in Japan, it is day in the United States. The reason why there is a time difference between Japan and the U.S. and other foreign countries is that the earth is round and rotates.
On the other hand, consider what would happen if there were no time difference and the time were the same everywhere in the world.
If there were no time difference, the time in some country would have to be the same all over the world. For example, let's say that the U.S. is the standard. Then, only the country of the U.S. can set the time to wake up at 7:00 a.m. and noon at 12:00 p.m. Japan, however, cannot do so. However, this is not the case in Japan.
Because of the 14-hour time difference between Japan and the U.S., 12:00 noon in the U.S. is 2:00 in the morning. If all the countries in the world eat lunch at the U.S. lunch time, Japan has to eat at 2:00 am.
This is a big problem. That is why we decided on a time difference. Because of the time difference, people in any country in the world can eat lunch at 12:00 pm.
