There is a question about the world time, when is the world time determined

Humans have developed for so many years that there is no need to make a fuss about naming the seasons, but why do they all use 24 hours a day, 365 days? The answer is very simple, this is all added by later generations. In China, for example, the Chinese named the twelve hours after the twelve heavenly stems, and one hour is two hours, which is a commentary added by later generations.

As for the 365 days, this is all deduced by the ancients according to the movement of the planets, even modern scientists are also deduced from the movement of the stars, the stars are still the stars, why can't they count 365 days. Therefore, in the Yuan Dynasty of China, there was such an accurate calendar as the chronological calendar, even if the solar calendar of the Mayan civilization pretending to be a ghost was counted to 360 days, how could other ancient civilizations not be calculated. For the sake of the unity of historical time, even if the calculated results are different, they will still be counted as 365 days.

Looking at the world, it is not difficult for us to find that no matter what nationality you are, but you have the ability to speak, you have the ability to walk, you will call mom as soon as you are born, these are human instincts, ancient apes must have a subconscious understanding of time in order to survive, and these abilities are then inherited by us, so we humans have a common unspoken understanding of time, plus the timekeeping of ancient humans is carried out through hydrology, astronomy and other phenomena with common characteristics, and the four ancient countries are all agricultural civilizations, so they attach great importance to the growth cycle of crops It just so happens that the latitudes of the four ancient kingdoms were about the same, so the ancient civilizations were strikingly similar in terms of timing. (The above is just my conjecture).

And I think it has something to do with the biological clock, like we have three meals a day, and we have to sleep at night.

In 1960, world time was widely used as a basic time measurement system.

It is not a uniform time system due to the influence of changes in the speed of rotation of the Earth. However, because it is related to the angle of the Earth's rotation, world time is still necessary for everyday life, astronomical navigation, geodetic surveying, and spacecraft tracking, even after the function of measuring time was replaced by almanac time in 1960. At the same time, accurate universal time is one of the basic data of the earth's rotation, which can provide necessary basic information for the study of the earth's rotation theory, the earth's internal structure, plate movement, ** forecast, and the origin and evolution of the earth, the earth-moon system, and the solar system.

In the earliest days, people used the earth's rotational motion to measure time, and the basic unit was the mean solar day. At the end of the 19th century, 1 86,400 of a mean solar day was used as a second, which was called the universal time second.

Due to the irregular changes in the rotation of the earth and the long-term slowing down, the world time changes year by year and cannot be kept constant. Therefore, the accuracy of the reproduction second by this definition can only be 100 millionths of a second.

1. What exactly is time? People have been searching for the answer to this question for more than 1,000 years. In ancient Greece, for example, the question of the definition of time bothered philosophers more than mathematicians.

After Galileo's great discoveries, Newton finally defined time as a mathematical quantity. However, the great British scientist believed that time is an object covered with a mysterious atmosphere, because time is independent of any object, above everything, absolute. Time is so close to the saints that God is compared to a clock.

2. Albert Einstein believed that time is not at all like a "free dog" in nature, but a real scale. Even today, we still can't define time in the same way that we define anything practical.

We can measure time, but we don't know what time is, and we hang "time" on the wall or on our wrist.

According to Einstein's theory of relativity, we know that time can be extended or shortened. That's why physicists simply use time as a sequence of events and mark them with time. For example, a person's birthday or the expiration date of food, etc.

As fast as the earth turns, so does the second hand in time.

Time is a parameter of the development of things that human beings themselves prescribe.

Albert Einstein said that time and space are an illusion of human cognition. The big ** theory holds that the universe starts at a starting point, which is also the starting point of time.