Where do you watch the 88 constellations all day?

Then this constellation is called Ursa major, and we in China have known these seven stars for a long time. There is a barrel-shaped seven stars in this place. We call it Beidou. Everyone knows the Beidou, so we can use the two stars in the middle of the Beidou to connect to find the North Star. Therefore, Beidou plays a very important role in the process of star recognition. But in China, this constellation is called Beidou. Abroad, think of it as a big bear, in the shape of a bear. Let's take an example, that is to say, there are actually many constellations in the sky, which people realize in the process of continuous accumulation. The starry sky has different names in different cultures. Now that this constellation has been produced, here is a question to talk about your views on this constellation. The appearance of constellations, or constellations, should be a milestone in the course of human understanding of the universe. This is very important when people recognize constellations among the stars. This should be a milestone in our understanding of the universe. Can you convince me by saying so? Why is it a milestone? What reason do you have to say that? Now, I want to point out two points to illustrate this matter. The first point is that when you know the starry sky, that is, the constellation, then people will use this star to understand the changes of the four seasons. Of course, we all know the changes of the four seasons, just say it and you will feel it. Cold in winter and hot in summer, you will feel this way. Therefore, people's initial calendar or their initial understanding of the four seasons depends entirely on people's feelings and the phenomena you see, such as fallen leaves, long leaves, long grass, grass death and so on. In addition, through my own personal experience, it is too hot and too cold, but this calendar is unstable. For example, this spring is early and fast, which means that this spring is likely to be short because of the change of temperature. However, this is entirely based on human feelings. This is not reliable, but one thing can be more reliable, that is, the starry sky in the four seasons is different. You can learn about the four seasons by changing the constellations. It is very regular which stars appear in summer and which stars appear in winter. When people know the constellations, they will use them to judge the seasons. We in China have a very good idea, which is to use the handle of Beidou. Now you can see the handle of Beidou. Then we recorded in books before the Han Dynasty that bucket handle in the east refers to spring, bucket handle in the world refers to summer, bucket handle in the west refers to autumn, and bucket handle in the north refers to winter. Suppose we know the four seasons, I can know which season is coming and which direction it points to by the handle of Beidou. So the same thing happened in the west. For example, in Babylon in the 3rd century BC/KLOC-0, we know that Hammurabi was a very famous king of the Babylonian dynasty. Then in his time, the zodiac, that is to say, the twelve constellations on the zodiac have been finalized. So people know the constellation, he is very early. As I said just now, knowing constellations is an important milestone in the course of human understanding of the universe. One of the reasons is that since we know the constellations, we don't decide the seasons by feeling, but by an astronomical phenomenon. So what do you want to say? What does the change of the starry sky in the four seasons reflect? Actually reflects the movement of the sun in space, so because the earth revolves around the sun. Therefore, the movement of the sun in space actually reflects that the earth is in different positions all year round. Therefore, only by entering the astronomical phenomenon to determine the season can we truly enter the scientific season and truly divide the season scientifically. Therefore, knowing the constellations to determine the seasons should be an important event in the process of human understanding of the universe. The second is that I know the constellations, so there are many astronomical records, so what the ancients recorded is still information that modern astrophysicists can use. I can give you an example. For example, in the Song Dynasty, there was a record in our Song history that during the period from the Song Dynasty to the first year, a guest star appeared in Tianguan, and the guest star was a guest of Hakka. This event actually recorded a supernova event, and it was at that time that a supernova exploded. Because of the constellation, that is to say, it tells you that this happened near Celestial, and Celestial is in modern Taurus. So, the event happened in 1054. Now, what do you see in this place? I saw the crab nebula, which means that the first neutron star we have found now is in this crab nebula. If there were no constellations, this ancient record says that there was a supernova explosion, and you don't know where it happened. But now, thanks to the constellation, we have recorded it in great detail. So, we now know that the supernova that broke out in 1054 has now become a neutron star with a very beautiful nebula around it. Therefore, in these two senses, the constellation is a milestone after human beings know the birth of the universe. I think now, everyone can agree with this view. Because, we have facts to illustrate this matter. The second point I want to talk about the zodiac. Now let's show you the zodiac. We can still see the zodiac clearly. So now there are twelve constellations arranged around this ecliptic. These twelve constellations are the so-called zodiac signs, or the zodiac signs. So now, because people don't necessarily study astronomy, I use a term, "the zodiac". Many people say that I have to find out what the zodiac is first. What are you talking about? Otherwise I don't even know what the zodiac is. If you say the zodiac, it's hard to understand, right? So I want to explain what the ecliptic is here first. If you use this sentence to explain the ecliptic, it may be easy for everyone to understand. That is to say, if the orbital plane around the earth is extended to the sky, this plane is called the ecliptic plane, which is understandable. Assuming that the orbital plane of the earth's revolution is infinitely expanded and made into a plane, then it can form a plane in the sky. This plane is the ecliptic plane. In fact, we ancients didn't know the ecliptic that way. Because the earth moves around the sun, you can't feel yourself moving on the earth. You only see the sun moving, so the trajectory arranged by the sun in the sky for one year is the ecliptic. So the ecliptic is the first time that people know that the ecliptic is such a track formed by the sun in the sky in one year, which is called the ecliptic. So now everyone understands the meaning of the zodiac. Suppose the sun stays in a constellation every month. So it can be said that it is a very important constellation understanding. Let me talk about these twelve constellations on the ecliptic. I also want to say that the excavation of the zodiac, or the understanding of the zodiac, is a milestone or a very important tool for us to uncover the laws of celestial motion in the solar system. It is this zodiac sign that plays a very important role in the process of understanding the laws of celestial motion in the solar system. Why do you say that? Because we know that the planets in the solar system, such as Mercury, Saturn, Jupiter and Mars, basically run on the ecliptic. Although they are not completely on the ecliptic, they are not far from the ecliptic. So, when you know the zodiac, you know the twelve constellations, all the moons, suns and five planets, and now there are nine planets, but you can only see the five planets with the naked eye, that is, Jin Mu, water, fire and earth, that is, you can only know these five planets, other planets, Uranus and Neptune, and you need to look through a telescope. Then, the trajectory of our sun, moon and five stars in the sky has a frame of reference, which is the zodiac. In fact, this truth is the same as that of us sitting in this classroom. When you say which row you are sitting in, it means that one of your abscissa and ordinate is dead. This is to use seats to determine the position of each point in the room. Now, we have twelve constellations on the ecliptic. No matter which constellation this celestial body moves to, I can record it. When recording, because these celestial bodies are moving, where it moves will be recorded gradually. After recording it, people can understand the laws of the sun and the moon. Of course, in China, we have China's own way. In ancient China, there were 28 lodges, which had the same function as the zodiac. Just, suppose in the west, it uses these twelve constellations, and China uses twenty-eight constellations. As we all know, it is Copernicus' celestial theory, that is, before Copernicus, people thought that the sun, the moon and these planets all revolved around the earth. So how did they discover this law of motion? It is because of the zodiac and the twenty-eight nights in China that you can always know the positions of the sun, the moon and the five stars in the sky. Therefore, the Zodiac and China's Twenty-eight Nights reveal the laws of celestial bodies, which is a very important historical event.