The place where the earth's axis is located can be said to be very stable, with the north side leaning to the periphery of Polaris, overlooking the earth from the north celestial pole, and rotating at a constant speed from east to west for about 23 hours, 56 minutes and 4.09 seconds. At this time, it is also called "sidereal day" in astronomy, but now it is often said that a day is 24 hours, and it is called "solar day" in astronomy. In particular, sidereal day's reference object is the sun, because the earth's magnetic moment rotates, so the interval of 3 minutes and 56 seconds happens to be the result of the coincidence of the earth's magnetic moment and uniform rotation.
"Earth's rotation" refers to the fitness movement of the earth around the sun. If we can overlook the solar system from the deepest part of the universe, what we hear is that the earth rotates in the opposite direction around the sun, and the rotation trajectory is oval, which is called "rotation trajectory". In an elliptical orbit, the sun is located in one of two focal points.
For example, on June 38+10/October 3 every year, the earth moves to the area closest to the sun, which is called perihelion, while on July 4 every year, the earth moves to the area farthest from the sun, which is called apohelion. Meanwhile, the earth rotates from east to west in the opposite direction. Its track length is about 940 million kilometers, the average angular velocity is 1 degree/day, and the average linear velocity is 30 kilometers/second. When the earth moves to perihelion, its rotation speed is faster, while at apohelion, its rotation speed is slower, and it takes 365.25 days to go around the sun.
The angle between the ecliptic plane and the equatorial plane bisected vertically by the center line of the earth is 66 degrees 33 seconds, while the angle between the ecliptic plane and the equatorial plane is 23 degrees 27 seconds. It is not difficult to see that the earth is not a "standing" ball revolving around the sun, so what makes the earth have an eternal system? Everything in space is rotating, or it can be said that rotation is the basic method of chemical activity in deep space. But to explore this situation scientifically, we must first understand how the solar system and the earth came into being, because the methods of earth rotation and uniform rotation are inseparable from the generation of the solar system.
Research on earth fitness 1. The adaptive motion between the big planets produces a celestial system.
Now most scientists think that the "solar system" is formed by the original star orbit, that is, some gas clouds, but the gas clouds are not hard enough to be seen by the naked eye. Moreover, due to some influence and more than ten thousand times of gravity, gas clouds slowly gather in the middle. After hundreds of millions of light-years of difficult evolution, with the rising temperature of chemicals in the core area, the relative density increases, and finally the core area can reach the level that can cause thermonuclear reaction. Then, after the sun is generated, the residual steam chemicals around it gradually gather in a rotating way, producing a swirling steam layer, which slowly gathers into solid particles through some troublesome processes such as collision, folding and aggregation. After millions of years or even hundreds of millions of light-years of evolution, micro-planets and initial planets were born, until all the celestial bodies in the solar system.
2. The "assistant" of the earth's rotation-angular momentum
The conservation of angular momentum mass plays a leading role in the earth's rotation speed. The original stellar orbit initially carried angular momentum. After the formation of the solar system, the angular momentum of the initial star orbit has not subsided, but has always existed. Angular momentum is only assigned to each star in the software evolution of stellar orbit system, and each star has different angular momentum in the initial stellar orbit. Because of the conservation of angular momentum and mass, planets will rotate faster and faster in the process of gathering and folding. These three elements are the rotation of the earth around the sun, the rotation of the earth-moon system software around the earth, and the rotation of the earth. Are based on the "angular momentum" obtained since the appearance of the earth.
3. Astral body-building exercises have special regularity.
I firmly believe that many people have the idea that the uniform rotation of the earth has been going on at a constant speed. If the earth rotates at a uniform speed and the speed is uneven, the time of day will be different. In the same way, scientist Newton thinks that all objects in the universe are in periodic motion and run in an orderly way according to their own trajectories, otherwise the universe will fall into chaos.
However, scientific research at this stage has confirmed that the earth has been changing, which shows that the earth is in an extremely unstable state, and the rotation speed of the earth is slowly slowing down. Among them, the "ancient human biological clock" is very infectious-according to the preserved protozoan fossils, we find that they can reflect the regular growth and development changes, and then infer the age of microorganisms and the change of the rotation speed of the earth.
The primary factor that causes the earth's rotation speed to slow down is that the sun and the moon attract the earth at the same time, which leads to the "tidal effect" on the earth, and the tidal effect causes the sea level of the earth's house facing the moon and facing away from the moon to rise.
When tides occur at the earth's sea level, the sea surface and the deep sea will rub against each other. In this case, the deep sea can be called a rollover. The rolling sea surface, like the braking system equipment of vehicles, limits the uniform rotation of the earth, and the rolling sea surface reduces the rotation speed of the earth.