What Does the Sun Revolve Around?

When Galileo studied the sunspots in 1610, he found that some regular movements of the sunspots were the result of the rotation of the sun. The existence of the sun's rotation can be confirmed by the movement of sunspots and other active objects on the sun, such as sundial, dark bars and speckles, or the Doppler effect of the spectral lines on the east and west edges of the sun. The direction of the sun's rotation is the same as that of the earth. Rotational velocities are different at different latitudes. At the solar equator, the rotation is the fastest. The higher the latitude, the slower the rotation. This indicates that the sun has a poorer rotation.

Sun rotation

The solar system is centered on the sun and an assembly of all celestial bodies constrained by the sun's gravity: 8 planets, at least 165 known satellites, and 5 identified dwarf planets (

Sun rotation

It has long been noticed that the sun's rotation rate often changes. In 1904, Hamm discovered that the solar rotation rate observed from 1901 to 1902 was different from that observed in 1903. In 1916, Plasket observed that the change in solar rotation rate reached 0.15 per second within a few days. Km; accurate observations of Howard and Harvey in 1970 show that the rate of solar rotation varies from day to day. However, the law of the sun's rotation rate with time is still unclear. It is neither faster nor slower, but swings between a certain upper and lower limit. Many people also observed and studied the poor rotation of the chromosphere, corona, and solar magnetic sector structure. The rotation speed of the chromosphere and corona is similar to that of the photosphere. Some observations indicate that the corona rotation speed is slower than the photosphere rotation speed at certain solar latitudes and varies with the phase of the solar cycle. As for the boundary of the solar magnetic field fan structure, it does not change as expected based on the theory of poor rotation, but presents a rigid rotation. The internal rotation of the sun cannot be directly observed, and can only be indirectly speculated. For example, based on the statistical law of the average rotation speed of the main sequence star, the relationship between angular velocity and the age of the star and the ionized calcium emission line, or the lithium-beryllium abundance of the sun. Speculate. Some scholars believe that the internal rotation speed of the sun is faster than the surface, and some scholars believe that it is slower than the surface, and their views are not consistent. The theoretical research work of the poor solar rotation only started in the 1960s. Because of the great progress in understanding the large-scale circulation in the solar troposphere, the theory of the poor solar rotation was proposed based on the turbulence theory. The basic idea is that the small-scale convection of rice grains and super rice grains can be regarded as a kind of viscous effect. Due to the interaction of non-axisymmetric global scale convection and rotation, the angular momentum is transferred to the equator, thereby forming the sun Poor rotation.