I don't understand how the stars in the galaxy rotate.

The center of the Milky Way is the intersection of the rotating axis of the Milky Way and the galactic plane, and the core of the Milky Way-the silver core is in the direction of Sagittarius. As far as right ascension and declination are concerned, in 2000 it was right ascension 17 degrees 45.6 minutes and declination-29 00'. This "point" is not far from the northwest of gamma star, near the dividing line between Ophiuchus and Scorpio.

The earth moves around the sun, and the sun is not fixed. It also revolves around the center of the Milky Way, the center of the Milky Way. So, how does the earth rotate relative to the Milky Way?

While the sun revolves around the center of the Milky Way, it also takes the whole solar system around the Milky Way. The orbit of the entire solar system is very close to a circle with a radius of 25,000 to 28,000 light years, and that of period of revolution is 225 million to 250 million years. This period is roughly the same as the rotation period of the cantilever Orion arm where the solar system is located, so the solar system is basically in this cantilever. This is also an important reason why the short-lived earth can evolve advanced life, because the cantilever makes the solar system leave the dangerous supernova gathering area, so that life on earth can gradually evolve in a long-term and stable environment.

How does the Earth rotate relative to the Milky Way? Here are the answers.

The rotation periods of the earth and the solar system are very close. Considering that the earth revolves around the sun, we only need to make some corrections. The sun rotates around the galactic center at a speed of about 220 kilometers per second with a radius of 25,000 to 28,000 light years. The rotation speed of the earth around the sun is about 29.783 kilometers per second, which is only one order of magnitude different from the revolution speed of the sun, but the rotation radius is far from it. The earth's rotation radius is1.500 million kilometers, which is only 0.0000 1.59 light years when converted into light years, which is nine orders of magnitude different from the sun's rotation radius. This huge gap allows us to completely ignore the revolution of the earth and directly replace the rotation of the earth with the rotation of the sun. The earth revolves around the sun, and the pattern of the solar system revolving around the Milky Way was determined 4.6 billion years ago. For billions of years, this model has been fixed and has not changed.