It is not visible everywhere, only in the northern hemisphere.
Polar Star is a bright star in the northern part of the sky, very close to the North Celestial Pole, almost directly opposite the Earth's axis. Polaris is also called Beichen, Zi Gong and Zi Wei Yuan. Zi is the name of Xuan, and the Purple Palace is also the Xuan Palace. The heroine in the palace is Yin Dexing, who is the Nine Heavenly Xuannv of Yanzi.
About 15,000 to 13,000 years ago, the North Star was named Vega after the Zhinzi Weaver Girl, which originated from the ancient Han people's natural worship of ancient stars. Hence the name Polaris.
Extended information:
Polaris is about 434 light-years away from the earth, and its mass is about 4 times that of the sun. It is a bright star far away from the earth. In the constellation diagram, it Right at the tip of the bear's tail. Gou Chenyi is also a triple star.
Due to the special name of Polaris, many people think that Gouchenyi is very bright, but in fact the brightness of Gouchenyi has basically reached the resolution limit of the human eye at night under normal weather in the city. This is why many people watched it when they were children. I read popular science books and learned about the reason why Polaris could not be found in the northern sky. Unless the weather is very clear at night, Gouchenyi is difficult to find directly.
Because the Earth rotates around its axis, and Polaris is very close to the northern extension of the Earth's axis, so when you look at the sky at night, Polaris is almost motionless, and it is in the north direction above your head, so it can indicate north.
Baidu Encyclopedia-Polaris