What is the constellation that will never be seen in the night sky in Shanghai?

There are unsinkable stars at every latitude. These stars are called "Gong Ji Stars". If you are at a latitude of 30 degrees, the stars within a radius of 30 degrees of the north celestial pole will not sink below the horizon, but will always revolve around the north celestial pole.

Similarly, in the southern half day, the stars within the radius of 30 degrees of the South Pole can never rise to the horizon for you to see, including the constellations around the South Pole, such as the South Pole, the fly, the compass, the cuckoo and Aquarius.