Why Xining is still so bright at 9:00 pm

The reason why Xining is still so bright at 9:00 p.m. is that it is located in the western part of China, with a longitude of about 102 degrees east, and is also located in the eastern seventh zone. Around the summer solstice, the sun is directly above the Tropic of Cancer, and the polar day phenomenon occurs in the Arctic Circle. As a result, sunset is delayed each day, leading to a delayed night. Even at 9:00 p.m., the sky is still bright. This phenomenon is particularly noticeable in the summer, while in other seasons it gets dark relatively early.