Why is it late and dark in summer in Yunnan?

Most of the reason is that Yunnan uses Beijing time, but its actual geographical location is shifted to the west by about one time zone. This leads to six o'clock, which is actually five o'clock. Suppose that the actual sunrise and sunset times in summer are five o'clock and nineteen o'clock. Then, when the sun rises and sets, the watch will show six and twenty o'clock.

As we all know, the earth is round. China is a vast country. The sun rises and sets in the west, and Yunnan is the westernmost part of the motherland. In the process of the earth's rotation during the day, in the eastern cities such as Shanghai, the sun will gradually disappear after five o'clock in the afternoon, so when it is dark in the eastern part of the motherland and the sun is still high in Yunnan.

In summer, if the weather is fine, it won't get dark in Yunnan until after 7: 30 in the evening. Around the summer solstice, Yunnan will not be completely dark until after 8 pm.

Yunnan is a low latitude and high altitude area with the longest sunshine time in the world. Because of its high altitude and geographical location inland, it is difficult for monsoon from Indian Ocean, Arctic Ocean and Pacific Ocean to reach a wide range of cold and warm airflow, and rarely meet here. Therefore, the weather changes smoothly, with the most sunny days and longer sunshine hours throughout the year.

In addition, because the plateau air pressure is relatively low, the clouds formed are relatively high, and there is little reflection on the sun's light, and most of the sun's light can go directly, so the sunshine time is longer.