When does it get dark in August in Northeast China?

The darkness and dawn of an area are related to its latitude (horizontal) and longitude (vertical) coordinates.

From summer to the sun, the sunrise time in Changchun, Jilin Province is 4 o'clock, and the sunset time (not equal to the dark time) is 19:25. The dark time is about 7:50. There is little difference between Harbin, Shenyang and Jilin, but in Hohhot, Inner Mongolia, the sunrise and sunset times are 5 o'clock and 20 o'clock respectively. (Source: Sunrise and Sunset Time Inquiry)

Latitude analysis: In summer, the sun moves in the Tropic of Cancer, that is, in the north of the earth. Therefore, at the same longitude, the farther north you go, the later it gets dark. For example, there is extreme day in the Arctic, that is, it is open all day and there is no night. My hometown is in Shanxi, and it gets dark at 8: 20 at the latest in summer, while Kunshan, Suzhou, where I have been, gets dark at 7: 20.

Longitude analysis: The sun rises in the east and sets in the west. Therefore, at the same latitude, the farther east, the earlier the morning and the earlier the darkness; The farther west you go, the later the morning and the later the dark.