When will it light up slowly?

In the three northeastern provinces, the summer sky usually begins to brighten slowly around 2: 30 in the morning. The time of the sun above the horizon is about 15 hours, while the day length in Mohe County of Heilongjiang Province is more than 17 hours. The difference between the two ends of China is more than 4 hours.

In summer, during the summer solstice, the sunshine time in China is getting longer and longer from south to north. However, because the Yangtze River Basin in central China has entered the rainy season from summer solstice, the sunshine time is generally short, and the total sunshine hours during the summer solstice are between 60 and 90 hours.