Which solar term in the Song Dynasty means long days and short nights?

The summer solstice solar terms in solar term song are long days and short nights. On the day of summer solstice, the sun moves to 90 degrees of the yellow meridian (summer solstice, currently in Gemini), and the position where the sun directly hits the ground reaches the northernmost point of the year, almost directly to the Tropic of Cancer. At this time, the daylight hours in all parts of the northern hemisphere reach the longest in the whole year.

Summer solstice is one of the 24 solar terms. Astronomical experts say that the solstice in summer is the turning point of the sun. After this day, it is about to "turn back". The direct sunlight point starts to move south from the Tropic of Cancer, and the days in the northern hemisphere become shorter day by day. After the summer solstice, the Tropic of Cancer and its northern region, the midday sun height angle also began to decrease. At the same time, after the arrival of the summer solstice, the stars in the night sky gradually became summer stars.

During the "Summer Solstice" period, the middle and lower reaches of the Yangtze River and the Jianghuai Valley are rainy and frequently rainstorm, which is easy to cause floods and even threaten people's lives and property. Attention should be paid to strengthening flood control work.