Introduction of summer solstice solar terms

The summer solstice solar terms are introduced as follows:

Summer solstice is one of the 24 solar terms and the fourth solar term in summer. Generally on June 2 1 or 22 of the Gregorian calendar. The solstice of summer means that it has really entered the hot season, which means reaching the extreme.

The solstice in summer has the longest day. From this day on, the time of the day becomes shorter and shorter, and after the winter solstice, the time of the day becomes longer and longer.

That is to say, the day is longer than the summer solstice, and the time is shorter every day from this day, and it is shorter in the winter solstice, and the time is longer every day. This is the so-called "long to the summer solstice, short to the winter solstice."

Extended data

Because science was underdeveloped in the past, we can only judge the phenomenon of time change according to practical experience, and now the scientific explanation is clearer. In summer, the sun shines directly on the Tropic of Cancer, and the daytime is the longest in the northern hemisphere, and the longer it goes to the north, the daily length of Haikou is about 13 hour, that of Hangzhou is about 14 hour, and that of Beijing is about 15 hour.

Summer solstice is one of the 24 solar terms, and it is also one of the important festivals in China. In the past, the solstice in summer was as grand as the Dragon Boat Festival. As far back as the Song Dynasty, the officials and people of the imperial court held a grand sacrificial ceremony on this day, in order to have a good weather and make the country and the people safe. Due to the continuation of the times and the precipitation of time, many folk customs were formed on the solstice of summer.