The summer solstice is one of the twenty-four solar terms and the fourth solar term in summer. It usually falls on June 2 1 or 22 of the Gregorian calendar. The summer solstice means that it has really entered the hot season, which means to arrive at the extreme.

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

That is to say, the day is long until the summer solstice, and the time is shorter day by day from this day, and it is shorter until the winter solstice, and the time begins to get longer day by 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. On the summer day, the sun shines directly on the Tropic of Cancer, and the daytime in the northern hemisphere is the longest, and the longer it goes to the north, the day length in Haikou is about 13 hours, in Hangzhou it is about 14 hours, and in Beijing it is about 15 hours.

The summer solstice is one of the twenty-four solar terms, and it is also one of the important festivals in China. In the past, the summer solstice was as grand as the Dragon Boat Festival. As far back as the Song Dynasty, the court officials and the people held grand sacrificial ceremonies on this day, in order to make the weather smooth and make the country prosperous and the people safe. Due to the continuation of the times and the precipitation of time, many folk customs have been formed in the summer solstice.