On the midsummer solstice, a shadow has been resurrected.

As soon as the summer solstice solar term is over, Yin Qi will start, and the daytime will gradually shorten.

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June 20th or 2 1 or 22nd of the Gregorian calendar every year is the summer solstice, which is one of the 24 solar terms that have been determined for a long time. In the 7th century BC, our ancestors determined the time of summer solstice by measuring the sun's shadow with soil gauge. According to the "Zunxian Manuscript", "The sun arrives in the north, and the day is long and the shadow is short, which is called the summer solstice. At best, it is excellent. "

Therefore, from summer to the sun, the position where the sun shines directly on the ground will reach the northern end of the year, almost directly on the tropic of cancer (23 26' north latitude). Therefore, the days of summer solstice in the whole northern hemisphere are very long. In Beijing, the height of the sun at noon from summer solstice is as high as 73 32'.

China folks divide 15 days from summer to the future into three "hours", usually the first three days, the middle five days and the last seven days. During this period, the temperature in most parts of China was high, the sunshine was sufficient, the crops grew rapidly, and the required water was also high. Therefore, the precipitation at this time has a great impact on crops, so there is a saying that "raindrops are worth tens of millions in summer solstice"

As an important solar term, Solstice has a long history. The origin of the summer solstice is related to the ancient farming culture in China. In ancient times, the summer solstice was the time when farmers were busy in the fields, and it was also the time when crops grew most vigorously. Therefore, people will hold a series of celebrations from the summer solstice to pray for a bumper harvest and good luck.

Summer Solstice is rich in China cultural allusions. One of the most famous allusions is the legend about Fuxi. According to legend, Fuxi was a mythical figure in ancient China. He created gossip on the solstice, which provided a basis for divination and prediction for later generations.

The summer solstice not only plays an important role in China, but also has similar celebrations in other Asian countries and regions. For example, the Japanese Summer Solstice Festival is called "Dragon Boat Festival", which is similar to the Dragon Boat Festival in China, such as eating zongzi and holding dragon boat races. In addition, the solstice in summer is also the time for some western countries to hold summer carnivals and music festivals. People welcome the arrival of summer through music, dancing and celebrations.