The beauty of the festival · summer solstice 丨 summer solstice to the longest day

Xinhua News Agency, Nanjing, June 21 (Reporter Zhu Xiao and Wang Xun) "Chinese Astronomical Calendar" shows that at 17:14 on June 21, Beijing time ushered in the summer solstice solar terms. As one of the "two -divided two -to -two" solar terms, the summer solstice is of great significance in astronomy and daily life.

According to the "Capture of the Constitution": "The north to the north, the sun is long, the sun shadow is short, so it is said to be the summer solstice." The sun runs to the northernmost time of the equator, and the front of the north is reappeared. When the summer solstice is coming, the northern hemisphere is the longest, the sun is the highest at noon, and the shadow of vertical objects is the shortest. The interesting phenomenon of "no shadow" in the region on the back of the north will appear.

Regarding the summer solstice, the people have the saying that "but the summer solstice is not hot" and "the summer solstice three Geng will be countless." Zhang Yan explained that although the summer solstice day, although the longest day and the highest height angle, the temperature was not the highest of the year. Because the calories close to the surface at this time are still saving, the temperature will often rise in the dozens of days after the summer solstice.

"In the summer solstice, the keywords of the weather in our country are high temperature, humidity and thunderstorms." Jiang Xiaodong, an associate professor of the School of Applied Meteorological, Nanjing University of Information Technology, said that at this time, except for the Qinghai -Tibet Plateau and the central and northeast regions, most areas have entered summer. The North China Plain is high -temperature sun, while the middle and lower reaches of the Yangtze River and Jianghuai areas are in the rainy period. It is the most rainfall throughout the year.

Summer solstice is also an important period of agricultural production. Zhang Binbin, an associate researcher at the Institute of Fruit and Tree of Jiangsu Academy of Agricultural Sciences, introduced that during the summer solstice, early rice enters the critical period of output. Vegetables, fruit trees, etc. also gradually entered the peak harvest season. In order to celebrate the harvest and worship the gods, the ancients often held activities such as sacrifice ancestors, land gods, and water gods on the summer solstice.

In Beijing, Shandong and other places, there are customs of eating noodles in the summer solstice. The ancients chose to eat noodles on this day, hoping to eat "short" during the day. In Nanjing, Jiangsu, people choose to make pea cake on the day of summer solstice, also known as the "summer solstice cake", which not only appetizes the heat, but also means rising, safe and healthy.

[Editor in charge: Qiu Lifang]

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