Summer solstice noodles-something related to summer solstice

Solstice is the earliest of the 24 solar terms. In the 7th century BC, the shadow of the sun was measured by civil soil gauge, thus the summer solstice was determined. The annual summer solstice begins on June 2nd1day (or 22nd) and ends on July 7th (or 8th). According to "Zunxian Manuscript", "The sun arrives in the north, the days are long and the shadows are short, so it is called the summer solstice. At best, it is excellent. " On the day of summer solstice, the sun directly reaches the northernmost point of the year, almost directly to the Tropic of Cancer (23 26' north latitude), and the daytime in the northern hemisphere is the longest, and the farther north it is, the longer it is. For example, the daily length of Haikou in Hainan is a little more than 13 hours, Hangzhou is 14 hours, Beijing is about 15 hours, and Mohe in Heilongjiang can reach 17 hours. From summer to the future, the position of direct sunlight on the ground gradually moves southward, and the daytime in the northern hemisphere is shortened day by day. There is a folk proverb that "eating noodles on the solstice in summer will shorten the day". At this time, the southern hemisphere is in the middle of winter.

Experience "standing upright without shadow"

On the solstice in summer, the sun shines almost directly on the tropic of cancer. In Guangdong, Guangxi, Yunnan and other regions on the tropic of cancer, there will be an interesting phenomenon of "standing without a shadow" due to the vertical irradiation of the sun. Although Chongqing is not on the tropic of cancer, if you look at your own shadow at noon, you will also see the shortest shadow in a year.

"After eating summer solstice noodles, the day became shorter."

There is a folk saying that "the summer solstice is the longest day in the northern hemisphere", which means that the summer solstice is the longest day in a year, and then the sun gradually moves south, and the days in the northern hemisphere become shorter day by day.