Solar term winter solstice measuring point

The vernal equinox is the midpoint of 90 days in spring. One of the 24 solar terms, around March 20 of the Gregorian calendar every year, when the sun is located at 0 (vernal equinox) of the yellow meridian. On the vernal equinox, the sun shines directly at the equator of the earth, and the seasons in the northern and southern hemispheres are opposite. The northern hemisphere is the vernal equinox and the southern hemisphere is the autumnal equinox.

During the summer solstice, the direct sunlight on the ground reaches the northernmost part of the year, almost directly reaching the Tropic of Cancer. At this time, the daylight time in the northern hemisphere reaches the longest in the whole year. For the Tropic of Cancer and its northern area, the summer solstice is also the highest day of the year at noon. On this day, the northern hemisphere received the most solar radiation, almost twice as much as the southern hemisphere.

The solstice in winter is just the opposite of the solstice in summer. The position where the sun shines directly on the ground reaches the southernmost point of the year, almost directly on the tropic of Capricorn. At this time, the daylight hours in all parts of the southern hemisphere reach the longest in the whole year. For the Tropic of Capricorn and its south, the winter solstice is also the highest day of the year at noon. On this day, the southern hemisphere received the most solar radiation, almost twice as much as the northern hemisphere. This is why, in winter, China is very cold, and some people go to countries in the southern hemisphere (such as Brazil and Australia) for the summer.

Winter solstice (English: winter? Solstice), also known as "Winter Festival" and "Happy Winter", is one of the twenty-four solar terms in China and one of the eight astronomical solar terms, which is opposite to summer solstice. The winter solstice begins when the sun reaches 270 degrees of the yellow meridian, which is about 65438+February 22 of the Gregorian calendar every year. According to legend, the solstice in winter is the New Year's Day of the Zhou Dynasty in history, and it was once a very lively day.

On the winter solstice, the direct position of the sun on the ground reaches the southernmost point of the year and almost directly reaches the Tropic of Capricorn (23 26' south latitude). On this day, the northern hemisphere gets the least sunshine, 50% less than the southern hemisphere. The days in the northern hemisphere are the shortest, and the farther north they are, the shorter they are.

More generally, there is a custom of eating jiaozi from winter solstice in northern China. As the saying goes, "When winter solstice comes, eat jiaozi." In the south, we eat jiaozi, but there are exceptions. For example, in Tengzhou, Shandong Province, the solstice in winter is called Jiujiu, and the custom of drinking mutton soup on that day is very popular, which means driving away the cold.