1, heavy snow

One of the twenty-four solar terms, which is between February 6 and 8 every year, and the sun is located at 255 degrees of the yellow meridian. The northern region will be affected by cold air, and heavy snowfall often occurs, causing snow on the ground.

Weather

During the solar term of heavy snow, the lowest temperature in most parts of China and Yushan, Taiwan Province has dropped to zero or below. There will be heavy snow, even heavy snow, because of the cold and warm air confrontation area at the front of strong cold air.

as the ancients said, "The great one is prosperous, and the snow is prosperous at this point." It means that this solar term is the starting time of heavy snow and the degree of snow, just like the solar term of light snow, which directly reflects the solar term of precipitation. Therefore, heavy snow refers to snow with heavy snowfall. "Zuo zhuan? Nine years of seclusion: "The flat ground is heavy snow."

2. Winter Solstice

Also known as Winter Festival and Happy Winter, it is one of the twenty-four solar terms and one of the eight astronomical solar terms, which is opposite to the summer solstice. The winter solstice is the shortest day in a year. The winter solstice in the northern hemisphere is generally between February 21 and February 23 in the western calendar, and November is defined by the month of the winter solstice in the lunar calendar.

weather

at the time of the winter solstice, the sun shines directly on the tropic of Capricorn. The winter solstice is also the shortest day and the longest day of the year in the northern hemisphere (north of the Tropic of Cancer). The Arctic Circle is in a state of perpetual night and the Antarctic Circle is in a state of extreme day. After the winter solstice, the direct sunlight position began to move to the north, the daytime hours in the northern hemisphere increased day by day, the sun height at noon also increased day by day, and the sun shadow gradually shortened.

Although the winter solstice is the period when the northern hemisphere theoretically absorbs the least amount of solar heat, there is a time delay in releasing heat from the earth's soil and ocean. In most cases, the coldest period is not around the winter solstice, but after it, such as the great cold. According to the statistics of central weather bureau, the coldest month is October, followed by February, and then February.

Extended information:

"Twenty-four solar terms" is the product of ancient agricultural civilization, and agricultural production is closely related to the rhythm of nature. It is a knowledge system formed by ancient ancestors who followed the agricultural season and recognized the changing laws of the middle age, climate and phenology by observing the operation of celestial bodies; Each solar term represents the different changes of time, climate and phenology.

The twenty-four solar terms express the unique concept of time between man and the natural universe, and contain the long-standing cultural connotation and historical accumulation of the Chinese nation. It not only plays a guiding role in agricultural production, but also affects the ancient people's food, clothing, housing and transportation, and even cultural concepts.

through historical development, the lunar calendar has absorbed the solar terms of the dry branch calendar as a supplement to the calendar, and adjusted it to conform to the tropic year through the leap method, forming a combined calendar of yin and yang, and the "twenty-four solar terms" has become an important part of the lunar calendar. In the international meteorological field, the 24 solar terms are known as "the fifth invention of China". On October 31th, 2116, the 24 solar terms were officially listed in UNESCO? List of representative works of human intangible cultural heritage.

Resources: Baidu Encyclopedia-Twenty-four Solar Terms