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Heavy Snow is the 21st of the 24 solar terms in the lunar calendar, and the third solar term in winter, marking the official beginning of the midwinter season when the sun reaches 255 degrees of ecliptic longitude. "The Collection of the Seventy-Two Hours of the Moon Order" says: Heavy snow falls on the eleventh day of the lunar month, and the snow is heavy at this point. Heavy snow means that the weather is colder and the possibility of snowfall is greater than that of light snow. It does not mean that the amount of snowfall must be heavy. During the heavy snow solar term, the sun’s ecliptic longitude reaches 255 degrees. Heavy snow, as the name suggests, means heavy snowfall. The ancients said: The big one is prosperous, and the snow is prosperous at this point. During this period, snow often falls heavily and covers a wide area. At this time, the minimum temperature in most areas of our country has dropped to 0°C or below. Often in areas where warm and cold air meet at the front of strong cold air, heavy snowfall or even blizzards will occur. It can be seen that the heavy snow solar term refers to the starting time and snow amount of heavy snow during this period. It is the same solar term as light snow, rain, Guyu and other solar terms, which directly reflects precipitation. The heavy snow season is divided into three periods: the first period is when the hawks stop singing; the second period is when tigers begin to interact with each other; and the third period is when litchi trees emerge. It means that due to the cold weather, the cold trumpeting birds no longer sing at this time; this is the period when the Yin energy is at its peak, so-called peak and decline, the Yang energy has sprouted, and tigers have begun to engage in courtship behavior; Li Ting is a kind of orchid, and it feels the sprouting of Yang energy and sprouts. It is often said that auspicious snow heralds a good harvest. Snow covers the ground in severe winter, keeping the temperature on the ground and around crops from falling too low due to cold waves, creating a good overwintering environment for winter crops. When the snow melts, it increases soil moisture content to meet the needs of crops for spring growth.