Da Xue is the 21st solar term among the 24 solar terms, and the third solar term of winter. Dou Zhi Gui, the sun reaches 255 degrees in the Yellow Meridian, and the solar term is from December 6th to 8th every year in the Gregorian calendar. The Da Xue solar term marks the beginning of the sub month in the Chinese lunar calendar, indicating the official start of the mid winter season. The Big Snow solar term, like the Small Snow solar term, is a solar term that reflects the trend of temperature and precipitation changes. It is a reflection of ancient agricultural culture on festivals. Heavy snow is a solar term that reflects climate characteristics, characterized by a significant decrease in temperature and an increase in precipitation.

The Great Snow Festival is a climate concept that represents the climate characteristics during the period of the Great Snow Festival, namely temperature and precipitation. The meaning of heavy snow during solar terms is different from that of heavy snow during weather. In fact, the snow during the heavy snowfall season is often not as heavy as during the light snowfall season, and the season with a large amount of snow throughout the year is not during the light snowfall or heavy snowfall season. In the middle and lower reaches of the Yellow River, where the 24 solar terms are used to measure shadows, the solar term with heavy snowfall throughout the year is neither "light snow, heavy snow" nor "small cold, big cold", but rather the "rain water" solar term in spring. The amount of snow during the heavy snowfall season is not significant. Zhengzhou Junda Instrument Co., Ltd. wishes everyone to wear more clothes and keep warm in cold weather.