When did spring begin?

February 5 1972 beginning of spring, Saturday (the 21st day of the twelfth month of the Year of the Pig).

Beginning of spring is the first of the 24 solar terms, also known as the first day of the first lunar month, the establishment of the Spring Festival, the beginning of a year, and so on. In ancient times, the method of "bucket handle Acupoint" used bucket handle and the Big Dipper in beginning of spring to point to Yin. The current method of "fixing qi" divides solar terms, and the vernal equinox begins when the sun reaches longitude 3 15.

Beginning of spring is not only the first of the 24 solar terms, but also in nature and people's minds, spring means warm weather, flowers and birds, the growth of all things and the sowing of spring. The so-called "one year's plan lies in spring". In climatology, spring refers to the period when the average temperature is between 10℃ and 22℃. Speaking of beginning of spring, people obviously feel that the days are getting longer and the sun is getting warmer. Temperature, sunshine and rainfall are often at the turning point of the year and tend to rise or increase. [ 1] [4]

Beginning of spring solar terms began, westerly jet, the southern branch of East Asia, began to weaken, and the winter climate was coming to an end. However, the intensity and location of the northern branch of westerly jet remain basically the same, the Mongolian cold high and Aleutian low are still relatively strong, and gale cooling is still the prevailing main weather. However, during the intermission under the influence of strong cold air, the frequency of southerly winds increases, accompanied by an obvious warming process.