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.
Beginning of spring is divided from astronomy. According to the position of the sun on the ecliptic, the year is divided into 24 equal parts, that is, the ecliptic is divided into 24 equal parts, and each equal part accounts for 15 degrees of the ecliptic. The sun runs along the longitude of the Yellow River from zero 15 degrees, which is called "a solar term". It runs 360 degrees every year and * * * experiences 24 solar terms. When the longitude of the sun along the Yellow River reaches 3 15 degrees, it is called "beginning of spring", and the time is usually on February 3-5 every year (around the first day of the first lunar month).