March 2 1 What's the special significance?

201March 2, 91is the vernal equinox of 20 19. Starting today, the days in the northern hemisphere are getting longer and shorter, while the nights in the southern hemisphere are getting shorter and shorter.

The vernal equinox of the twenty-four solar terms is on March 20th every year (or 2 1). The vernal equinox has special significance in astronomy. On the day of the vernal equinox, the sun moves to 0 degrees of the yellow meridian, which is the vernal equinox. "Twenty-four solar terms" said: "In mid-February, it will be divided into half, which is half of ninety days, so it is called division." On this day, the sun shines directly on the equator, and day and night are almost equal all over the world.

The vernal equinox means that the 90-day spring is divided into two halves, and from then on, it enters the season of bright spring and flowers. At this time, the sun is due east, the yin is due west, the day and night are equally divided, and the cold and heat are balanced, which is the best time of the year. However, spring mountain is full of children's songs, and it is also a time of anxiety. The so-called spring and autumn equinox "spring women think, Qiu Ren is sad" means that spring women feel positive and think of men; Autumn scholars feel yin and think of women, materialized, so sad.