What does the vernal equinox mean?

The most special thing about the "vernal equinox" is the "equal share". As the folk proverb says, "The vernal equinox and the autumnal equinox are equally divided day and night". In fact, according to China's own calendar, the meaning of "vernal equinox" is not only day and night. Because this day is also the most right day in spring.

Since ancient times, harmony has been valued in China, which is located at the vernal equinox on the central axis of solar terms, and naturally attracts much attention. The vernal equinox is a grand ceremony of the country. At this time, the scenery outside the window has reached the "middle" season: peaches and plums are half open, wild vegetables are new green, and green plums are like beans. In the poem, the sight of "spring people drinking spring wine and spring birds singing spring sounds" always makes people long for the time in mid-spring.

Astronomical phenomenon of vernal equinox

The vernal equinox refers to the position of the sun between 0 degrees and 15 degrees of the yellow meridian during the period from March 20th to April 5th. But in fact, it usually refers to the day when the sun is really at 0 degrees of the yellow meridian: March 20 or March 2 1. In ancient times, the vernal equinox was also called "Japan-China", "Day and Night Equinox" and "Midspring Moon". On this day, the sun shone directly on the equator of the earth, and the length of day and night was equal, and then the direct sunlight position gradually moved northward. ?

In the traditional method of dividing the four seasons in China, "Li Si" in the 24 solar terms is regarded as the starting point of the four seasons, and "Colorful" and "Erzhi" are regarded as the midpoint. The division of the four seasons in the west takes "dichotomy and dichotomy" as the starting point of the four seasons, such as spring as the starting point and summer solstice as the end point.

Western countries are located at higher latitudes, far from the intersection of Huangchi. Taking "one divided into two" as the starting point of the four seasons can better reflect the local climate than "four stands". In the west, the four seasons divided by "dichotomy and dichotomy" are one and a half months later than those divided by China's traditional "Li Si".

Baidu encyclopedia-vernal equinox

Light. Com- Swallows return at the vernal equinox, the shore is willow green, and the day and night are equally divided.