What does the vernal equinox mean? Uncover the origin of the vernal equinox solar terms
4hw.com.cn: the spring equinox is one of China's traditional 24 solar terms. The spring equinox returns to spring, and everything is full of vitality. Do you know what the spring equinox means? How did the spring equinox come about? Let's take a look with Xiaobian.
What does the vernal equinox mean? What is the origin of the vernal equinox
The vernal equinox, also known as' day in 'and' day and night in ancient times, is on March 20 or 21 every year, when the sun reaches the Yellow meridian 0 & deg;. According to the collection of the seventy-two seasons of the lunar order: "in the middle of February, half of the time is divided, which is half of the ninety days, so it is called the division." In addition, the "spring and autumn dew? Yin and Yang in and out part I and part II" said: "in the spring equinox, yin and yang are half the same, so day and night are both cold and summer." Therefore, the meaning of the vernal equinox, first, refers to the equal division of day and night, 12 hours each; Second, in ancient times, spring was from the beginning of spring to the beginning of summer. The spring equinox was divided equally among the three months of spring.
On the day of the spring equinox, the sun shines directly at the equator, and the day and night are almost the same. The difference is that the northern hemisphere is spring and the southern hemisphere is autumn. Then the direct sunlight position gradually moves northward, the solar radiation obtained by the northern hemisphere gradually increases, the weather warms day by day, and the day is getting longer and the night is getting shorter. Spring equinox solar terms, affected by the intersection of cold and heating groups, there should be more rain.
As the saying goes: 'spring equinox wheat gets up, fat and water should follow closely'. A spring rain, a warm, busy farming after the spring rain. The busy spring season is about to begin. Spring management, spring ploughing and spring planting are about to enter the busy stage. After the spring equinox, overwintering crops enter the growth stage, and field management should be strengthened. As the temperature rises rapidly and the water demand is relatively large, farmers should strengthen water storage and moisture conservation.
The above is the content of "what does the vernal equinox mean and why is it called" compiled by Sihai Xiaobian for everyone.