In ancient China, the vernal equinox was divided into three periods: the first was the arrival of Xuanniao, the second was the sound of thunder, and the third was the beginning of electricity. It means that after the equinox, swallows begin to fly back from the south. When it rains, the sky will thunder and flash. The flower letters represented by the three vernal equinox periods are as follows: "one for Begonia, two for pear and three for Magnolia.". 'when three flowers bloom, there are thousands of spring flowers, and a hundred flowers compete for favor. The vernal equinox is recorded in the ancient Chinese calendar as: "three days before the equinox, the sun enters the equator.".
According to Yueling 72 Hou Ji Jie: "in the middle of February, it is half of the ninetieth day, so it is called" Fen ". In addition, it is said in the first and second chapters of the spring and Autumn Annals: in the vernal equinox, yin and yang are in half phase, so the cold and heat are even day and night. It is said in the first calendar of the Ming Dynasty that the point where the Yellow meets the red is the equinox of day and night. Therefore, the meaning of vernal equinox is: first, the day and night of a day are equally divided, each of which is 12 hours; second, in ancient times, from the beginning of spring to the beginning of summer, the vernal equinox is equal to the spring in the three months of spring.
Spring equinox: Xuanniao arrives
"At the equinox of spring, Xuanniao comes. '
Xuanniao, also known as yuanniao, is the swallow. Swallows are migratory birds that come at the spring equinox and go at the autumn equinox.
Vernal equinox: Lei Nai's voice
Thunder is the sound of Yang Qi in spring. Yang Qi is struggling to break through the obstruction of Yin Qi. It is rumbling, but there is no lightning. In summer, the sun is strong, and once blocked by the rain, it thunders before the rain, and the thunder is louder. This is the interpretation of Lei in traditional Chinese learning.
Thunder is phonation: Yin and yang are thin, which is called thunder. At this point, the four Yang are gradually flourishing, and Yin Yan is still there, so the thin phase is phonation. Yunhui says: "it's difficult to get out of Xiang Qi. The annotation says: "if you send out, you will come out.". '
Spring equinox: the beginning of electricity
[the third time of equinox, the beginning of electricity] lightning began to appear.
The first electricity: electricity, sunshine also; four Yang Sheng long, the value of gas vent when light Yan. Therefore, "Li Jie" says: "every sound is Yang; light is Yang. The book of changes says: "thunder and lightning are in harmony. "Gongyang Zhuan" also says: "electricity, thunder. "Yes, Xu said:" thunder Yang, electricity Yin. 'No. When there is no thunder in midsummer, there is also electricity.