On March 20th, in the warm sunshine, we welcomed the fourth of the twenty-four solar terms - the Spring Equinox. At this moment, the spring river is warm, flowers are blooming, orioles are gentle, and swallows are returning. A beautiful spring scenery is about to unfold to us. Swallows return and flowers bloom. Around March 20th every year, when the sun reaches 0 degrees in the yellow longitude, the spring equinox arrives. The vernal equinox, also known as the "day middle" or "day night equinox" in ancient times. The vernal equinox is characterized by a balance between yin and yang, resulting in a balanced day and night balance and a balance between cold and heat. The word "fen" expresses the two meanings of the spring equinox: on the one hand, it refers to the equal division of the day and night, and on the other hand, it refers to the equal division of spring. Therefore, the spring equinox is a period of balance between yin and yang, equal day and night, and half temperature and cold throughout the four seasons of the year. There is a folk saying that goes, "Spring is not warm, summer is not hot, autumn is not cool, and winter is not cold." This "two parts and two solstices" has become the standard solar term that best represents the characteristics of the four seasons. If the keywords for the winter solstice and summer solstice are "extreme" and "most", then the keywords for the spring equinox and autumn equinox are "average" and "average". On the Spring Equinox and Autumn Equinox, the sun shines almost directly on the Earth's equator, with almost equal length of day and night in various parts of the world. There is no phenomenon of polar day and night, and a special phenomenon of the sun rotating on the horizon all day can be observed near the North and South Poles. After the Spring Equinox, the days in various parts of the Northern Hemisphere gradually lengthen and the nights gradually shorten, while in various parts of the Southern Hemisphere, the days gradually shorten and the nights gradually lengthen. With the increase of sunshine time, the temperature gradually rises, and most parts of China enter the period of the fastest temperature rise in a year. More and more regions are embracing spring. The Spring Equinox has three seasons: the first season is when the Xuanniao arrives; Second Hou Lei spoke out; Start power on three days. The Xuan bird is also known as the swallow. In ancient times, swallows came at the spring equinox and left at the autumn equinox. As the weather warmed, swallows flew back to the north from the south and began to carry grass, mud, and build nests for breeding; During the Spring Equinox season, the first thunder has already sounded in most southern regions, and the Yellow River Basin has only begun to hear the first spring thunder. Lightning, a weather phenomenon caused by intense collisions of cold and warm air, can only be seen in the third season of the Spring Equinox. At the spring equinox, a hundred flowers are blooming. After the beginning of spring, rain, and the awakening of insects, the warm atmosphere of the north and south of the Yangtze River blends harmoniously. The spring breeze blows for thousands of miles, blooming a hundred flowers. The willows on the shore are green, and the fragrance of rapeseed flowers is fragrant. Peach red and plum white welcome spring yellow. At this time, although the weather has become increasingly warm, there is a large temperature difference between day and night, alternating between cold and warm. Sometimes, the temperature rises briefly, which can easily create the illusion of "summer has arrived". Therefore, since ancient times, there has been a saying in our country that "in the second and eighth lunar months, people dress randomly". During this period, the wind often showed two faces, sometimes "blowing the cold willow wind" and sometimes "the fierce wind sweeping through ten thousand branches and flowers". When gentle, it was like a pair of hands soothing the heart, and when wild, it was merciless. There is a saying in the folk that "the spring equinox wind is not small, and one should avoid deep pain and disturbance". At this time, one should be cautious of getting cold, prevent abdominal pain and diarrhea, adjust clothing according to weather changes at any time, add appropriate clothes in the morning and evening, and pay attention to keeping the head and feet warm to prevent disease attacks. Sunbathing the head and back to replenish the yang is one of the four seasons and eight seasons, and its importance is beyond doubt. Accompanied by it are many customs, one of which is very cute and interesting, which is "laying eggs". The sun, moon, yin, and yang are evenly distributed in the sky, and the mysterious bird does not refuse