What is the solar term for Haitang to enter the dry face mud?

Begonia flowers into dried mud are the vernal equinox of solar terms.

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The vernal equinox is one of the 24 solar terms and the fourth solar term in spring. The longitude of the sun reaches 0, and the festival is held on March 19-22 of the Gregorian calendar every year. The vernal equinox has two meanings. One is "equal seasons".

Traditionally, spring is between beginning of spring and Long Summer, and the vernal equinox is in the two solar terms, which just divides spring equally. Another meaning is "equal day and night". At the vernal equinox, the sun shines directly on the equator, and the length of day and night is equal, each being 12 hour. The climate of the vernal equinox is characterized by warm and sunny weather.

The vernal equinox is of great significance in astronomy. On the day of the vernal equinox, the sun shines directly on the equator, and the northern and southern hemispheres are divided equally day and night. Since then, the direct position of the sun has continued to move from the equator to the northern hemisphere. In the northern hemisphere, the day begins to be longer than the night, while in the southern hemisphere, it is the opposite.

Climatically, there are also obvious characteristics. After the vernal equinox, China has entered a beautiful spring except the Qinghai-Tibet Plateau, Northeast China, Northwest China and North China. At this time, China folks have the custom of flying kites, eating spring vegetables and laying eggs.

Twenty-four solar terms are the product of ancient farming civilization in China, which has a long history and is related to the time of gossip. In the process of cultural exchange and communication of historical development, four solar terms (vernal equinox, autumnal equinox, summer solstice, winter solstice) of China's "twenty-four solar terms" reflecting the return movement of the direct point of the sun spread throughout the pre-Qin period.

The division of the four seasons in the west is based on the dichotomy, that is, spring is divided into beginning of spring. The vernal equinox in the "vernal equinox" became the New Year in Uzbekistan, Turkey, Afghanistan, Iran and other countries, which lasted for more than 3,000 years. Twenty-four solar terms were introduced to Japan more than 1000 years ago, and some solar terms were also included in Japan's statutory wishes (festivals). Vernal equinox is a public holiday in contemporary Japan.

During the vernal equinox, yin and yang in nature account for half, so the principle of balance between yin and yang should be followed in daily diet to maintain the balance, coordination and stability of body functions.

In addition, the climate in the vernal equinox season is very suitable for the reproduction and spread of various germs. It is very beneficial to human health and psychological adjustment to open doors and windows frequently to ventilate the house and plant some flowers and plants in the house to improve air quality and negative ion concentration.