Which solar term reflects the height of the sun?
1, vernal equinox
The vernal equinox is one of the 24 solar terms and the fourth solar term in spring. On this day, the sun shines directly on the equator, and the length of day and night is equal all over the world.
"Equinox" has two meanings. One is "season sharing". Traditionally, spring is between beginning of spring and Changchun, and the vernal equinox is in the middle of the two solar terms, which just divides spring equally. Another meaning is "day and night are equal", and the weather is warm and sunny.
On the vernal equinox, there are many traditional customs among the people, such as laying eggs vertically, eating spring vegetables and sticking birds' mouths. At the same time, the spring equinox is also an important node of climate change. Since the vernal equinox, the sunshine time in the northern hemisphere has gradually increased and the climate has gradually warmed.
The vernal equinox has obvious climatic characteristics. After the vernal equinox, China has entered a beautiful spring except the Qinghai-Tibet Plateau, Northeast China, Northwest China and North China. After the vernal equinox, the weather gets warmer, which is a good time to enjoy flowers.
2. Summer solstice
The summer solstice is the tenth of the 24 solar terms, and usually comes on June 2 1 or 22 of the Gregorian calendar. On this day, the position where the sun shines directly on the ground reaches the northernmost point of the year, almost directly on the Tropic of Cancer, making the sunshine time in the northern hemisphere the longest all year round. Therefore, the summer solstice is the longest day and the shortest night in the northern hemisphere.
On the solstice of summer, people have various traditional customs. For example, in ancient China, there were "three phases" from summer solstice, that is, antlers dissolved, cicadas began to sing, and Pinellia ternata was born. People are also used to eating some cool foods, such as sour plum soup and herbal tea, from summer to around.
3.autumnal equinox
The autumnal equinox is the sixteenth solar term among the twenty-four solar terms and the fourth solar term in autumn. On this day, the sun shines almost directly on the equator of the earth, and the length of day and night is equal all over the world.
On the autumnal equinox, farmers have a holiday according to the custom. Every family should eat jiaozi, cook a dozen or twenty or thirty unwrapped jiaozi, and put them on the outdoor ridge beside the field with thin bamboo forks, which is called sticking sparrows' mouths so as not to destroy crops. In addition, the autumnal equinox used to be the traditional "Moon Festival", and the Mid-Autumn Festival evolved from the "Autumn Moon Festival".
4. Winter solstice
The winter solstice is the 22nd solar term in the "twenty-four solar terms", and it is celebrated every year on the Gregorian calendar 65438+February 265438+1October-23rd. The solstice in winter is the extreme point of direct sunlight spreading to the south. On the solstice in winter, the sun shines directly on the Tropic of Capricorn, which is the most inclined to the northern hemisphere and the solar altitude angle is the smallest. In all parts of the northern hemisphere, the days are the shortest and the nights are the longest.
The custom of winter solstice varies in content or details due to different regions. In southern China, there are customs of offering sacrifices to ancestors and enjoying the winter solstice. In northern China, it is a custom to eat jiaozi from winter to Sunday every year.