Does the vernal equinox mean the beginning of spring?

Does the vernal equinox mean the beginning of spring?

Does the vernal equinox mean the beginning of spring? The first vernal equinox refers to the equal division of day and night, each of which is 12 hour; Second, in ancient times, it was spring from beginning of spring to long summer, and the vernal equinox happened to be in the three months of spring, and spring was equally divided. Do you understand the meaning of vernal equinox?

Does the vernal equinox mean the beginning of spring? 1 The vernal equinox is one of the 24 solar terms and the midpoint of 90 days in spring. The Gregorian calendar date is about March 2 1 day (20th to 22nd) every year. In ancient times, the day when the sun reached the 0 (vernal equinox) longitude of the Yellow River was also called "Japan-China", "Day and Night" and "Midspring Moon".

The spring equinox is not the beginning of spring, but the beginning of spring.

1, astronomical phenomena

In terms of time period, it means that the sun is located in the interval from 0 to 15, which is about March 20 to April 4 of the Gregorian calendar. But it usually refers to the day (or moment) when the sun hits the equator directly. Simply put, the sun shines directly on the equator, and the day is as long as the night, which is the equinox of day and night. The sun began to move towards the Tropic of Cancer.

2. Earth phenomenon

At the vernal equinox, the direct point of the sun is on the equator, and then the direct point of the sun continues to move northward, so the vernal equinox is also called the ascending equinox.

At the vernal equinox, except near the pole, the world's day and night are almost the same length. After the vernal equinox, the days in the northern hemisphere are getting longer and shorter, and the nights in the southern hemisphere are getting shorter and shorter.

At the vernal equinox, there are no extreme days and nights in the world. After the vernal equinox, it began to be extremely daytime near the North Pole, and its scope gradually expanded. Near the Antarctic, the extreme day ends and the extreme night begins, and the scope gradually expands.

The sunshine at the vernal equinox, when the length of day and night is the same all over the world.

Does the vernal equinox mean the beginning of spring? The vernal equinox is the fourth of the 24 solar terms. It is neither the beginning nor the end of spring. It belongs to the midpoint of the spring, which just bisects the spring. From beginning of spring to Changchun, the 90-day vernal equinox is right in the middle of these two solar terms. The vernal equinox is also an important solar term, which not only has astronomical significance, but also has obvious climatic characteristics. At the vernal equinox, the climate began to get warmer and the rain gradually increased, which was beneficial for migrant workers to cultivate and fertilize. Overwintering crops in most areas of China began to grow in spring, and early rice was also sown.

In fact, the vernal equinox has two meanings. The first layer means that after the operation, the sun begins to shine directly on the equator, so day and night are equal. However, after the vernal equinox, Zhi Zhi began to move northward, and the corresponding night time would be shortened gradually, and the night life in the northern hemisphere would be shortened and the night life in the southern hemisphere would be lengthened. The vernal equinox has another meaning, that is, the seasons begin to divide equally, which belongs to the middle point of spring, so it is called the middle point.

The custom of spring breeze

1, vertical egg

Every spring equinox, tens of millions of people all over the world are doing "vertical egg" experiments. Choose a smooth, fresh egg that has just been born for four or five days, gently stand it up and put it on the table. Although there are many losers, there are also many winners. The vernal equinox has become the best time for vertical egg games, so there is a saying that when the vernal equinox arrives, the eggs will be beautiful.

Step 2 stick the sparrow's mouth

According to custom, farmers have a holiday on the vernal equinox. Every family should eat glutinous rice balls. Ten or more glutinous rice balls that don't contain hearts should be cooked and put on the outdoor field with a thin bamboo fork, which is called sticking the sparrow's mouth, so as not to destroy crops.

3. Spring Festival

The vernal equinox is also the beginning of the Spring Festival. Spring Festival, that is, the beginning of sweeping graves to worship ancestors, is also called Spring Festival. Before sweeping the grave, a grand ancestor worship ceremony should be held in the ancestral hall, pigs and sheep should be slaughtered, drummers should be invited to play, and the ritual students should read the eulogy and quote three praises. At the beginning of the spring equinox, the graves of ancestors and distant ancestors are opened first, and the whole family and village will be dispatched. The scale is very large, and the team often reaches hundreds or even thousands. After the tomb of Kaiji Zuzu was swept, the ancestral graves of each room were swept, and finally the private graves of each family were swept.

Does vernal equinox mean spring? Three vernal equinox solar terms

1, which means "vernal equinox and autumnal equinox, equally divided day and night". At the vernal equinox, the direct point of the sun is on the equator, and the seasons in the northern and southern hemispheres are opposite. The northern hemisphere is the vernal equinox and the southern hemisphere is the autumnal equinox. Since then, the direct point of the sun has continued to move northward, so the vernal equinox is also called the rising equinox.

At the vernal equinox, theoretically, the world is as long as day and night (see the dawn). After the vernal equinox, the days in the northern hemisphere are long and the nights are short, while the days in the southern hemisphere are short and the nights are long.

At the vernal equinox, there are no extreme days and nights in the world. After the vernal equinox, it began to be extremely daytime near the North Pole, and its scope gradually expanded. Near the Antarctic, the extreme day ends and the extreme night begins, and the scope gradually expands.

2. It refers to "season sharing". If the period from the beginning of spring to the long summer is regarded as spring, then the vernal equinox is the midpoint of spring, which just divides spring equally. It is exactly ninety days from beginning of spring to Changchun, and the vernal equinox is divided into two, hence the name vernal equinox.

Does the vernal equinox mean that spring is coming?

No. Astronomically speaking, the beginning of spring is the beginning of spring; Climatically, the standard of entering spring is different in every place, not necessarily at the vernal equinox.

Vernal equinox phenology:

Here comes the mysterious bird: Ye Yan, the mysterious bird, coaxed, "The vernal equinox has come and the autumn equinox has gone."

Lei Nai voiced: Yin and Yang are thin, which is thunder. At this time, the four yang are gradually flourishing, and there is still yin, so it is thin for sound; Yes, the rhyme club said, "It is difficult to exhale like gas." Shu Zhu said: "hair, still out."

Initial electricity: electricity, sunshine also; The four yang are flourishing, and the gas is exhausted and the light is born. Therefore, "Li Jie" said: "All voices are positive; Light is also yang.

"Yi" said: "Thunder and lightning are combined into one chapter." "Biography of the Ram" also said: "Electricity, Lei Guang." Yes, Xu said, "Thunder is the sun, and electricity is cloudy." Not exactly. It is obvious that there is electricity without thunder in midsummer.

In ancient China, the vernal equinox was divided into three stages: "One stage is the arrival of mysterious birds; Second, wait for Lei Nai to make a sound; Third, wait for electricity. " In other words, after the vernal equinox, swallows will fly from the south, and when it rains, the sky will thunder and lightning. The vernal equinox is recorded in the ancient calendar of China: "Three days before the vernal equinox, the sun entered the equator."

What are the climatic characteristics of the vernal equinox?

Vernal equinox climate

aeolian sand

During the vernal equinox, the northwest, the northern part of North China and most of the northeast are still in the transitional stage from winter to spring, with sunny and windy days, and it is warm and cold at first sight. According to the statistics of dusty weather in recent years, April is the most frequent, followed by March, and the vernal equinox is 15 days, that is, from the end of March to the beginning of April. In these areas, dust blown by strong winds and floating dust from high altitude, especially the air pollution caused by dust storms, have always been the focus of attention and become a hot topic for some time.

Low temperature and humid weather

At the vernal equinox, cold air constantly invades the south of China, and there will be cold weather in spring with low temperature. At this time, the continuous rain will have a great impact on crops.

If the average temperature is lower than 10 ~ 12℃ for more than 5-7 days, it may cause serious rice seedling rot. Because rice and cotton are both thermophilic crops, when the temperature is above 10 ~ 12 and the minimum temperature in sunny days is above 5℃, it is beneficial to all seedlings. Conversely, if there is low temperature and rainy weather, you can imagine.

First frost is the product of cold wave and strong cold air in spring. In the case of warmer climate, cold waves are relatively rare, but we should not be careless.

Climatic characteristics of vernal equinox

Abnormal cold weather in early spring

In early spring, the temperature rises quickly, and then it stays low for a while. This weather phenomenon is called late spring cold. In the south, the main influence of late spring cold is the rotten seedlings of early rice. In the north, it will affect the growth of peanuts, vegetables and cotton, and seriously cause the phenomenon of wheat seedling death. A very serious late spring cold occurred in the middle and lower reaches of the Yangtze River, just at the vernal equinox, that is, from late March to early April of 1976. The loss of grain seeds in Hunan, Jiangxi and Hubei provinces alone reached 700-800 million Jin.

spring drought

In the north, especially in the northwest and north China, there is a saying that "spring drought lasts for ten years and nine months" and "spring rain is as expensive as oil". When there is little rain and snow in winter, winter wheat is in the wintering period and is not very sensitive to water shortage. After March, the soil thawed and the wheat turned green; In spring, crops are sown from south to north. If the precipitation continues to be less at this time, the drought will be clearly reflected, and the situation of seedlings can be imagined.

Pre-flood season in southern China

There are two rainfall concentration periods in South China, one is the first flood season from April to June, and the other is the second flood season formed by typhoon rainfall from July to September. The first flood season begins in early April and reaches its peak in mid-May, with an average of 20 rainstorms per year, with the most in June, accounting for more than half of the total rainstorms. It lasts for a long time and the rain is fierce. Because the "vernal equinox" only touches the beginning of the flood season, I won't go into details here.