Why is it the coldest during the Great Cold , and not during the winter solstice

Because of the frequent southward cold wave during the "Great Cold", it is the coldest period of the year in most parts of China, with strong winds, low temperatures, and snow on the ground, showing a severe cold scene of ice and snow, and cold and frozen.

The so-called big cold, one is relative to the small cold, and the other is the extreme cold when the weather is cold, so it is called "big", as recorded in the "Time and Examination of the Heavens": "The reverse pole of the cold is called the big cold." There is a proverb as evidence: "A small cold is not as good as a big cold, and the weather becomes warmer after the big cold." ”

Winter solstice: Winter solstice, is a very important solar term in the Chinese lunar calendar, but also a traditional festival of the Chinese nation, the winter solstice is commonly known as the "winter festival", "long solstice festival", "sub-year", etc., as early as more than 2,500 years ago in the Spring and Autumn Period, China has used Tugui to observe the sun, determined the winter solstice, it is the earliest of the 24 solar terms, the time is between December 21 and 23 of the solar calendar every year, this day is the shortest day and the longest night in the northern hemisphere; Most of northern China still has the custom of eating dumplings and eating dumplings in the south on this day, and the proverb: when the winter solstice arrives, eat dumplings.

Modern astronomical science has determined that on the winter solstice, the sun directly hits the Tropic of Capricorn (also known as the winter solstice line), and the sunlight is the most inclined to the northern hemisphere, and the northern hemisphere has the shortest day and the longest night. After the winter solstice, the sun slowly shifts towards the Tropic of Capricorn.

Great Cold: Great Chill is one of the 24 solar terms. Around January 20 every year, when the sun reaches 300° of ecliptic longitude, it is a great cold.

Seventy-two Candidate Explanations of the Lunar Order": "In the middle of December, the solution is seen before (Xiaohan). "Time Passing Examination: Heavenly Time" quotes "Three Rites and Righteous Sects":

The big cold is the middle, and the upper form is in the small cold, so it is called the big ......The reverse of the cold is called the great cold. "At this time, the cold wave is frequent in the south, and it is the coldest period of the year in most parts of China, with strong winds, low temperatures, and snow on the ground, showing a severe cold scene of ice and snow, and freezing of the ground. During this period, the railway, post and telecommunications, petroleum, and maritime transport departments should pay special attention to taking measures to prevent severe weather such as strong winds and heavy snowfall as soon as possible.

In agriculture, it is necessary to strengthen the protection of livestock and overwintering crops from cold and frost.

Although from the winter solstice, the point of direct sunlight moves from the Tropic of Cancer towards the equator. But the weather in the Northern Hemisphere has not yet turned warmer. Because at this time, the cold air "accumulated" in the north continued to move south.

This extra bit of sunlight isn't enough to contend with. So the coldest time of the year is the Great Cold.

It's similar to how the hottest time of the day isn't noon. It was past 12 noon, although the sun was a little off. But the heat is still increasing. So the hottest part of the day is usually around 2 p.m.

The Northern Hemisphere receives the shortest amount of sunshine during the winter solstice, when the Earth receives the least amount of heat throughout the year. But not the coldest time. To give you a figurative example, wearing a coat outside the house in winter will not immediately feel cold, and only after a while, will you feel cold.

The general principle is that there is a delayed consumption of heat. When it reaches about the great cold, the temperature reaches its lowest point.

To put it simply, this is a summary of the experience accumulated by the ancient ancestors of our country for thousands of years, and the truth is as stated upstairs.

The coldest ranking, the small cold, the winter solstice, the big cold, the beginning of spring.

Is the big cold the coldest solar term of the year? Why?

Is the Great Chill the Coldest Solar Term of the Year: In terms of the season, the Great Chilli is the coldest solar term. However, considering the large span of Jingwei in China, there is no small severe cold in the Great Cold Solar Term in North China, and the coldest in the vast majority of southern regions is the Great Cold Solar Term.

In terms of solar terms, the Great Cold is the coldest solar term.

However, considering the large span of Jingwei in China, there is no small severe cold in the Great Cold Solar Term in North China, and the coldest in the vast majority of regions in the South is the Great Cold Solar Term.

After the winter solstice solar term, the irradiation point of the sun will slowly move northward, but in the following period of time, the solar irradiation point is still in the southern hemisphere from beginning to end, and the heat generated by the northern hemisphere is in the situation of loss from beginning to end, and the heat absorbed in the daytime is lower than the heat released at night, so after the winter solstice solar term, the temperature in the northern hemisphere is still decreasing, and the temperature drops to the minimum during the period of the big cold solar term, and the big cold is the coldest solar term of the year.

Because of China's vast territory and large north-south span, there is a very big difference in climate between the north and the south. According to the climate records in China, there is no small severe cold in the big cold solar term in North China; However, for most areas in the southern region, it is the coldest in the process of 49, so the Great Cold Solar Term is colder than the Small Cold Solar Term.

The sunshine standard of the big cold refers to the sunshine time of the house, and the state stipulates that the sunshine time of the big cold day is the standard. The standard day of sunshine is the day of the Great Cold Solar Term, and the sunshine calculation unit is each house (household as an enterprise), and the sunshine time should be two hours.

Because the spacing between buildings in large cities is getting higher and higher, the blocked engineering buildings are generally blocked by several engineering buildings, so the period of sunshine is usually not continuous. Therefore, in order to ensure the sunshine time, the state stipulates that on the day of the great cold, the interval between the high-rise residential residence and the various residences behind it must reach the reasonable sunshine time of the blocked residential day for no less than 2 hours; In the new project of the old urban redevelopment, the newly created residential buildings must reach a reasonable sunshine time of not less than 1 hour on a cold day, and the distance between the high-rise residential buildings and the various residential buildings behind them shall not be less than 30 meters.

At the same time, in order to ensure the quality of sunshine, the residential community design standard establishes a reasonable sunshine time zone to match the cold day is 8 o'clock to 16 o'clock, and in a house some windows are likely to not meet the sunshine standard, but if a house has a window to reach the cold day for 2 hours, the house will meet the sunshine standard.

It's not the coldest weather of the year. The coldest solar term of the year is Xiaohan. Because with the change of seasons.

In the time of the great cold. The sun gradually moves southward. The north will continue to cool down.

By the time Xiaohan arrived, the sun had moved to the southernmost edge. This means that the temperature has reached its coldest in the north.

The Great Cold is the coldest solar term of the year, because when it comes to the Great Cold, it belongs to the four or nine days, which belongs to the relatively cold weather, so it is said that the Great Cold is the coldest solar term of the year.

Yes, of course. Because China's latitude and longitude span is relatively large, the coldest time in the southern region is the Great Cold Solar Term.

Of course, it is due to the fact that my latitude and longitude are more aggressive, and the cold time in the southern region is a big cold solar term.

The weather is bitterly cold, and the coldest period is coming

Dahan, like Xiaohan, is a solar term that indicates the degree of coldness of the weather, and Dahan means that the weather is cold to the extreme. The Great Cold Solar Term is in a hidden place.

Three. During the September and April 9 periods, the cold waves at this time are frequent in the south, and it is the coldest time of the year.

Although the winter solstice solar term is the time when the solar height in the northern hemisphere is the lowest, the coldest time of the year is the Xiaohan and Dahan solar terms after the winter solstice, especially the Dahan solar term.

This is because after the winter solstice, the direct point of sunlight will gradually move northward, but in the following period of time, the direct point of the sun is always in the southern hemisphere, the heat of the northern hemisphere is always in a state of loss, and the heat absorbed during the day is still less than the heat released at night, so after the winter solstice, the temperature in the northern hemisphere continues to decrease, and the temperature drops to the lowest during the cold solar term.

Three waits for the big cold

In ancient China, the Great Cold was divided into three phases: "one is chicken milk; Second, the migratory birds are severely ill; Three waits for Mizusawa to have a strong belly. It means that in the cold season, spring germinates and chicks can be hatched.

Five days later, eagles, falcons, and other distant birds became more fierce and swift, hovering in the air in search of food; After another five days, the ice in the water area was frozen until the water**, and the top and bottom were frozen through, and it was extremely cold.

The above content reference: Encyclopedia - Dahan.

The Great Han is one of the 24 solar terms, and it is a solar term immediately after the Little Han. As we all know, the weather gets cold quickly after a small cold. So, is the big cold the coldest time? Why is the big cold the coldest?

Is the big cold the coldest time?

Theoretically yes, but in practice it is not.

Xiaohan refers to the half month from January 6 (or 5) to 20 (or 19) of the solar calendar every year. Han means cold, and small cold indicates the degree of coldness.

In ancient times, the interpretation of Xiaohan was: "The cold air accumulates for a long time and is cold, and the small one is not extreme", because it has not yet reached the coldest time in winter, so the solar term is Xiaohan. The phenological phenomenon corresponding to Xiaohan is "the north of the wild goose, the first nest of the magpie, the pheasant chirping", at this time the winter is coming to an end, the wild goose bird flies to the north, everything begins to move, and at this time most of the crops have been harvested, every household is ready to do New Year's goods, to welcome the arrival of the new year.

A small cold is better than a big cold.

Characteristics of the cold season.

It is reported that the "Great Cold" is the last of the 24 solar terms, when the cold wave moves south frequently, and it is a cold period of the year in most parts of China. However, meteorological experts said that in the winter of the Year of the Dragon, the cold air that affected China in the early stage was stronger, the temperature was low, and it was significantly colder than the same period in previous years.

Characteristics of a cold climate.

During the cold season, the atmospheric circulation is relatively stable, and the circulation adjustment period is about 20 days. When this kind of circulation is adjusted, there is often a wide range of rain and snow and strong winds to cool down. When the west of 80 degrees east longitude is the long-wave ridge and East Asia is the coastal trough, China will have persistent low temperatures under the influence of the northwesterly wind and the continuous replenishment of cold air.

Like Xiaohan, Dahan is also a solar term that indicates the degree of coldness of the weather. Although modern meteorological observation records show that in some parts of China, the big cold is not as good as the small cold, but in some years and a few places along the coast, the annual minimum temperature will still appear in the big cold solar term. Therefore, we should continue to do a good job of protecting crops from the cold, and special attention should be paid to protecting livestock for the winter.

The coldest explanation of the Great Chill

The Great Chill is one of the 24 solar terms. Around January 20 every year, when the sun reaches 300° of ecliptic longitude, it is a great cold. "Seventy-two Candidate Explanations of the Lunar Order":

In mid-December, Xie Jianqian (Xiaohan). "Giving Time to Test the Heavenly Time" quotes "Three Rites and Yizong": The big cold is the middle, and the upper form is in the small cold, so it is called the reverse pole of the big cold, so it is called the big cold.

At this time, cold waves are very frequent in the south.

The Great Cold is the coldest time of the year in most parts of China, and at this time it is not only windy, low-temperature, and snow-freezing, but also a severe cold that is freezing and snowy. During this period, the railway, post and telecommunications, petroleum, and maritime transport departments should pay special attention to and take early measures to prevent severe weather such as strong winds and heavy snowfall. At the same time, in agriculture, it is necessary to strengthen the protection of livestock and wintering crops from cold and frost.

As the saying goes: flowers and trees are in season, and birds are singing to report the agricultural time. Flowers, trees, birds, beasts, and birds all move according to the seasons, so their actions can be said to be very regular, and they are regarded as important symbols to distinguish the seasonal solar terms.

In ancient China, the great cold was divided into three phases: first, chicken milk; Second, the migratory birds are severely ill; Three waits for Mizusawa to have a strong belly. That is to say, when it comes to the big cold solar term, the chicks can be hatched.

At this time, birds such as eagles and falcons are in a state of extremely strong predation ability, and they are noisy in the air looking for food everywhere to replenish their body's energy to resist the cold;

During the last 5 days of the year, the ice in the water is the strongest and thickest, and children can skate on the river to their heart's content (the average daily temperature can only be carried out when the weather is below -5 for many consecutive days, and this activity generally occurs in the area north of the Yellow River). In addition, the flower trade wind weather that appeared in the Great Cold is one for Ruixiang, two for orchids, and three for mountain alum (born in the Jiangnan area). This is also an important indicator that can be used as a judgment of the great cold.

In the cold season, the average temperature in most parts of southern Zhaoxiao in China is mostly 6 to 8, nearly 1 higher than that of Xiaohan. The proverb that the small cold and the big cold are cold shows that the big cold solar term is also the cold solar term of the year.

The winter solstice is the length of the night and the shortness of the day.

On the day of the winter solstice, although the sun is low and the days are short, in terms of meteorology, the temperature of the winter solstice is not the lowest. In fact, it is usually not very cold before the winter solstice due to the "accumulated heat" on the surface, and the real cold is after the winter solstice.

Due to the great disparity in climate across our country, this climatic winter is obviously late for most parts of our country. When it comes to the winter solstice, the good rock trap marks that it is about to enter the cold season, and the folk began to "count nine" to calculate the cold weather.