The length of day and night on the day of the beginning of spring is closest to what solar term

Twenty-four solar terms.

The length of day and night is based on the position of the Sun on the ecliptic, which is the Earth's orbit around the Sun.

The 24 solar terms reflect the natural phenomena and agricultural seasonal characteristics of a certain region in China (represented by the middle and lower reaches of the Yellow River). Namely: the beginning of spring, rain, stunning, vernal equinox, Qingming, Guyu, Lixia, Xiaoman.

Miscanthus seeds, summer solstice, and small summer.

The great heat, the beginning of autumn, the summer heat, and the white dew.

Autumn equinox, cold dew, frost, beginning of winter, light snow, heavy snow, small cold, big cold.

Vernal equinox March 20-22 (generally in 3-21) direct to the equator, day and night are of equal length; On June 21-22, the summer solstice hits the Tropic of Cancer (6-21).

Longer days and shorter nights (Northern Hemisphere); Autumnal equinox: September 23-24 (9-23) directly at the equator, day and night are of equal length; Winter solstice: December 21-23 (12-22) Straight to the Tropic of Capricorn, short days and long nights (Northern Hemisphere).

The sun is regarded as departing from the vernal equinox (zero degrees of ecliptic longitude, at which point the sun is perpendicular to the equator), and every 15 degrees is a solar term; It runs for a week and returns to the vernal equinox, which is a return year, which is 360 degrees, so it is divided into 24 solar terms.

When the sunlight shines directly on the Tropic of Capricorn, this day is called the winter solstice, which is December 22, the days are short and the nights are long in the Northern Hemisphere, and there is a polar night phenomenon in the areas within the Arctic Circle; When the sun's rays shine directly on the Tropic of Capricorn, the day is called the summer solstice.

On June 22, the days were long and the nights were short in the Northern Hemisphere, and there was a polar day phenomenon in the Arctic Circle; When the sun's rays first shine directly on the equator, this day is called the vernal equinox, which is March 21, and the global equinox of day and night; The second direct shot on the equator is the day of the autumnal equinox, which is September 23, and the global equinox of day and night.

Children's Enlightenment Twenty-four solar terms and vernal equinox On this day, day and night are of equal length.

As we all know, everyone knows, there are throughout the yearTwenty-four solar terms。The beginning of summer is the longest day of the year. Let's talk about it, what is the significance of this day?

What do you need to prepare for and prevent?

1. The beginning of summer is the longest daylight day of the year. <>

The beginning of summer is the 24th solar term.

It is also the earliest solar term that established the time. It is a more traditional festival in our country. The daylight hours are longer, and the weather is getting hotter and hotter from day to day. As the temperature gradually increases, the crops in the field can better photosynthesize.

It is beneficial for the growth of plants.

Second, the weather temperature gradually increases after the beginning of summer, pay attention to heat prevention.

After the beginning of summer, the temperature becomes warmer and hotter. It's very hot, the sun is very harsh, and the air becomes stuffy. In our daily life, we must do a good job of preventing heatstroke.

Drink plenty of water, go to bed early and wake up early, and have a regular schedule. Because the weather is hot and you are prone to spoilage. We must do a good job of hygiene and do not eat expired and long-lasting meals.

This can prevent the occurrence of gastrointestinal diseases. When you go out, you should wear sun protection, wear a sun umbrella, sun hat and sunglasses when driving.

Wait. It is also necessary to maintain a peaceful mind, so that the mind is calm and naturally cool. Don't lose your temper.

3. Relevant information. <>

The solar term is a specific festival in the Ganzhi calendar that indicates changes in the natural rhythm and establishes the "December Tsuki" (moon order). The twenty-four solar terms are: the beginning of spring, rain, stunning, vernal equinox, Qingming, Guyu, Lixia, and Xiaoman.

Miscanthus seeds, summer solstice, and small summer.

The great heat, the beginning of autumn, the summer heat, and the white dew.

Autumn equinox, cold dew, frost, beginning of winter, light snow, heavy snow, winter solstice, small cold, big cold.

If you agree with me, please give me a like or follow me, thank you very much. In addition, you feel that the longest day of the year is in the 24th solar term.

On the summer solstice, the day has the longest daylight hours and the shortest night hours, and after the second day, the daytime hours will become shorter and the night hours will become longer.

The summer solstice is June 21, 2021, when the sun shines directly on the Tropic of Capricorn, with the longest daylight and the shortest night.

It should be the summer solstice, and the day of the summer solstice must be the longest day of the year, usually between June 20th and 22nd.

This day is called the summer solstice, and on this day the sun will shine directly on the Tropic of Capricorn, so the daylight hours on this day are relatively long, and the temperature is relatively high.

The short days and long nights are the winter solstice. The winter solstice falls around December 21 of the Gregorian calendar. On the day of the winter solstice, the sun almost directly hits the Tropic of Capricorn, and the northern hemisphere has the shortest days and the longest nights, and begins to enter the number nine cold days.

Astronomy defines this day as the beginning of winter in the Northern Hemisphere. After the winter solstice, the direct sunlight position gradually moves northward, and the days in the Northern Hemisphere gradually become longer.

The winter solstice is the twenty-four solar terms.

It is also the most important day of the year considered by the ancients to be the most important day of the year. The ancients used the sun to measure the shadow of the sun, and it was found very early that the shadow of the sun was the longest on this day, so it was easiest to correct it with this day as the beginning, so the ancients set the winter solstice sunset.

for the beginning of the year.

Zhou Dynasty. The first month of the first month refers to the day when the new moon is born, which is the beginning of the year. At that time, the Zhou Dynasty had adopted the month of the earthly branch, and the month of the winter solstice was the sub-month, that is, the November of the current lunar calendar.

1. The long days and short nights are summer.

2. The day of the summer solstice is the longest day and the shortest night, after the summer solstice, the days gradually become shorter, the night gradually becomes longer, and the autumn equinox is the same length as day and night, and the days are short and the nights are long after the autumn equinox, and the days are the shortest and the night is the longest on the day of the winter solstice, and then the days gradually become longer, the nights gradually become shorter, and the day and night are equal in length at the spring equinox, and they change to the summer solstice.

The solar terms related to the length of day and night are the spring equinox, summer solstice, autumn equinox, and winter solstice.

The sun travels back and forth between the Tropic of Cancer throughout the year, and when the spring and autumn equinoxes come, the sun shines almost directly at the equator, so the length of day and night is equally equinoxed around the world.

On the summer solstice, the sun shines almost straight over the Tropic of Capricorn, and the days and nights are short in the northern hemisphere, and the days are short and the nights are long in the southern hemisphere. And it was also the longest day and shortest night in the Northern Hemisphere.

On the winter solstice, the sun almost shines directly on the Tropic of Capricorn, the northern hemisphere has short days and long nights, and the southern hemisphere has long days and short nights, and this day is also the shortest day and longest night in the northern hemisphere. After the winter solstice, the days gradually become longer, the nights gradually become shorter, and when the spring equinox of the following year comes, it is the same length of day and night, and this change continues until the summer solstice.

The length of day and night is related to the solar terms

The Earth is a non-luminous and opaque sphere that rotates constantly, so at any one time, the Sun can only illuminate half of the Earth's surface, causing the alternation of day and night throughout the surface.

The dividing line between the day hemisphere and the night hemisphere is called the morning and dusk line, and the morning and dusk line divides the latitude line into two parts: the day arc and the night arc. The length of the day and night arcs determines the length of day and night in a place.

Since the earth's constant rotation produces seasonal changes, the change in the length of day and night is related to the seasonal solar terms.

1. The solar terms of equal length of day and night are the spring equinox and the autumn equinox.

2. Spring equinox, 24 solar terms.

One of them is the fourth solar term of spring. The vernal equinox is one of the more important solar terms, and it is astronomically significant: the equinox of day and night in the northern and southern hemispheres.

3. The meaning of the vernal equinox refers to the equal equinox of day and night, each of which is 12 hours; The second is that the spring equinox is in the three months of spring (beginning of spring to beginning of summer), and the spring is equally divided. The autumn equinox is the sixteenth of the 24 solar terms, and the time is generally September 22 and 24 of the Gregorian calendar every year. After the autumnal equinox, the direct point of the sun continues to move from the equator to the southern hemisphere, and the days and nights begin to be shorter and longer in the northern hemisphere, that is, the days begin to be shorter than the nights in a day. The Southern Hemisphere is the opposite.

Therefore, the autumn equinox is also called the descending equinox. And at the North and South Poles, on the day of the autumnal equinox, the sun is on the horizon all day.

Above. After that, as the direct point of the sun continues to move southward, a six-month polar night begins near the North Pole.

The scope gradually expands and then narrows; A six-month polar day begins near the South Pole.

The scope gradually expands and then narrows;

We often say that the plan of the year lies in the spring, and the plan of the day lies in the morning, and the 365 days of the year are divided into four seasons, spring, summer, autumn and winter, different seasons, the time of day and the length of time of night are different. We may often have this feeling, for example, it is also 7 o'clock in the morning, in the summer, the sky is already very bright at 7 o'clock in the morning, but in the winter, it is still dark at 7 o'clock in the morning, the same time, why is the darkness of the sky different? This brings us to geography, the geographical concept of the length of the day and the short of the night, the short of the day and the length of the night, and the equal division of day and night.

Among the 24 solar terms, there are four solar terms that are more special days, namely the spring equinox, summer solstice and autumn equinox, and winter solstice, and their time is about March 21, June 22, September 23, and December 22. The date of these four times is special because during these four days, the direct point of the sun is located at the equator, the Tropic of Cancer, and the equator of the Tropic of Capricorn. The meaning of the Tropic of Cancer and the Tropic of Cancer is that when the direct point of the sun is on the Tropic of Cancer, the direction of his future irradiation will only go south, and can not continue to move north, and the same is true of the Tropic of Capricorn.

Because our country is located in the northern hemisphere, when the sun shines directly on the Tropic of Capricorn, it is what we call the summer solstice. When the sun shines directly on the Northern Hemisphere, the days in the Northern Hemisphere will last longer than the night, and the day when the Sun reaches the Tropic of Cancer is the longest day and the shortest night of the yearIn the same way, when the sun shines directly on the Tropic of Capricorn, the Northern Hemisphere is at the time of the shortest day and the longest night, which is the winter solstice. When the direct point of the sun is located at the equator, the length of day and night in the northern and southern hemispheres is the same, and the direct point of the sun will fall on the equator twice in a year, so at the time of the spring and autumn equinoxes, these two time points are equal in length of day and night.

As the sun moves from the Tropic of Cancer toward the equator, the days get shorter and the nights get longer. As the sun shines directly on the point and moves from the Tropic of Cancer towards the equator, the days become longer and the nights become shorter.

The shortest solar term of the day is the winter solstice, in ancient times people also called the winter solstice "solstice", the shortest day, the long night, winter is officially coming. The longest solar term of the day is the summer solstice, when the days and nights are short, and the hot summer begins.

The shortest day of the 24 solar terms is the winter solstice (December 21 or 22); The longest day is on the summer solstice (June 21).

The longest day is the summer solstice, which will have 14 hours of daylight, and the shortest day is the winter solstice.

Children's Enlightenment Twenty-four solar terms and vernal equinox On this day, day and night are of equal length.

After the spring equinox and after the winter solstice, the days are long and the nights are short.

1. Vernal equinox. When the vernal equinox is slippery, the sun shines directly on the point.

At the equator, the direct point of the sun continues to move northward, so the vernal equinox is also called the ascending equinox. At the vernal equinox, theoretically, the global day and night are of equal length. After the vernal equinox, the days get longer and the nights get shorter in various parts of the northern hemisphere, and in the southern hemisphere.

The nights are getting longer and the days are getting shorter.

At the time of the vernal equinox, there is no extreme day and night around the world.

Phenomenon. After the vernal equinox, the polar day begins near the North Pole and becomes larger. The polar day near the South Pole ends, and the polar night begins, increasing in scope.

2. Winter solstice. On the winter solstice, the sun shines directly on the Tropic of Capricorn (also known as the winter solstice line), and the sunlight is the most inclined to the northern hemisphere, which has the shortest day and the longest night. After the winter solstice, the direct point of the sun slowly shifts towards the Tropic of Cancer.

Astronomically regards the winter solstice as the beginning of winter, which is obviously late for most parts of China. During the winter solstice, the average temperature in the northwest plateau is generally below 0, and the southern region.

It's only about 6 to 8. However, in the low-altitude valleys of the southwest, even in the coldest month of January, the average temperature is still above 10, which is really a year of autumn and no winter.

The spring equinox and the winter solstice are followed by longer days and shorter nights.

The winter solstice is the day with the shortest days and the longest nights of the year, after which the days become longer and the nights become shorter.

Then at the vernal equinox, the day is as long as the night, after which the day continues to grow longer than the night, and the night continues to get shorter.

Until the summer solstice, the days are the longest and the shortest.

The vernal equinox is the midpoint of the ninety days of spring. One of the 24 solar terms, the annual Gregorian calendar is about March 20, when the sun is located at 0° of yellow longitude (vernal equinox). On the day of the vernal equinox, the sun shines directly on the Earth's equator, and the seasons in the northern and southern hemispheres are reversed, with the northern hemisphere being the vernal equinox and the southern hemisphere being the autumnal equinox.

The winter solstice, commonly known as the "Winter Festival", "Long Solstice Festival" or "Ya Sui" and so on. The winter solstice is not only an important solar term among the 24 solar terms, but also a traditional festival for the Chinese nation.

From the winter solstice to the vernal equinox, the direct point of the sun moves from the Tropic of Cancer to the equator, and in the northern hemisphere, the winter solstice is the shortest day and the longest night. After the winter solstice, the days gradually become longer, reaching the equator at the direct point of the sun at the spring equinox, and reaching the Tropic of Cancer at the summer solstice.