There is the Big Dipper, the Southern Dipper and the Polaris in the sky. Have you heard about invivo?

Stars day and night are named by human beings. Since there are the Big Dipper, Southern Dipper and Polaris, don't worry that human beings will forget to get a invivo.

But invivo seldom heard of it.

firstly, it is not as famous and useful as Polaris, and secondly, it is not in our north.

There are many stars named after their directions, and when you hear them, you will know that they refer to the stars in a certain direction in the sky. Since human beings have endowed the earth with all directions, it is not surprising that some stars are named after directions.

The earth is divided into the southern hemisphere and the northern hemisphere. The sky surrounding the earth is called the celestial sphere. The sky seen by people in the southern hemisphere is basically the southern hemisphere, while that seen by people in the northern hemisphere is basically the northern hemisphere.

China is in the northern hemisphere, so everyone is familiar with the northern celestial sphere.

it will be much better for us to understand the following explanation of the stars.

let's talk about the big dipper first.

The Big Dipper is the most famous astrology in China. In very early ancient times, people endowed this star combination with mysterious power and used it as a symbol of fortune telling.

These seven stars form the shape of a spoon near the North Celestial Pole. The names from the spoon mouth are Tian Shu (greedy wolf), Tianxuan (giant gate), Tianji (Lu Cun), Tianquan (Wen Qu), Yuheng (Lian Zhen), Kaiyang (Wu Qu) and Yaoguang (Pojun).

From these names, we can see that these seven stars are endowed with different jurisdictions and representative meanings. For example, Tianquanxing, also known as Wenquxing, is a symbol of ancient learning hegemony, and the person who won the top prize is Wenquxing.

These stars are in charge of all walks of life, and each has its own meaning, which is very complicated. They are artificially endowed with personalized symbols.

In ancient times, people used the Big Dipper to determine the seasons, didn't they? Bucket handle refers to the winter, and the world is spring; Bucket handle refers to the south, and the world is summer; Bucket handle refers to the west, and the world is autumn; Bucket handle refers to the north, the world is winter? The record.

However, this world is a bit far-fetched, because only the northern hemisphere can see the Big Dipper, and the season can only refer to the middle and low latitudes in the north latitude, so the southern hemisphere is not suitable. So the ancients? The world? The horizon is relatively small.

actually, these stars are ordinary stars.

Stars are far away from us because of their own light. Although they are moving, they seem to move slowly relative to our distance, and have hardly changed for thousands of years, so they are called stars.

Strictly speaking, the Big Dipper actually has eight stars, and Kaiyang has an auxiliary star called Ursa Major 8, which is relatively faint and used by the army to test the eyesight of soldiers in ancient times.

In fact, the Big Dipper is also changing. The middle five stars move in one direction, while Tian Shu and Yaoguang move in the opposite direction. Therefore, the Big Dipper was not like this tens of thousands of years ago and after.

speaking of Beidou, let's talk about Nandou.

In fact, Nandou Star is also a star that we can see in the northern hemisphere, but from the perspective of people in the northern hemisphere, Beidou is in the north and Nandou is in the south.

Nandou is not a seven-star, but a six-star, which was also attached great importance in ancient China, and it believed and worshipped like Sun Moon and Beidou.

the southern dipper is located in Sagittarius in the southern sky, and it is the brightest main star.

The names of the six stars in Nandou are Tianfu Star, Tianliang Star, Celestial Star, Tiantong Star, Celestial Star and Seven Killing Stars. In ancient China, there were? Beidou is the master of death, and Nandou is the master of life? The statement.

In Taoist culture, the Six Star Kings in Nandou are heavenly officials who manage all creatures in the world, such as people, demons, spirits, gods, immortals, etc. Their respective duties are: the first Tianfu Palace, serving as the star monarch; The next day, Xianggong was the secretary of Lu Xing; On the third day, Liang Gong was the star king of life extension; On the fourth day, I was in the same palace for the benefit of the star king; The fifth Tian Shu Palace is the Star King of Due; On the sixth day, the celestial palace is the star king.

No matter whether Beidou fights south, it is a star that is dozens or even hundreds of light years away from us, and it has nothing to do with our life and death. It is meaningless to study these things, but it takes many people's lives.

Ironically, some people are still wasting their time on it, even harming the world, which is disgusting.

now let's talk about Polaris.

the so-called north celestial pole is above the north pole.

This is because the earth has an axis of rotation, and the earth rotates around this axis. People see the stars in the sky as if they revolve around the earth.

This axis of rotation is virtual, and there is no real axis passing through the earth. But the earth is really turning like this, and the sky around the earth is called the celestial sphere.

Actually, the celestial sphere is not turning, but the earth is turning, which relatively looks like the celestial sphere is turning.

and there is one place in the celestial sphere that basically won't rotate, that is, the point where the virtual axis points to the sky. And the star at that point, people call it Polaris.

The star there now is called Gou Chenyi, which is about four times the mass of the sun, 434 light years away from us, with a visual magnitude of about second class, ranking 51st among the brightest stars in the sky.

You can find the North Star through the Big Dipper. The second celestial star on the edge of the Big Dipper is connected by Tian Shu Star, and there is a bright star about five times the interval between the two stars, that is, the North Star Gouchen Yi.

But Polaris is not a fixed star, but will take turns to be on duty.

This is because when the earth rotates, although the earth's axis basically does not move, it will also swing slightly when the top rotates at high speed, just like when we play with the top. This is called precession of the earth's axis.

The causes of the precession of the earth are very complicated, which may be related to the angle between the yellow equator of the earth's revolution and rotation, the gravitational tide of the earth and the moon, the angle between the white road of the moon's revolution and the equator, and the shape of the earth. We won't discuss it today, just know that there is such a precession.

how big is this precession? It is estimated that there is a deflection of 5.29 "a year, so that the imaginary axis of the north and south poles of the earth draws a circle in the sky, and a perfect circle is drawn in about 25,8 years.

In this way, the sky pointed by the so-called North Pole and South Pole Axis is not a specific star, but all the stars along the circle of the Earth's axis have the right to be the Polaris. Whichever planet the Earth's axis faces, which star becomes the Polaris.

therefore, Polaris will change when the tide turns.

However, the duty of Polaris is not as fast as that of our people changing presidents, but it comes every few thousand years.

This determines that Polaris neither refers to a single star nor is it aimed at the North Pole exactly, but is almost near the sky area pointed by the earth's axis, and whoever can see the star closest will serve as Polaris.

Gou Chen, the duty Polaris started 12 years ago, and in another 4 years, this position will be ceded? Hook Chen Si? After that, this star will not shine, and the apparent magnitude is only 4.28, which is less than one-eighth of the brightness of Polaris now.

By the year 135, Vega, which we are familiar with, will be the Polaris, and in 258, today's hook Chen will make a comeback.

since the earth's axis points to the celestial region and there is a north celestial pole, there should also be a south celestial pole. How can there be no invivo?

invivo is over the South Pole, which can only be seen in the southern hemisphere.

China belongs to the residents of the northern hemisphere, and all the celestial regions we see are in the northern hemisphere, so we don't care much about the southern celestial sphere.

We can see a little more stars in the southern hemisphere in Hainan Island. For example, the large and small Magellanic Clouds are basically invisible in our northern hemisphere, and Hainan Island can be seen at the edge of the southern skyline.

The six stars in Nandou mentioned above are not the stars in the southern sky, but only the stars in the southern end of the northern sky.

Therefore, the southern hemisphere is the starry sky seen by residents in the southern hemisphere of the earth.

There are fewer countries in the southern hemisphere. Australia and Brazil are the largest countries in the southern hemisphere, as well as some countries in South America and Oceania.

There are about 6, stars in the night sky visible to the naked eye. These planets are distributed on the all-sky sphere, while our earth has the southern hemisphere and the northern hemisphere, so everyone can see about half of the stars, about 3,.

invivo is much darker than Polaris, so it's hard to see.

The celestial region pointed by the axis of the Antarctic is the south celestial pole, and the star in the sky pointed by the dotted line of the axis of the Antarctic is invivo.

the star that is now in power in invivo is called the south pole? Star, this star is about 28 light years away from us, and its apparent magnitude is about 5.6.

The larger the magnitude is, the darker the stars are. The limit for human beings to see the stars with the naked eye is 6, so this South Pole? The brightness of the stars is weak to the limit of human eyes, and they can only be seen in front of them if the weather is very good and there is no light pollution, so they are not valued by people.

compared with the Polaris seen in the northern hemisphere, the brightness of invivo is more than 2 times different.

However, in the northern hemisphere, people often call a very bright star invivo, which is the star with the second highest visual brightness in the night sky-Laonian.

The brightest star in the whole day is Sirius, with an apparent magnitude of -1.47, and the apparent magnitude of Laonian reaches -.72.

Only people in the northern hemisphere near the south can see the Old Star, which is below Sirius in the southern sky and close to the horizon.

In the southern hemisphere, it is difficult for people to see Sirius, so Laonian is the first bright star in the sky. However, this star is far from the south celestial pole, not invivo.

This is the secret of Beidou's southern fight against the stars in the North Pole and South Pole. Thank you for reading and welcome to discuss.

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