There are the Big Dipper, the South Dipper and the North Star in the sky. Have you ever heard of Invivo?

The day and night of the stars are named by human beings. Since there are the Big Dipper, the Southern Dipper and the Polaris, there is no need to worry that humans will forget to get an invivo.

But Weaver has rarely heard of it.

First, it is not as famous and useful as Polaris, and second, it is not in our north.

There are many stars named after their directions. You can know that they refer to the stars in a certain direction in the sky. Since man has given the earth 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 around the earth is called the celestial sphere. People in the southern hemisphere see the sky basically in the southern hemisphere, while people in the northern hemisphere see the sky basically in the northern hemisphere.

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

It will be much better to understand the following explanation of stars.

Let's start with the Big Dipper.

The Big Dipper is the most famous astrology in China. In very early ancient times, people gave this star combination 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. Starting from Shaokou, they were named Shu Tian (Wolf-greedy), Tian Xuan (Giant Gate), Tianji (Lucun), Tian Quan (Wen Qu), Yuheng (Lian Zhen), Kaiyang (Wu Qu) and Yaoguang (Pojun) in turn.

As can be seen from these names, these seven stars are endowed with different jurisdictions and representative meanings. For example, Tianquanxing, also known as Wenquxing, is a symbol of ancient academic hegemony, and the first prize winner is Wenquxing.

These stars are in charge of all walks of life, each with 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 winter, and the world is spring; Bucket handle guide, the world is summer; Bucket handle refers to the west, and the world is autumn; Bucket handle refers to the north, and the world is winter? 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 of north latitude, so the southern hemisphere is not applicable. What about the ancients? This world? The vision is relatively small.

In fact, these stars are ordinary stars.

The stars are far away from us because of their own light. Although they are moving, relative to our distance, they seem to be moving very slowly 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 80, which is relatively weak. The ancient army used it to test soldiers' eyesight.

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

Speaking of Beidou, let's talk about Nandou now.

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 seven stars, but six stars. China also attached great importance to it in ancient times, believing and worshiping it like the Sun, Moon and Beidou.

Nandou Star is located in Sagittarius in the South, and it is the brightest main star.

The names of Nandou Six Stars are Tianfu Star, Tianliang Star, Tianjing Star, Tiantong Star, Tianxiang Star and Seven Killing Stars. In ancient China? Beidou is the master of death, and Nandou is the master of life? Statement.

In Taoist culture, the six-star monarch in the Southern Fight is the celestial official who manages all things in the world, such as man, demons, spirits, gods and immortals. Their respective duties are: the first Tianfu Palace is the star king; The next day, "xianggong" was Lu Xing's secretary; On the third day, Liang Gong was the King of Life-prolonging Stars; On the fourth day, for the benefit of the star king, the same palace; Fifth, Shu Tiangong is the proper star king; On the sixth day, the heavenly palace was the star king.

No matter whether Beidou hits south or not, it is a star dozens or even hundreds of light years away from us, which has nothing to do with our life and death. There is no point in studying these things, but many people have died.

Ironically, some people still waste their time on it and even harm the world. It's 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 were orbiting the earth.

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

In fact, the celestial sphere is not spinning, but the earth is spinning. It seems that the celestial sphere is spinning.

There is one place in the celestial sphere that basically does not rotate, that is, the imaginary axis points to the sky. That star, people call it Polaris.

The star there is now called Dog Chen Yi, which is about four times the mass of the sun, 434 light years away from us, and the visual magnitude is about 2, ranking 5 1 of the brightest star in the sky.

To find the North Star, you can cross the Big Dipper. On the edge of the spoon of the Big Dipper, the second celestial body is connected by Shu Tianxing, and there is a bright star about five times the distance between the two stars, which is the North Star.

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

This is because when the earth rotates, although the axis of the earth is basically motionless, it will be like playing a top. When the gyro rotates at high speed, it will swing slightly, and so will the earth axis. This is the so-called precession of the earth axis.

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

How big is this precession? It is estimated that there is a deflection of 50.29 "a year, so that the imaginary axis of the earth's north and south poles draws a circle in the sky, and a full circle is drawn in about 25800 years.

In this way, the sky pointed by the so-called north-south polar axis is not a specific star, but all the stars in the circle along the earth axis have the right to become the Polaris, and which star turns to which planet the earth axis faces becomes the Polaris.

Therefore, Polaris will change with the tide.

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

This determines that Polaris is not a single star, nor is it completely aimed at the North Pole, but is almost near the sky area referred to by the earth axis. Whoever can see this star closest will act as the Polaris.

Gou Chen's duty in Polaris began 1200 years ago, and another 400 years later, this position was given? Hook Chen Si? After that, the star was not bright, and the apparent magnitude was only 4.28, which was less than one-eighth of the brightness of Polaris.

By the year 13500, the familiar Vega will be Polaris, and in 25800, today's Gouchen will make a comeback.

Since the earth axis points to the celestial sphere 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 Antarctic and can only be seen in the southern hemisphere.

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

We can see more stars in the southern hemisphere on 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 Nantian, but only the stars at the southern end of Beitian.

So the southern hemisphere is the starry sky seen by the residents of 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 6000 stars in the night sky visible to the naked eye. These planets are distributed on the all-sky sphere, and our earth has the southern hemisphere and the northern hemisphere, so you can see about half of the stars, about 3000.

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

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

The star that is now in power in invivo is called the South Pole? Star, this star is about 280 light years away from us, and its apparent magnitude is about 5.6.

The larger the magnitude, the darker the star. The limit for humans to see the stars with the naked eye is 6, so what about this South Pole? The brightness of stars is weak to the limit of human eyes, and they can only be seen in front of us when the weather is very good and there is no light pollution, so they are not taken seriously.

Compared with Polaris seen in the northern hemisphere, the brightness of invivo is more than 20 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-the old star.

Sirius is the brightest star in the whole day, with an apparent magnitude of-1.47 and an apparent magnitude of -0.72.

People in the northern hemisphere near the south can see this 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 Lao Nian is the first bright star in the sky. However, this star is far from the south pole, not invivo.

This is the secret of the big dipper fighting south Polaris. Thank you for reading and welcome to discuss.

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