The establishment of the Great Song Dynasty court began with the rebellion of the military generals, the Taizu Emperor of the Great Song Dynasty, originally just a military general, because he held the military power in his hands, so, just after the death of the emperor, he usurped the throne and became the emperor, and because for a long time before the Great Song Dynasty, the examples of usurpation of power after the military generals mastered the army are really many, even the old Zhao family is like this, it can be said unceremoniously that the hundreds of years before the Great Song Dynasty was an era of frequent usurpation of the throne by military generals.

After the establishment of the Great Song Dynasty, in order to prevent the country from being usurped by his subordinates again, Taizu Zhao Kuangyin first made a glass of wine to release the military power, so that the generals with many mercenaries under his command took the initiative to give up the military power in their hands, and then raised the status of the civilian officials, so that the civilian officials could suppress the military generals and prevent the military generals from becoming stronger.

In terms of details, military generals must be monitored by civil officials and court envoys at all times, and the grain and grass in the army are also rationed, and cannot exceed a certain amount, otherwise, it will be a violation of the laws of the Great Song Dynasty court, and there will be a suspicion of rebellion.

Through so many practices, it can indeed play a role in suppressing the generals, which can greatly prevent the usurpation of the generals, but everything is advantageous and disadvantageous, while restricting the usurpation of the generals, it also restricts the hands and feet of the generals, so that the generals can not fight particularly as they want, when they can't attack, because of the order of the court and the supervision of civil officials, they have to fight, resulting in defeat, and when they need to attack, because the court does not allow it, they will also miss the opportunity in vain, which will naturally greatly limit the military strength of the Great Song Dynasty. It's just that the rebellion has been avoided.

That is to say, the Great Song Dynasty is a family in the world, and the emperor cares more about whether his throne is stable, as long as the throne can sit firmly, they are very satisfied, as for the humiliating to the Liao State and the Western Xia New Year's coin, they don't care, anyway, the Great Song Dynasty Court can afford it, as long as the Liao State and the Western Xia are appeased, they will not enter the army, and if they don't enter the army, the Great Song Dynasty army will not have to fight, and the generals will have no opportunity to exert their ability and expand their influence, and the possibility of usurping power is almost impossible, and the throne will be stable, there is nothing more reassuring than this Emperor Song.

But the majority of patriotic literati did not think so, and there were many virtuous people among them, and these virtuous literati were very dissatisfied with the weak practices of the imperial court, but they could not resist the decision of the imperial court, so they used the opportunity to write poems to express their inner dissatisfaction.

Moreover, in Su Shi's poems, there is no direct rebellion against the imperial court, but only the astronomical phenomenon of looking northwest and shooting the wolf, but all literati who know poetry can realize that what Su Shi said about Sirius is alluding to Western Xia, but Su Shi expressed it like this, it is completely a patriotic feeling, so even if some people are dissatisfied with this, they can't find a reason to deal with Su Shi, they can only affirm that he is a patriotic poet.

Since ancient times, people have thought that Sirius is a star, in fact, after astronomical observations in later generations, Sirius is a double star, that is, composed of two stars, one of which is very bright is the blue dwarf in the main sequence star, and the other star is a white dwarf, the brighter one, its actual brightness is 24 times that of the sun, it can be seen that its brightness is very high.

Because of Sirius's position in the Southern Hemisphere, when observing in the Northern Hemisphere, you will always see Sirius hanging on the edge of the sky, that is, it is relatively low, but in the summer, the situation may be better, and in the northernmost part of the Northern Hemisphere, Sirius will not be visible.

There are still a lot of legends about Sirius, and in the Chinese Empire, since ancient times, Sirius has been synonymous with calamity, and no one likes Sirius.

In ancient Egypt, when Sirius rose over the eastern horizon at dawn, it was the time of the annual Nile flood, which irrigated large areas of fertile land on both sides, and the Egyptians began their cultivation again.

The ancient Egyptians recognized that when Sirius rose with the sun, the Nile Delta began to flood every year, and they also found that the time interval between Sirius and the sun rising together was not 365 days in the Egyptian calendar, but slightly more, and the ancient Egyptians identified the day before dawn, Sirius rising in the east as the beginning of the year, that is, the predecessor of the Gregorian calendar used by our later generations, which was born from ancient Egypt at the earliest.

In addition, the construction of the pyramids, in many ways, is also related to astronomy, for example, Sirius has a great relationship with the pyramids, the direction of the pyramids is the direction of Sirius, and, in addition to the pyramids, many buildings in ancient Egypt are facing Sirius, which is very difficult to understand.

Maybe this is Sirius worship! After all, every time Sirius and the sun rise at the same time, the lower reaches of the Nile will flood and nourish the surrounding land, making the land more fertile, and all agricultural production in Egypt is closely related to the rise and flow of the Nile, so the Egyptians regarded Sirius as a god, worshipped it, and even built temples in the same direction as Sirius rose.

One of the most amazing places is that the ancient Egyptians actually knew that Sirius was a binary star system, which was discovered with great effort in later generations, and how did they discover that Sirius was a binary star system in backward ancient Egypt? It's very puzzling.

Both the ancient Egyptians and the gods must have spent a lot of time observing the celestial phenomena, especially Sirius, and the ancient Egyptians had a very large concept of the Sirius periodic calendar, which they believed was given by the gods.

The so-called Sirius cycle refers to the cycle in which Sirius rises again in the same place as the Sun, and this cycle is very close to the year after this.

Of course, knowing that Sirius is a binary star system, in addition to ancient Egypt, there is also an indigenous people of Africa, who have always maintained a primitive jungle life and have little contact with the outside world.

And this indigenous people of Africa actually knew the mystery of Sirius's color change.

Sirius is one of the brightest stars in the night sky that can be seen by the naked eye, but there are many ancient astronomical writings that record that Sirius is dark red, and Sirius in the eyes of modern people is indeed white. This bothers a lot of scientists.

But this primitive tribe of Africa told scientists that Sirius is composed of a large star and a small star, the small star is a black, extremely dense and invisible companion star, which orbits the big star in an elliptical orbit, and they also know that the small star has a period of 50 years.

They have been saying for generations that Sirius is the smallest and heaviest star in the sky, with a luminous metallic substance that is not found on Earth, and in an accident, Sirius suddenly explodes and emits a strong light, which gradually fades afterward. Although the aborigines could not see the faint companion star with the naked eye, the old people were able to draw the path and various patterns of the two stars on the ground with their walking sticks. When Sirius appears between the two peaks, a ritual called Sigyu is held, which takes place about once every sixty years and is the most solemn religious ritual.

Later generations of scientists believe that the knowledge of Sirius by indigenous Africans is both detailed and accurate. As we have seen, they, like us, have the idea that the Celestial Ruthless Star has an invisible companion star. The aborigines call this companion star the Valley Star. And the reason why it is called the Valley Star is probably because it is so small that it is almost impossible to see. According to these natives, the valley star was made of the heaviest metal known today, which was even heavier than iron. This means that these indigenous Africans know that the celestial star companion has a great density.

The indigenous Africans also painted many ceremonial drawings of the Sirius system, which showed that they understood that the orbit of the Sirius companion around the main star of Sirius was elliptical, and that the central position was the main star of Sirius, and according to indigenous legends, later scientists even drew a picture of the oscillating orbits of Sirius and the valley star, which turned out to be strikingly similar to the same diagram drawn by modern astronomers of the main and companion stars of Sirius.

According to the indigenous people of Africa, their ancestors' knowledge of Sirius' companion was imparted by a god from above. The natives still have a picture clearly depicting their god descending from the sky and descending to their clan in a large ship with flames in tow.

This indigenous African astronomical tradition is not limited to Sirius. They said that Jupiter had four moons and Saturn had rings, and they represented these two planets in their map.

These magical places have become the world's unsolved mysteries.

Ang Lee believes that since it is recorded in ancient books that Sirius is dark red, then, in ancient times, Sirius is likely to be dark red, but because of the changes of the times, this star has changed color, otherwise, could it be that the ancients were lying, and what are the benefits of the ancients lying? No, deliberately write white as dark red! This is so unreasonable.

"What, this brightest Sirius, which used to be dark red, really? I haven't seen a star of any other color? All I could see were small white stars. ”

Li Xiaolu said.

Obviously, she is telling the truth, not only has she not seen it, but Ang Lee has not seen it either, and everyone in later generations has not seen it, and even many people do not believe in the existence of Red Sirius, thinking that it was written by mistake when the ancients recorded it, or that they had pink eye or something, and everything they saw was red.

But Ang Lee prefers to believe that this is true, because when the ancients recorded historical events, they were very rigorous and would never deceive, since many ancient books recorded Sirius as dark red, it is enough to show that Sirius is really red at some times.

"Actually, I haven't seen a red star either, but in many ancient books of the Tang Dynasty, red Sirius is recorded, perhaps, under certain conditions, Sirius will turn red! However, none of this matters, what hangs in the sky is just a star, and it has little to do with us. ”

Li An said.

After all, the changes of these stars often take hundreds of millions of years, and the lifespan of these stars is also very long, and it will not have any impact on the earth in a short period of time, at least, in the short life span of human beings, these stars will not be felt to have much change, in front of the life span of human beings, these stars are eternal.

"Oops, my head is a little dizzy when I see it, if I don't look at it, I can't watch it again today."

Li Xiaolu kept hooking her head to look at the stars outside the window, and after a long time, her neck was naturally a little unbearable, very sore, very uncomfortable, in short, very uncomfortable.

"Haha! Of course it's uncomfortable for you to keep hooking your head, come, don't look at it, lie down in my arms and sleep! ”

Li An said very intimately, gently stroking Li Xiaolu's back, letting Li Xiaolu close her eyes and rest.

Astronomy is a very interesting subject, but at the same time it is not so easy to learn, after all, there are so many stars in the sky, there are so many of them, just to remember the names of these stars, let alone the occurrence of new stars.

However, for ordinary people, there is not much to know, only some basic astronomical knowledge is required, so it will not be very tiring.

There are so many stars in the sky, but the number of stars that Ang Lee knows is not much, I'm afraid it's not even one ten-thousandth, but it is enough to know some of the more famous stars, as for those less important stars, it is tiring to understand, and it doesn't make much sense.

The astronomical knowledge that Li Ang already possessed was enough to be stunned in front of the little girl, so naturally there was no need to continue to understand it in depth, so as not to waste his precious brain cells.

Li Xiaolu was really tired, after lying in her arms, she fell asleep as soon as she closed her eyes, obviously not pretending to be asleep, Li An could feel it.

"Sleep! Go to sleep! When we get to the boat, let's count the stars slowly. ”

Li An smiled faintly, looked sideways at the sky outside the window, these stars hanging in the sky, there are too many stories, even if Li An only understands some of them, it is enough to show off to others, as long as he is not a scholar specializing in astronomy, ordinary people really can't compare to Li An, after all, Li An has more knowledge than people in this era for more than a thousand years, it is not a grade at all, Li An's strength is beyond their reach, so, if you talk about astronomy, Li An can kill almost everyone in the Tang Dynasty in seconds.

As for the officials in the Tang Capital who specialize in astronomy, they are the only existence that Li Ang can't match, they have been tinkering with this thing all day long, and Li Ang can compare to them.