Du Ruhui's breathing is a little heavy, 20,000 acres of first-class fertile land, which ...... It's almost more than all the fields in Datang now.

"However, we are not very efficient now." Li Shimin next to him spoke.

"Oh, this case, I give you the blueprints, the drawings of the improved Quyuan plow, which is a gift from me to Your Majesty, a horse and a cow can be used to plow the land, which is very convenient." Huo Gang smiled and said, it doesn't matter if these things are small things.

"Thank you, Chief." Du Ruhui next to him directly bowed.

Huo Gang smiled, Du Ruhui was crisp enough, and his ability to fight snakes with sticks was enough.

"Leader Huo, is this Beihai the one we Datang said?" Li Shimin pointed to Lake Baikal on the map and asked.

"Yes." Huo Gang nodded.

"If that's the case, Su Wu was herding sheep here for 19 years, and this North Sea is already a land of ice and snow, so most of this area further north should be inhabitable." Li Shimin pointed to the vast land farther north.

"Actually, these lands are not as big as they imagined." Huo Gang thought for a moment, and then spoke.

"Oh? Why did the chief say that? Li Shimin looked at Huo Gang with some confusion and asked.

"That's right, Your Majesty, Duke Du, you should know that the earth under our feet, or our world, is a ball, right?" Huo Gang thought about it, these geographical knowledge still need to be popularized, of course, the reason why he asked this is because when he chatted with those craftsmen before, these craftsmen knew that the earth under their feet was spherical.

"Yes, this theory comes from Zhang Heng in the Eastern Han Dynasty." Li Shimin nodded directly and said.

"Well, since Your Majesty, Duke Du, and General Li Ji all know about it, there are some things that we can explain much better." Huo Gang said with a smile, explaining this is much easier than asking them to turn the round sky into a planet.

"Bring in the second gift." Huo Gang said directly.

"Yes!" Huo Zheng next to him immediately turned around and left the room, called a guard to come in from the outside, and then pried open the box outside, and then the two of them carried out a round thing from the inside, if someone is like Huo Gang from more than a thousand years later, it is estimated that they will recognize it immediately.

It's a globe!

That's right, it's a globe carved and colored by Rumu. It is carved out of pure wood, and the wood in the middle that serves as a globe is a complete wooden ball, so it is heavy.

In addition, the base is made of cast iron, so its weight is not light at all.

Carrying it into the house and putting it on the coffee table next to it, Huo Gang smiled and said, "This is a globe, oh, the earth is what I call the world we live in, it is a complete planet." ”

Huo Gang didn't bother to explain so much, anyway, how comfortable he was. Although it seems that the earth was also created by ancient people, most of them called it the earth star.

The oceans, islands, etc. on this globe have almost been carved, the only difference is that the American continent and Oceania have not been carved.

"This?!" Li Shimin and Du Ruhui both came over with a look of amazement, because this thing is too exquisite, to be precise, no one has ever expressed it so accurately.

"According to the research of our astronomers......" Huo Gang said directly.

"Chief, who is this astronomer?" Du Ruhui was not ashamed to ask, and if he didn't know, he asked directly.

"An astronomer is a scholar who studies the relationship between the stars, the sun, the moon and the earth." Huo Gang said with a smile.

As soon as Huo Gang said this, Du Ruhui and the others immediately understood that this was the role of the Taishi Bureau.

"According to our astronomers, the sun revolves around our earth, and our earth should be tilted in such a way that the angle of the sun's rays on our earth will be different over time."

"When the sun shines directly, the weather is the hottest time, and this is bounded by the equator, which is this dividing line in the middle of the earth."

"I call this a dimensional ......" Huo Gang roughly told them the definition of latitude and longitude, without going into too much detail, just let them roughly understand.

"According to the research of our astronomers, the sunlight moves back and forth at about 23.5 degrees north and south latitude, so the equator here is hot all year round, only summer, there are no four seasons, which is why the land here can be harvested three times a year."

"In the same way, when sunlight turns into summer here, it turns into winter in the Southern Hemisphere."

"Then, when the sun's rays reach the southern hemisphere, these places in the extreme north will become eternal nights for months! That is to say, there is always night and no day, which is why it is so cold here, and it is icy and snowy all year round. ”

Basic astronomical knowledge, although Li Shimin, Du Ruhui and these people are all smart people, but what they listened to was also a little inexplicable, at first they actually had some doubts, but with Huo Gang's explanation, they found that what Huo Gang told was correct with all the things they experienced in their daily life, so this knowledge was too valuable.

This knowledge is not systematic at all, and they study more of the stars and the like.

"And knowing this knowledge helps us to grow different plants, just like some plants that grow in the tropics can't survive in the north because they can't withstand the cold of the northern winter."

"However, this does not mean that there is no way to survive in this further north, after all, whether it is the Huns, the current Turks, or other nomadic peoples, they have always expanded their territory to these places."

Huo Gang pointed to the place of Siberia in the future and said, "So in fact, it is not difficult to survive in these places. ”

"In addition, we speculate that there is a very likely continent on this side that is no less than ours." Huo Gang pointed to the other side of the earth, that is, the place of the Americas in the later world.

"But it's tens of thousands of miles away from us, and ships can't travel that far now, so there's no good way. But I believe that with the continuous improvement of the production technology of ships, sooner or later we will be able to reach these places, and when the time comes, we will find out whether there are new continents here. ”

"And all of this shows how vast this world is, since you were born in this world, isn't it a pity not to see these different places? Just like Your Majesty, don't you want to see the ice and snow in the north, and don't want to go here to see the perennial heat? There is a beautiful ocean, a beautiful tropical landscape, which is not something that can be seen in that high palace. ”

"There is a saying that is not good, it is better to read ten thousand books than to travel ten thousand miles, some things, only if you see it with your own eyes, you can understand what it means, if Your Majesty you don't come to Yumen Pass, I think, even if General Li Ji personally wrote it down, recorded it, and sent it back to Your Majesty, I don't think Your Majesty you may not believe it."

"Actually, that's why I want to see Your Majesty." Huo Gang smiled and said, "Because there is some cooperation, unless Your Majesty sees it with your own eyes and hears it with your own ears, you will not believe it." ”

Li Shimin put away his shocked expression, he looked at Huo Gang and said seriously, "The leader is right, if I hadn't come to see the leader in person, I'm afraid I would have regretted it for the rest of my life." ”

"In that case, why don't we talk about how to work together?" Li Shimin said seriously, "For example, how to cooperate between our two sides, how to carry out the existing trade, and so on." ”

"No problem." Huo Gang smiled, then pointed to the side and said, "Your Majesty, please take a seat." ”

Everyone sat down on the sofa again, Li Shimin paused for a moment, and then continued to speak: "Don't hide it from the leader, when I came to Suoyang City, my Datang had actually started a war. ”

"Oh?" Huo Gang showed a trace of doubt on his face, and he looked like he was listening, but he was a little surprised in his heart, because it meant ...... His influence on Datang was unconsciously so deep, and Datang at this time in history definitely never launched a war against the outside world.

The war with Jieli also began in the third year of Zhenguan.

"I, General Li Jing of the Tang Dynasty, have led the army to attack Tuyuhun's territory, if nothing else, Tuyuhun will soon be destroyed by my Datang." Li Shimin said directly.

"That's a good thing." Although Huo Gang was a little amazed in his heart, he didn't have any expression on his face, because Tuyuhun, that is, Qinghai in the later generations, Huo Gang had never thought about occupying it, because that place was ...... It is a pity to dispossess it, and there are not many resources available, but there is a lot of price to pay to maintain local stability.

But why Li Shimin did this, Huo Gang had probably guessed it in his heart, and the reason was very simple, it must be to defend against their big man.

I have to say that if the Tang Dynasty really takes Tuyuhun, it means an absolute change in history, because not to mention the first year of Zhenguan in history, the entire Tuyuhun was not destroyed by Tubo until the last year of Zhenguan.

And the place where Tuyuhun is located, the part of Qinghai in the later generations, the Tang Dynasty has never occupied it, and it has always been under the occupation of Tubo, but now Tubo doesn't know where it is.

The Tibetan tribe where Songtsen Gampo is located is still a small tribe attached to Tuyuhun.

Although the Tang Dynasty once established the Anbei Metropolitan Protectorate, the Anxi Metropolitan Protectorate, the Murwei Metropolitan Protectorate, the Indigo Mohe sound with the Mohe, and the location of the Mohe River in later generations happened to be the location of the Intarsal Ministry, the Metropolitan Protectorate, etc., jointly ruled the vast territory, but in fact, these Metropolitan Protectorates did not solve the most direct ruling problem.