Datang: Time travel in two months, wait online, hurry up!

Hearing Li Ke's words, Yuan Tiangang and Li Chunfeng were stunned for a moment, their eyes filled with shock!

Obviously, the two of them never expected Li Ke to come to such a conclusion!

The muddled way of thinking is that the world is like an egg, the sky is the shell of the egg, and the earth is the yolk of the egg.

The earth is above the water, the sky is above the earth, and the water is below.

This is actually ahead of the original concept of a round sky and a place, but it is still far from the real earth.

"That's the world we live in."

Li Ke asked someone to bring a simple globe he made before, and put it in front of the two of them.

"Under our feet, there is not endless water, but on the far side, there is actually another continent."

Li Ke explained to them.

In order for Yuan Tiangang and Li Chunfeng to become talents in astronomy and geography that are helpful to him, they need to change their cognition.

"Is there another continent under our feet?"

Hearing Li Ke's words and looking at the globe in front of them, the two felt shocked in their hearts, and their minds were also in a mess.

Their original worldview and cognition have suffered an incomparably huge impact!

Turning the globe in front of them, continents and oceans appeared in front of their eyes.

Soon, they saw familiar figures on the globe.

That was the territory of the Tang Dynasty, including the peninsula where Goguryeo, Baekje, and Silla were located not long ago, as well as the Wa country in the east.

"It turned out to be really spherical!"

They have seen it over and over again, and they have never heard of many places, and they have no idea that there is such a huge territory in a distant place.

But at least until now, they can't think of any reason to refute that the world is spherical.

Moreover, looking at the globe in front of them, they think it makes sense.

Especially thinking that there were many things before, including the sun, the moon and various astronomical anomalies.

There are still many things that cannot be explained before, and the reasons cannot be found.

But if the world is imagined as a sphere, then many things can make sense!

For a while, many problems that had troubled them for many years, after they imagined the world as a sphere, they immediately figured it out!

This made them even more shocked, because the world is very likely to be a sphere as Li Ke said!

"However, if the world is a sphere, how will the people on the land under our feet survive? How will houses be built?"

Li Chunfeng couldn't help thinking of a question.

Their side is frontal, so isn't it completely upside down under the sphere?

If so, how are the people over there going to survive?

Yuan Tiangang also frowned slightly, apparently also thinking of this question.

Hearing this, Li Ke couldn't help laughing.

This is one of the reasons why people nowadays think that the earth has only one side.

Because, if the earth is spherical, how can the other side stand firmly on the ground?

How can a house be firmly built on the ground?

It seemed that he was going to teach the two of them a good lesson.

Gotta tell them what gravity is!

PS: The first update! .

Chapter 342 Prepare for returning to Chang'an City!Build the railway from Yangzhou to Chang'an!

"You two, when the fruit on the tree is ripe, why do they fall to the ground? Instead of flying to the sky?"

Li Ke smiled slightly and asked the two of them a question.

It is also a classic story of Newton being hit by an apple.

"Because the fruit has weight, it will naturally fall to the ground~"

Li Chunfeng and Yuan Tiangang replied without hesitation.

Moreover, the two looked at Li Ke with puzzled expressions, not understanding why Li Ke would ask such a simple question.

"No, no, this is because of the gravity from the center of the earth, and the center of the earth has gravity for everything in this world."

"This powerful gravitational force can make everything fall towards the center of the earth."

Li Ke shook his head, and proposed to them the concepts of gravity and universal gravitation.

"Gravity?"

Hearing this novel concept, Yuan Tiangang and Li Chunfeng couldn't help being slightly taken aback.

"Our world is like a spherical magnet, and the surface of the magnet is the land and sea where we are."

"Gravity is like the attraction of a magnet, attracting the iron metal that is close to the magnet, and then firmly adsorbing it."

"This king explained it this way, you should be able to understand it?"

Li Ke was afraid that the two of them would not understand, so he gave them an example with a magnet.

"I see!"

When Li Ke said that, they immediately understood.

According to this, even on another continent under their feet, people can stand firmly on the ground just like them, and houses can also be firmly built on the ground.

"In fact, there is another way to prove it."

"When sailing at sea, the first thing you see is the mast and sail of a distant ship, and you can't see the hull until you get close."

"That's because the world is spherical."

Li Ke smiled, and then gave them another example.

After listening to Li Ke's words, Yuan Tiangang and Li Chunfeng felt as if a new door had been opened in their hearts!

Being completely different from the previous cognition, the shocking brain was dizzy.

For the next few days, Li Ke was explaining some knowledge about this world to them.

Fortunately, the two of them got used to it quickly and began to understand the knowledge Li Ke said, except that the world view and cognition view were a bit harsh at the beginning.

In addition, the two of them already have deep research on astronomy and geography, but they just entered into some misunderstandings before, which led to a bottleneck.

Now that Li Ke has imparted correct and systematic knowledge to them, their progress can be called rapid!

Is rapidly transforming and growing into a qualified astro-geographer.

After giving them two books on astronomy and geography, Li Ke also felt that it was almost the same.

"This is the concept of latitude and longitude and sextant. Take it back and study it, draw a complete map marked with latitude and longitude as soon as possible, and research and create a sextant."

Li Ke gave Yuan Tiangang and Li Chunfeng the information about latitude, longitude and sextant, and asked them to study it in Yangzhou.

"Yes, Your Highness!"

Yuan Tiangang and Li Chunfeng immediately nodded respectfully.

In the past few days, they have been completely conquered by Li Ke's omniscient knowledge!

In their view, Li Ke is definitely the reincarnation of a god, otherwise how could he have such a clear understanding of this world?

Not only know that the world is spherical, but also know the continents and oceans in this world thousands of miles away.

You know, this is a place that no one has ever been to. Where did Li Ke know about it?

Isn't this the reincarnation of a fairy?

In particular, they are all engaged in metaphysics, and they believe in this statement more than ordinary people.

Therefore, the two of them now respect Li Ke from the bottom of their hearts, or in awe!

Next, Yuan Tiangang and Li Chunfeng began to study the latitude and longitude.

After learning about it, the two of them couldn't help being very shocked.

Because of this latitude and longitude, it is equivalent to dividing the whole world into points.

The point where a line of longitude and a line of latitude intersect is a coordinate, a location.

Undoubtedly, you can immediately find your location on the map. This is really a nautical artifact!

To obtain coordinates, a sextant is required.

A sextant is used to measure the angle between the sun or other celestial body and the sea level and horizon at a certain moment.

Through this angle, the approximate latitude and longitude of the ship can be calculated.

It can be said that with the map marked with latitude and longitude, plus the two-piece set of sextant that can obtain latitude and longitude, the sea is no longer vast!

They were also very shocked that Li Ke could think of these two methods.

But after the shock, there is excitement, because these two things are really the best research direction for those who study astronomy and geography.

So, they plunged in and studied it like a fascination.

Both felt that coming to Yangzhou this time was the most correct decision they had ever made in their life.

In Yangzhou, they will achieve achievements and fields that were impossible in this life.

While the two of them were fascinated by the research, Li Ke also inspected the firearms workshop.

At present, the output of the gun workshop is still maintained at about 3 per month, and now every time one is produced, it will be immediately taken away by the Yangzhou navy.

After all, all the 1 muskets in stock had been taken away by the Shenji Battalion, and the newly added 1.4 navy troops in Yangzhou were still waiting to receive muskets.

As for muskets, Li Ke has nothing to improve. After all, this kind of needle-fired gun is already in place in one step.

More needs to be improved in terms of bullets, from paper shell bullets to copper shell bullets.

Paper shell bullets are enough now, but they still have various shortcomings. They are not as advanced as copper shell bullets, and their power is not strong enough.

Li Ke gave the people in Bullet Workshop a piece of technical information and asked them to study it by themselves.

Now the research and development capabilities of these workshops are very good after he has cultivated and guided them for so long.

Some of the technical materials he took out, they got started and developed a lot faster, which made him very satisfied.

If he took out these things when he first traveled here, I'm afraid these craftsmen would be completely confused.

It can only be said that in a characteristic environment, people grow very fast after being exposed to new technologies and new knowledge.

Then he came to the gunpowder workshop. The production of copper-cased bullets is not just a matter of the bullet workshop, and the explosives used as fuses are also critical.

Therefore, he also gave the Taoist priests the principle and formula of explosives, as well as the manufacturing technology.

And also set up a grenade team, gave them the design drawings of the grenade, let them study the grenade.

After figuring out the design and construction principles first, when the explosives are researched, you can try to produce and experiment.

Grenade is also a battlefield killer. In some specific battlefield environments and terrain conditions, grenades can play a role that artillery and guns cannot achieve.

After that, he came to the Artillery Workshop.

To be honest, although the artillery was invincible on the Goguryeo battlefield, it became the nightmare of the Goguryeo and Baekje soldiers.

The soldiers of the Shenji Battalion and the Yangzhou Navy, including Li Shimin, were all very satisfied with the power of the artillery.

However, Li Ke himself is still not satisfied with the power of this kind of artillery that fires solid shells.

The main reason is that they have never seen a more powerful artillery, and think that this kind of powerful artillery is already a dimensionality reduction strike.

But Li Ke has seen all kinds of more powerful artillery in later generations. This kind of antique artillery is only used temporarily, and he is definitely not satisfied.

Anyway, the technology of artillery has stabilized now, and we just need to continue to produce it.

The R&D personnel of the artillery workshop can also start researching more advanced artillery.

"Next, your main task is to study breech-loading smoothbore guns and flowering ammunition!"

Li Ke explained the task to the R&D personnel of the Artillery Workshop.