Night slowly fell, but the scene was stunned. Even Liu Xinyu couldn't care about the majesty of the empress, she opened her mouth wide in surprise, her eyes widened, and she looked at the 'globe' in front of her.

Today, we finally have the concept of 'planet'!

It has been more than three hours since the end of the sea trial, and Zhao Dahe is spitting and talking about his huge discovery.

Using the projection length of the wooden sticks at noon measured in the Taotu Continent and the Red Lotus Sect, combined with the projection length of the wooden sticks at noon in the country of Qixia, plus some knowledge inherited by Zhao Dahe himself, etc., Zhao Dahe calculated the diameter of the earth for the second time with the new mathematical knowledge of the Zhang family, and after repeated proofreading:

The last time Zhao Dahe calculated the diameter was 126,000 kilometers;

And this time, Zhao Dahe calculated a diameter of 128,700 kilometers.

Last time, Zhao Dahe calculated according to the records and data of the sect, as well as the Zhou Tianxing map, plus the mathematics of the Zhang family, etc.—there are more divisors. This time, the Zhang family's mathematics and wooden stick projection were used to make new calculations, and some divisors and errors were corrected to obtain a more accurate number.

The diameter of the earth is 128,700 kilometers, and we live on a single star! The area shown by the earth is only about one-tenth of the surface area of this star!

And 9 out of 10 worlds, the unknown world!

Zhao Dahe's calculations are very complicated, and many of them are even helped by Huang Mingshan and others. Huang Mingshan and others have grown into scientific personnel and pillars of the Zhang family.

Looking at the three-zhang long scroll of Tianma paper, densely packed with calculations and proofs, everyone felt a little dreamlike.

And this time Zhang Shengye did not refute it, because compared with Zhang Hao's 'casual nonsense' at the beginning, Zhao Dahe proved his conclusion in a mathematical way and various evidence!

Precisely the numbers, the other cut language all look pale.

The earth under our feet is a star, and we ourselves are people living on the stars! After discussion, Zhao Dahe and Zhang Hao named the planet under our feet: Tianyuan.

The so-called Tianyuan, the beginning of heaven and earth, the center of Zhoutian. In the ancient legend, there are 366 stars in Zhou Tian (it is said that Zhang Hao looks at the starry sky and doesn't know how to count the 366 stars), but what everyone has observed is 365 stars. A star has vanished.

For a long time, everyone has had a variety of speculations about this vanished star, and one of them is that there is still a "origin" star that has not been found. Everyone named this star 'Tian Yuan'.

But over the years, many astrologers, and even many cultivators who have studied "Zhou Tiangong" have been looking for this 'Tian Yuan Star'. Outcome...... It's right under your feet!

Such a result made countless people on the scene think knotted, which was too dramatic.

Then Zhao Dahe carefully adjusted the direction of the "globe" that had just been made, which should be said to be the "Tianyuan Instrument", so that the "enclosing elephant" on the Tianyuan Instrument tilted. The east is upturned, and the west is sinking.

However, for the time being, Zhao Dahe does not have the concept of latitude and longitude, the Arctic Circle, the equator, etc., and he only makes adjustments based on some information he knows.

But this adjustment is very similar to what Zhang Hao did before.

Zhao Dahe adjusted for a while, and finally took a few steps back to look at it before he said to everyone: "Everyone, this should be the location and approximate location of the map on the elephant." ”

Liu Xinyu finally let out a slow breath and spoke: "I have a question, why are we in the north and not in the south? Since we live on a 'planet', why can't we be in the south?"

Zhang Hao smiled: "It's very simple, because we discovered this secret, so we stipulate that we are here in the northern hemisphere!"

Can you still do this...... Liu Xinyu blinked a little stunned for a while, and finally had to nod in agreement. Yes, we found it, of course we were in the Northern Hemisphere. Tradition holds that the north-south direction and the north are precious, and the east-west direction is respected.

However, Liu Xinyu still had questions, "Since we live on one planet, why haven't we entered the outside world? What is between each star? How far away, can we reach other stars?"

Zhang Hao looked at the empress dumbfounded: Now you want to go on an expedition to other planets? Your ambition is a bit big! Well, it is a good thing to have ambition, it is better than no goal. Having said that, cultivators live a long life, and maybe Liu Xinyu really has the day to conquer the starry sky.

However, Zhang Hao couldn't answer Liu Xinyu's current question - gravitational force or something, it would be a bit shocking to say it now, and it would also expose himself.

The discovery of gravity represents the beginning of human transformation and manipulation of the natural world. There are many secrets such as why water flows downward, why people stand on the earth instead of floating to the sky, and the movement of the sun, moon and stars, all of which require the key of 'gravitation'.

But to explain gravity and prove it mathematically, you need geniuses. It's a pity that Young Master Zhang remembers a lot of things, but there are many more things that he can't remember. He knows gravity, but how to prove it...... Sorry, didn't know!

In fact, using mathematical methods to prove gravitation is a very complex calculation, and it requires complex experimental data, etc. The most important thing is that there needs to be enough scientific accumulation.

Zhang Hao will promote the development of science and industry, but he will not casually promote the growth of seedlings.

And before gravity, an important scientific foundation is needed: Kepler's theorem, that is, the mathematical method of calculating the orbits of planets, etc.

Yes, gravitational force needs to be calculated from a large perspective, and it needs to be looked for from astronomy and a lot of observations. It is difficult to obtain sufficient data based on observations from inside the planet alone.

So in the face of Liu Xinyu's question, Zhang Hao could only shake his head.

Not to mention Zhang Hao shaking his head, even if it is Zhao Dahe now, he can only shake his head.

As the two shook their heads, the atmosphere was silent again. After a while, Liu Xinyu smiled faintly: "Forget it, if you don't understand, you can't figure it out, life is going on anyway."

Zhang Hao, today's events have opened my eyes, but to be honest, I still have some doubts. ”

"Your Majesty, don't say you're confused, I'm confused too. But I trust the data in front of me more. Our eyes and senses sometimes deceive us, but the data that has been accurately measured and calculated does not. ”

Liu Xinyu nodded slowly, "It just so happens that we are still discussing the issue of the era name during the Chinese New Year, and we will use 'Tianyuan' as the new era name in the future." I think, we have the qualifications!

This year is the first year of Tian Yuan, and in the future, our era will continue to be the name of Tian Yuan forever!"

You want to be this empress forever. Zhang Hao had a little banter in his heart, he had just begun to have a hazy understanding of the world, and the empress's ambition had swelled to this extent.

Everyone gradually dispersed, but Zhang Hao did not ask for secrecy. Because it is not necessary, and the development of the country of Qixia in the future also needs this kind of geographical knowledge to pave the way.

Even if other countries knew, it would be useless - without steel warships, they would not be able to explore this world! This is the world of cultivation, and the sea is full of demon beasts. Not to mention ordinary wooden ships, even warships of insufficient quality may not be able to cross the open sea.

Because there was no need to keep it secret, the news spread throughout the country of Qixia just a few days later. In particular, the empress officially used 'Tian Yuan' to record the year, which caused a huge response.

The legendary Tian Yuan Star has been found, and it is actually right at our feet—this news alone is enough to shake the cultivation world!

I looked for the stars that I hadn't found for tens of thousands of years, but it turned out to be a real donkey looking for a donkey.

But then it caused even more concussions -- we live on a star, or rather, do we live on a planet?

Is the earth spherical? Is it really fake? Then why didn't we fall? What is outside the planet? Are all the stars in the sky planets? Is the earth under our feet really 128,700 kilometers in diameter?

The news spread throughout the western part of the Fertile Continent with indescribable speed, and then spread rapidly. The rest of the countries could not block the exchanges between the Yuan Infant Period, let alone the exchanges between the Transformation Stages.

However, the 'earth circle theory' spread, but the related mathematical calculations and so on, are kept secret - the results can be made public, but the process must be kept secret!

And the best evidence to prove the earth's circle is - the lighthouse!

The light of the lighthouse is brilliant, reaching high in the sky, especially in this world, where the atmosphere is thick, and there are many layers of white clouds in the sky. When these white clouds are lit up by the light of the lighthouse, they invisibly become a sign that verifies the earth's circle.

On clearer days, the clouds are almost close to the surface when viewed from dozens of miles away, and as they get closer, the clouds get higher and higher.

There is also the first peak in the country of Qixia, Yuyang Mountain, which used to be the station of the Jiuyang Sect, and the top of the mountain is also seen first when observed from a distance. The morning and evening sunshine will also stop at the top of the mountain.

In the past, there were many explanations for the sunshine of Yuyang Mountain, but only today's explanation is the most convincing. It's just that the response is too big.

But it also sparked more discussion – why didn't we fall, what forces are holding us back......? Is this the legendary power of the stars?

And the more serious question comes: since we are on the stars, where is the legendary fairy world, and where is the hell?

The discussion intensified, and the Zhang family took the opportunity to push Zhao Dahe to the foreground, and used this to attract many eyes.

This time, Zhang Hao did not use the name of Dayang Group, but used the name of 'Zhang Family'. Knowledge must be in your own hands!

In such an atmosphere, the Zhang family finally made an important decision: to build a school. An institution that teaches various scientific knowledge such as spiritual practice, alchemy, industry, commerce, geography, etc., and recruits students from the land of Qixia.

And the Zhang family promises: free education!

Name of School: Beidou Academy.

For a while, the country of Qixia became more lively.

(People often say that they send me blades, and they are so enthusiastic that I can't sleep most of the night.) ）