I will make Qin Shi Huang immortal in the Great Qin Dynasty.

One hundred and fifty million miles.

Ying Zheng had no concept of this number.

He didn't know how far 150 million miles was, how many years it would take to walk from Earth to the Sun, or whether this distance was long or short compared to other distances between heaven and earth.

But he knew one thing: if the sun was really 150 million miles away from Earth, then the sun itself must be incredibly large.

Only something large enough can still appear large at such a distance.

"The Earth revolves around the sun," Qin Tian's voice continued. He flicked the Earth model with his finger, and the small blue sphere began to slowly rotate around the sun. "One rotation is one year. Because the Earth is sometimes closer to the sun and sometimes farther away from it as it revolves around the sun, the angle of the sunlight also changes, which is why we have the four seasons of spring, summer, autumn, and winter."

Ying Zheng's gaze followed the rotating Earth, and a dazzling and mesmerizing image rapidly formed in his mind.

He stands on Earth, which revolves around the sun, which burns silently in the void.

He used to think that the sun revolved around the earth, rising in the east and setting in the west, day after day, year after year.

He never imagined that what was truly moving was not the sun, but himself.

"The Earth is still rotating on its own axis." Qin Tian's voice interrupted his thoughts, and the Earth model began to slowly rotate around its virtual axis. "One rotation is one day. The side facing the sun is daytime, and the side facing away from the sun is nighttime. The Earth is constantly rotating, which is why there is sunrise and sunset, and day and night."

Ying Zheng's gaze fell on the Earth model.

The small, azure ball was slowly rotating, one half illuminated by the sun, emitting a bright light, while the other half was immersed in darkness and almost invisible.

As the rotation continues, the land in darkness slowly turns towards the sun and is illuminated by sunlight, while the half that was once illuminated slowly sinks into darkness.

Sunrise and sunset, day and night.

That's how it came about.

It's not that the sun rises in the east and sets in the west, but rather that the earth itself rotates, bringing different places to and away from the sun.

Ying Zheng closed his eyes and simulated the scene in his mind.

He stood on the earth, which was spinning, while the sun remained motionless in the void.

When he turned his side toward the sun, he saw the sun rise from the eastern horizon.

When his side turned away from the sun, he saw the sun set below the western horizon.

He was turning around.

He kept turning.

He never stopped, and he never felt himself spinning.

Meng Yi stood to the side, his mouth slightly open, his eyes wide open, completely motionless as if he had been frozen in place.

His mind was racing, trying to process every word the Grand Preceptor had just said.

The Earth is a sphere, the Moon is a sphere, and the Sun is a sphere.

The Earth revolves around the Sun, and the Moon revolves around the Earth.

The sun is 150 million miles away from the earth.

One rotation of the Earth on its axis takes one day, and one revolution around the Sun takes one year.

Meng Yi felt that everything he had learned, all the principles he knew, and all the common sense he believed in had been swept away by a gust of wind, leaving nothing behind, in the face of these few short sentences.

But he couldn't say anything in rebuttal.

Because the Imperial Advisor had led them on a flight of tens of thousands of miles yesterday, allowing them to see firsthand lands and seas they had never seen before.

Facts speak louder than words.

What you see with your own eyes, hear with your own ears, and feel with your own body is more real than any book's explanation or any knowledge passed down by word of mouth.

The scene above Qin Tian's palm began to change again.

The sun began to shrink, shrink, and shrink again.

From a large fireball, it shrank to a point of light; from a point of light, it shrank to a tiny dot; from a tiny dot, it shrank to an almost invisible speck of dust.

At the same time, more spheres appeared around the sun, of various sizes and colors. Some rotated rapidly near the sun, while others rotated slowly away from it.

Ying Zheng held his breath.

The once enormous sun had now become a tiny, insignificant point of light in his field of vision.

If the previous sun model was a watermelon, then the current sun model is a sesame seed—no, even smaller than a sesame seed, so small that it's almost invisible.

And those spheres revolving around the sun are silently rotating in an unchanging way since time immemorial.

"This is the solar system."

"The sun is at the center, with eight major planets, and countless dwarf planets, asteroids, and comets revolving around it."

He lightly tapped his finger in the void, and each planet he touched would light up slightly, emitting a slightly larger light than before.

"The planets closest to the sun are Mercury, then Venus, then Earth (the one we live on), and then Mars. These four are called terrestrial planets, which are planets similar to Earth, made of rock and metal, with solid surfaces."

"Outside Mars is the asteroid belt, filled with countless rocks of all sizes orbiting the sun."

"Beyond the asteroid belt is Jupiter. Jupiter is the largest planet in the solar system, larger than all the other planets combined. It has no solid surface; it is a giant sphere made of gas."

"Then there is Saturn. Saturn's most distinctive feature is its beautiful rings, which are composed of countless tiny ice particles and dust. From a distance, they look like a ring surrounding Saturn."

"Then there's Uranus, and then Neptune. These two are extremely far from the sun, dozens of times farther than the distance between Earth and the sun, and they are extremely cold."

Ying Zheng's gaze swept over the eight planets one by one, from Mercury, the closest planet, to Neptune, the farthest planet, and then back to Mercury from Neptune, memorizing their positions, sizes, colors, and characteristics.

The solar system.

The sun is at the center, and eight planets revolve around it. Each planet has its own orbit, its own speed, and its own characteristics.

They attract each other, yet stay away from each other; they each go their own way, yet do not interfere with each other.

For hundreds of millions of years, they have been rotating like this, never stopping, never changing.

And he, Ying Zheng, stood on the third planet among the eight planets, gazing up at the starry sky, believing that the heavens were flat and the earth was square, that the sun revolved around the earth, that he was the center of the world, and that the Qin Dynasty was the whole world.

It's so ridiculous.

Qin Tian's voice continued to echo in the hall, unhurried and slow, as if he were telling a story that would never end.

The picture of the solar system slowly unfolded in his palm, with the eight planets orbiting in their respective orbits, the asteroid belt twinkling between Mars and Jupiter, and in the distance, there was a vast unknown territory that humanity had not yet reached.

Ying Zheng's gaze fell on that almost invisible blue planet, a planet with the mountains, rivers, plains and oceans he had flown over yesterday, the vast land he had fought for his entire life, the people he deeply loved, and the empire he had built with all his might, the Great Qin Empire.

All of this is nothing more than a tiny, insignificant piece of land on a small, insignificant planet.

The Imperial Advisor is right, the world is indeed vast.

Ying Zheng thought he had unified the world, but he didn't even know he lived on a planet.

He thought his achievements surpassed those of the Three Sovereigns and Five Emperors, yet he didn't even know that the sphere revolves around the sun.

He thought that the Qin Dynasty was the center of the world, but he didn't even know that this planet was just a small, insignificant planet in the solar system.

But so what?

He didn't know before, but now he does.