Hogwarts Passer-By Professor

Yellow sand is everywhere on the plain, and those stone mausoleums are extraordinarily magnificent.

Standing on the top of the pyramid, Eisen could vaguely feel the magical aura coming from deeper into it, but standing on the top of the pyramid, the magical aura seemed to be isolated and no longer flowed out.

Looking up at the sky, the sky is cloudless, and the sun is shining directly down, making the temperature here rise rapidly. However, none of this can affect Eisen's actions.

With a thought, Eisen turned into light and rushed towards the sky.

Troposphere, stratosphere, mesosphere, warm layer, escape layer. Almost instantly, Eisen rushed out of the atmosphere and came into outer space.

Eisen who turned into light did not stop, but flew straight towards the moon.

There is silence in space, but for Eisen, it feels nothing. Because when he transformed into light, he fell into an extremely quiet situation.

Counting from the moment when Eisen flew up into the sky, to the moment when the moon landed on the back of the moon, it took less than two seconds in total.

Falling into a meteorite impact crater, Eisen regained his human form and stood on the ground.

Looking at the desolate and lonely moon, even though the moon is the closest satellite to the earth, Eisen still has an uncontrollable sense of loneliness.

There is no air on the moon to breathe, which is a big problem for Eisen. But as if the magic effect had been solidified on the body before, Eisen felt that he could hold his breath for a long time.

With a thought, put a bubble head spell on yourself. Eisen found it had no effect. But it's no wonder if you think about it, the effect of the bubble head spell is to isolate the unpleasant temperature in certain environments and provide sufficient oxygen underwater.

The reason why it can provide oxygen, whether it is underwater or other environments, is that there is oxygen. But there is no oxygen on the moon, so the bubble head curse is completely useless.

While there's plenty of time left to spend on the moon, Eisen has goals of his own, so time isn't wasted.

Using the power of time in his body, Eisen disappeared instantly.

On January 1, 1900, Eisen's figure appeared out of thin air in a crater on the far side of the moon.

Looking at the surrounding environment that still hasn't changed at all, Eisen knew that his time travel experiment on the moon was successful.

only--

If the time is different, the position of the moon should be different. Thinking of this, Eisen was also a little puzzled. After all, the Moon orbits the Earth all the time.

He returned from the moon at a certain moment in April 1994 to the moon on January 1, 1900, but the location did not change at all, which is very confusing.

Or does the frame of reference only refer to the place where he himself is?

After concentrating his thoughts, Eisen squatted down and drew a very obvious mark on the ground, and cast a firm spell on it to ensure that the mark could last for a long time.

After doing this action, Eisen didn't stop, and returned to modern times directly.

On the moon at a certain moment in April 1994, Eisen's figure suddenly appeared, as if he had never moved.

After appearing, Eisen squatted down and looked towards the place where the trace was drawn earlier. But it was found that there was no trace of it at all.

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Taking a look around the traces, the bumpy surface of the moon has not changed much from before. This shows that the surrounding area has not been changed by external forces in the past hundred years.

But the traces drawn by Eisen disappeared, and the traces protected by his spells disappeared.

What does this mean?

This shows that Eisen's changes to the past will automatically return to the original after he returns to the present! Or to put it more simply, it's like Eisen never made those changes in the past.

But how could such a thing happen? Eisen was puzzled by this.

Time passed by second by second, and when Eisen felt a little bored, he stopped thinking about it for the time being, and turned into light and rushed towards the earth.

A little over a second later, Eisen returned to Earth, and then an apparition disappeared, returning to his own office at Hogwarts.

After conjuring a reclining chair, Eisen lay down and gradually thought about what this experiment represented.

Since some changes in the past will be restored when he returns to the present, doesn't that mean that even if he wants to change history, there will be no problem returning to the present?

Do not--

Some previous experiments can only prove that some objects can be restored to their original state after returning to modern times after being changed. However, Eisen cannot guarantee the consequences of changes made to characters and real historical events.

It is possible that history will be corrected automatically without causing any changes, but it may also be changed beyond recognition.

Therefore, even knowing that changing an item in the past will not affect the future, Eisen still feels that he should be more cautious when traveling through time in the future.

However, if you really want to experiment, how to grasp one of the degrees is a problem.

Time passed bit by bit, and Eisen was immersed in his own thoughts.

Suddenly, Eisen seemed to think of something, stood up from the couch, restored it to its original state, and left Hogwarts in a flash.

Charing Cross Road, outside the doors of the Leaky Cauldron, the invisible Eisen appears out of thin air.

Appearing here, Eisen intends to time travel again.

Looking at the streets full of people coming and going, no one could see him, Eisen suddenly sighed. Thinking about it, he was also a member of the crowd before. Fortunately, he awakened Gold Finger to allow himself to see the real side of the world.

With a thought, Eisen's figure disappeared instantly.

On July 4, 1990, Eisen's figure appeared out of thin air at the door of the Leaky Cauldron. After appearing, Eisen didn't do anything extra, but hid his figure, retreated to the corner of the Leaky Cauldron near the bookstore and waited quietly.

People walk from one side of the street to the other, passing bookstores, record stores, burger joints, movie theaters, but just ignore the Leaky Cauldron next door.

Time passed slowly, and when it was past twelve o'clock, a figure looking left and right appeared in front of Eisen.

If nothing else, it was himself who had just resigned. That is, he who just activated Gold Finger and left Jade Forest Film and Television Company.

From the perspective of time, he just entered a coffee shop in the past, and he was still trying to create his own "Eight Nine Xuan Gong" and "Magic Body Refining Technique" in it.

Thinking of this, Eisen couldn't help but smile. Looking at his past self, Eisen couldn't help but feel as if he was in another world.

Although less than five years have passed, Eisen feels that a long, long time has passed.

The past self walked slowly, was attracted by the Leaky Cauldron Bar, stopped straight away, glanced back and forth, and then set his sights on the signboard of the Leaky Cauldron Bar.

Then, he seemed to think of something, and a shocked expression appeared on his face.

After a while, the past him went straight into the next bookstore. Eisen, who was hidden by the side, didn't move. Instead, he opened the God's perspective and saw himself talking with the bookstore owner in the bookstore.

A few minutes later, his old self emerged with a copy of the Encyclopedia Britannica. Before coming to the door of the Leaky Cauldron, he looked down at his attire, then smiled, opened the door and walked in.

Eisen, who was hiding at the side, nodded slightly, and was about to go in and try to change his whereabouts, but suddenly stopped.

Do you really want to make some changes for your past self? Eisen was still hesitant.

His previous time travel experiments showed that he actively changed the state of certain objects in the past, and those objects would return to the state before they were not changed after returning to modern times. As if Eisen hadn't made the change.

So, this time travelling, Eisen was going to do some intervention directly on his past self. However, the problem before Eisen is that if he is really interfered in the past, it may cause some consequences that he cannot bear.

Objects in the past have been changed without the slightest impact on the future, but he can't bet on interfering with his own deeds in the past, nor will it have the slightest impact on him in the future.

"Caution, prudence!" Eisen took a deep breath, remembering the "rules of conduct" he had previously defined.

Suddenly, Eisen figured it out. Since you want to conduct intervention experiments on people or historical events, you don't need to start with yourself. In fact, interfering in other people's lives can also achieve their goals.

Furthermore, even if you really want to interfere, you only need to pick a target and intervene very slightly. As long as there is a slight change in the life trajectory of the target in the future, it can prove that the intervention of people and historical events can change history.

If there is no change in the trajectory of the target's life in the future, then there is a slight intervention in progress. If still nothing changes.

It can be basically confirmed that whether Eisen changes the state of objects in the past or changes the development process of someone or something, history will not be changed.