"The second point is the interference of the gravity of other planets. Even if the planet under our feet has an initial orbit close to a perfect circle, it will inevitably deviate after tens of millions of years of evolution due to the interference of the gravity of other celestial bodies," Lin En explained.

"So that's it!" Harov suddenly realized that gravity exists between all things and will inevitably interfere with each other. Even if the amplitude of this interference is very small, under the effect of time on the scale of tens of millions of years, it will be magnified to the point where it affects the orbit of celestial bodies.

There is a third influence that Lynn did not mention, which is that the stars themselves are not stationary, they are also moving around the center of the galaxy, so interference is inevitable.

However, this is probably beyond the understanding of these wizards. They haven't even figured out the rotation of planets, and they know nothing about the larger picture of the universe.

"I have another question. The first law says that the star is at a focus of the ellipse. What is this focus?" Harov continued to ask.

"It may not be convenient to explain it directly. Why don't you just draw an ellipse and you will know?" Lin En said with a smile.

Harof stretched out his hand without hesitation, using his right index finger as a pen and magic power as ink to draw an ellipse in the air, and then looked at Lin En, waiting for his answer.

Damn, he drew an ellipse freehand and it’s so standard.

The corners of Lin En's mouth twitched. He finally understood why the "technology tree" of the wizard land was so messed up. This was because wizards had no use for many instruments at all. When encountering a problem, they would probably only consider which kind of magic would be more convenient to solve.

Seeing this, Lin En, who was at a loss whether to laugh or cry, could only turn around and look at the apprentices.

"Alok, you should draw it!"

Alok nodded excitedly. He knew how to draw an oval, and this was a chance to show up in front of the legendary wizard. Alok trotted and quickly found two small wooden sticks and a thin rope. Then he put the thin rope on the two sticks inserted into the ground and used them as a fulcrum. He used a feather pen to hold the thin rope and draw a circle around the two small wooden sticks.

An ellipse immediately appeared in front of Harov.

"The positions of these two sticks are the foci of this ellipse. What's special about them is that the sum of the distances from any point on the arc to the two foci is the same. Some scholars in the [Secret Society] even believe that a perfect circle is actually an ellipse with two foci at the same position..."

Through the process of drawing a circle, Lynn explained to Harov the meaning of an ellipse and the derivation of Kepler's three laws.

Harov was fascinated by the lecture and couldn't stop clapping his hands in admiration. "It's wonderful! It's really wonderful! I didn't expect that the movement of stars can be reproduced so intuitively and clearly through Mathematical Olympiad..."

"If you had stayed a little longer last night, I wouldn't have spent most of the day using the most primitive method to verify the three laws." Harof said with emotion. The conclusion he had drawn after spending a whole night was now perfectly summarized by Lin En in just a few short sentences and some Olympiad formulas.

"Lord Harrov, Professor Lin wanted to visit you in person last night, but was stopped outside the door." Philip on the side said hurriedly.

"Ms. Theresa thinks your research has reached a critical point, but I'm afraid you won't be able to find the time for this meeting." Lin En shook his head and said, "I told her that these laws and formulas should be helpful for your research, but this lady seems to have some small prejudices against me."

Harov's face immediately turned ugly. This was not how Theresa explained it to him in the manor before! After Lin En pointed out the other party's problem, he did not continue to accuse Theresa of offense. A witch who could not see the situation clearly was not worth his deliberate remarks. One or two words were enough.

"Before coming to the wizard land, an adult from the [Mystic Society] entrusted me to give this ring to a very wise and learned person to discuss the mysteries of the universe, time and space. The next meeting time should be around twelve o'clock tonight." Lin En said as he took out an exquisite ring.

That was exactly the [Ring of the Faceless Man] that he had recast, but compared to before, the appearance of the ring had changed a lot. The most obvious thing was that the blooming flower of thorns on the ring face had turned into a very strange geometric pattern.

The outer circle is a round clock, and the inside is a pyramid-like pattern. In the center of the pyramid there is a striking, strange eye constructed with geometric patterns.

That was the Eye of All-Seeing! Although he and Teresa, the other party's apprentice, had an unpleasant quarrel in front of the manor before, Harov was able to put aside his pride and ask various questions to this three-ring wizard without any scruples. After considering it, Lin En handed over the only signal transmitter he had made.

Harof solemnly reached out to take it, and after carefully examining the alchemical patterns on the ring, he quickly determined that the function of this thing was to project one's own magic power to a certain place.

This method was not very novel, but as it was his first contact with the [Society of Secret Arts], Harof was still very concerned about it.

In his opinion, Lin En was like a representative sent by the [Society of Mysticism] to contact the Land of Wizards, and this gathering should be a formal contact between the top leaders of both sides to discuss cooperation or exchange some more profound magical issues.

After getting the ring, Harof did not stay long and soon said goodbye and left. He had to go back and think carefully about what knowledge could be used as bargaining chips.

It was only after Harov left that Lin En asked in his mind.

'071, are you sure that the magic field is safe enough? There is no possibility that it can be taken away by others?'

Lin En did not forget that this thing was taken from Hellram. Normally, he was not worried. After all, the computing power of the intelligent computer was very strong. But he was not so sure when facing a legendary wizard.

[The original form of magic power transmission and reception was too simple, and has now been replaced with quantum encryption. Theoretically, there is no possibility of being cracked. ]

Lin En then nodded with relief.

(End of this chapter)