"Eluok, it shouldn't be difficult for you to calculate the data of the planet under your feet now, right?" Lin En looked at several wizard apprentices and asked with a smile.

Alok and others nodded excitedly. Only then did they realize that what the professor said in the first class was not bragging. Mathematical Olympiad can really calculate anything!

Once you know the circumference of a planet, it's easy to calculate its radius, area, and even volume.

The wizards at the seminar were also somewhat unable to suppress their excitement. Now there were only ten days left until mid-July...

In other words, ten days later, the continent beneath their feet... no, it should be said that the entire picture of this planet, will be presented before them.

"I really don't know what's going on in your head. You can actually come up with such a strange method!" Raphael said with emotion.

Before Lynn's arrival, although there was no systematic arcane mathematics in the wizarding land, most wizards were still aware of the calculation methods of basic geometric figures. However, they had never thought that they could use such simple calculation methods to calculate the circumference of the planet under their feet.

Maybe this is genius...

Facing the praise from the crowd, Lin En remained very calm. After all, this method was not his own idea. He used the idea of ​​Eratosthenes, the former "Father of Geography", and just made some changes based on the conditions in the Wizarding Land.

In his previous life, when he was looking for historical data, Lin En was also amazed at the other party's genius thinking. This was simply using basic methods to solve the most complex problems! "Are there any requirements for the place where this pillar is placed?" Harov couldn't wait to verify this conjecture. If it weren't for the fact that there were still ten days until mid-July, he would have wanted to take action now.

"The ground should be as flat as possible, at least 500 kilometers away from Greenridge. For more accurate data, it's better to be more than 1,000 kilometers away!" Lin En said thoughtfully. "After all, the continent under our feet is too big. One scale may be tens or hundreds of kilometers. It's better to be as far away as possible. The pillars should also be as high as possible so that the shadow is clear enough."

So far... Harov's brows couldn't help but frown.

In this case, it may be impossible to verify it in the wizard land.

"There is a very suitable place. I heard that there is a tower hundreds of meters high outside the Sea of ​​Mist. This is a ready-made pillar." August suddenly suggested.

The wizards present were all a little surprised and wondered where August was talking about.

Philip, who was standing by, suddenly seemed to have thought of something, and said in surprise, "Master August, are you talking about the Sky Tower in the Holy City?"

Although he had never been to the Sekas Empire, he had heard from Herram and the sailors who traveled back and forth between the two places about some novel things beyond the Sea of ​​Mist, including this Sky Tower.

It is rumored that it is the place where the creator of life, the lord of stars, and the goddess of the moon [Ella] appeared. It is a holy place in the hearts of all believers.

Philip naturally scoffed at this so-called god, but he was also clear about the power of the Holy See. If they went to the Holy City specifically to measure the length of the shadow of the Sky Tower, it would be a death sentence. They would not even be able to enter the gate and would be caught and burned to death.

However, there were not many people as rational as Philip. Many young wizards even clamored to attack the Holy City directly.

After hundreds of years of development, they created countless novel magics, established a wizard promotion system and a magic theory system, which was powerful beyond imagination! The starry sky scene that Lin En told them made the wizards realize that the world was so big, but they were trapped in this small wizard land...

But Harov quickly poured cold water on him, saying, "We only have ten days. Even if we set out now, we may not be able to reach the Sky Tower at the fastest speed."

"And there's no need to make it so complicated. We can just use magic to create a floating ice island on the sea and erect an icicle on it. This way, the calculated data will be most accurate!"

The side of the Wizard Land facing the Sekas Empire is the Sea of ​​Fog, but this does not mean that the entire island is shrouded in fog. In fact, the sea behind is navigable.

But the sea is too vast. Once a great wizard wanted to see what was on the other side of the sea. After flying for a month, he only found some uninhabited islands and ferocious sea beasts, and he almost lost his way back.

Under Harov's decision, public opinion did not ultimately evolve to the point of invading the Sekas Empire and overthrowing the Holy See.

Although some wizards considered Harof's floating island plan to be a "cowardly" move out of fear of the Church, they did not dare to speak out against it. The focus of discussion soon shifted to how to determine the distance between the Corona Tower and the pillars.

A witch quickly suggested that they could find a very long rope, measure the length, and use it as a unit of length. Then, every time they traveled the distance of the rope, they would leave a mark on the ground as a mark. In the end, they would just have to count how many marks there were.

But this proposal was rejected shortly afterward because it was too troublesome, not to mention that the terrain of the wizarding land was uneven, which would result in large errors.

After a heated discussion, the more convenient method of measuring distance using carriages and ships quickly prevailed.

"How about using an airship?" Lydia suggested, raising her hand high.

Raphael and the others' eyes suddenly brightened. He was just about to say this, but Lydia brought it up first.

Compared to the alchemy ship that would be disturbed by wind and waves, the airship floating in the air is undoubtedly a better choice.

Not only can it overcome all obstacles and achieve true straight-line movement, but after being blessed with windproof magic, the sailing speed is also very stable and not prone to fluctuations.

If the airship is traveling at full speed, it can travel 15 kilometers per hour, so it can travel 360 kilometers per day at full speed. Using this as a benchmark to judge the distance is still very accurate...

Lin En did not join in the discussion. He turned to look at the wizards of the prophecy school and asked with a smile, "Mr. Yolande, do you have any questions now?"

Yolande was stunned and didn't reply, his mind was full of Lin En's method of dividing the circle into equal parts to calculate the circumference.

Although the exact result has not yet been obtained, he knows that the prophecy school has lost this time, and lost completely! (End of this chapter)