Together, Harrov and Lynn pulled the string straight, pressing one end under the icicle and the other overlapping the shadow.

When the magic clock reached twelve o'clock, Harrov used his hand as a knife to cut the remaining ropes with great precision!

"Scale, get the scale!" Harrov shouted excitedly, and he was so anxious to come down that he forgot to bring the most important ruler.

The quick-eyed Elok immediately ran back to the airship, and within ten seconds he handed the scale to Harrov.

The legendary wizard solemnly took the scale and began to measure it in sections as if on a pilgrimage.

"Lord Harrov, what is the length of the shadow!" Several wizards who accompanied him asked with great anticipation.

Harrov did not answer immediately, but measured it several times before speaking in a cautious voice. "It's 1,0051 centimeters, that's 10.51 meters!"

The people who got the data immediately took out a pen and paper and calculated it, and the great wizards who were qualified to take the airship to watch this experiment in person, although they had not systematically studied the Olympiad, but the operation method of basic geometry was still clear.

However, this value is not a positive integer, in the case of decimals, the square is then squared, and the amount of calculation is multiplied, and it took more than five minutes to calculate the length of the hypotenuse with the Pythagorean theorem is about 100.55 meters.

After more than two months of Olympiad training, Lydia and Elok are obviously faster than them, and have begun to calculate the angle of the apex, substituting the triangle formula, sine is equal to the opposite side than the hypotenuse......

"I figured it out, the top angle is six degrees!" Lydia, who was the first to count, waved her arms vigorously and shouted loudly.

Harrov, who didn't hold a pen and paper, got the answer at the same moment with mental arithmetic - Lydia was not wrong, the top angle of the triangle and the corresponding angle between the center of the earth were six degrees!

The rest is easy to do, a circle has 360 degrees, and the angle between the center of the earth is equivalent to dividing the whole circle into 60 equal parts, each equal division is 720 kilometers, then the total length is ......

"Forty-three thousand two hundred kilometers!" Harrov's voice was trembling, and he counted several times in his mind in a row, for fear of negligence, and after confirming the accuracy, he said as if in a dream. "Forty-three thousand two hundred kilometers! This is the circumference of the planet beneath our feet! ”

Lynn is naturally the fastest one, and after getting the shadow length data, the brain directly presents the answer in his mind.

It seems that this alien planet is slightly larger than the Earth in the previous life.

If he remembered correctly, the circumference of the earth should be 40,000 and 75 kilometers, and the data of the two is very close.

The rest of the wizards also quickly calculated this value, and they couldn't help themselves with excitement, once they knew the perimeter, it was only a matter of time to calculate the diameter, radius, and area.

Rohr on the side did not participate in the calculation, but created a new picture scroll again, called "People who measure the circumference of the planet under the interweaving of the sun and ice]!

The ink-stained quill swung rapidly across the parchment.

Haroff measuring the rope with a scale, Lynn gazing at the sky as if estimating the angle between the earth's core, Lydia leaping high, and the wizards who are thinking behind them, all leap onto the paper, and the scorching sun and floating Iceland against the backdrop, forming a strange and harmonious picture.

After squandering his inspiration, Rohr looked at the two paintings in his hand and felt that he had no regrets in this life!

Because he knows very well that these two pictures will inevitably be remembered by the world forever with this historic moment!

However, after sorting out his emotions, Rohr did not forget another serious matter, otherwise some people would not have been able to wait.

Thinking of this, Rohr looked at Haroff and asked. "Lord Harrov, do you want to send this news to Greenriel now?"

Harrov, who was calculating the surface area of the planet, didn't bother at all, just nodded casually. "Since it's confirmed, let's send it!"

……

At the same time, in Greenriel City, more than a dozen alchemists were guarding in front of the alchemy formation of communication, anxiously waiting for the message on the other side.

But it was already 12:37, and there was still no news, which made Raphael and the others have to wonder if the operation had failed.

Could it be that Lynn's assumption was actually wrong, and the continent was not a spherical shape?

"Look, there's movement!" A sharp-eyed alchemist immediately noticed that the formation was lit up, and everyone immediately rushed up.

Since it was more than 700 kilometers away, the magic stones needed to transmit information were also a terrifying number, so Luo Er only transmitted the two most important data, the shadow length and the top angle.

"The shadow length is 10.51 meters, and the top angle is 6 degrees...... Raphael shouted excitedly as he looked at the data made of magic power that was constantly beating in the alchemy circle.

With the help of amplification magic, the news soon spread throughout Greenriel City, and a strange scene appeared in the entire wizarding city, and countless anticipating wizards took out parchment and quill at the same time and began to calculate, and even many well-educated civilians participated.

If you only have a shadow length, you must be proficient in trigonometric functions to calculate the data, which is enough to stump most wizards.

But once you know the data of the top angle, it becomes the most basic multiplication and division, and even some civilians can calculate it!

"The circumference of the planet is 43,200 kilometers, the diameter is about 1,751 kilometers, and the surface area is 594 million square kilometers?" On the crowded streets of Greenriel City, Ali looked at the data he had just calculated and muttered to himself.

He wasn't a wizard, or because of his talent, he didn't even have the opportunity to become a wizard apprentice in a magical school, but he had a strong interest in counting.

Before, Yali thought that counting could only be used for daily transactions, and it was great to become a tax officer, but the last issue of [Magic Daily] opened the door to a new world for him!

The wizard named Lynn from the Misty Frontier had planned to measure the circumference of the planet beneath their feet, and it didn't require any magic, just a few simple calculations!

Yali didn't believe that it would be so easy, but when these values really jumped on the paper, there were no doubts in his heart, and the shock was difficult to subside, and the world seemed to be his!