At eight o'clock in the morning of May 12, the with Jin, Elsa, Reiko, Saki, Goose, Goh, Rubina, and Merze left Reuthert's compound.

"......"

"Goose still doesn't like heights."

Seated in the middle of the cabin, farthest from the window, Goose sits with his eyes closed.

"I'm not afraid of heights," he says, "even though I'm not afraid of heights on top of mountains.

"I'm fine as long as my ...... feet are on the ground. But I can't look down into the valley."

"Even here, your feet would be on the floor."

"...... that's not what I'm saying."

Jin, that's not what I'm talking about.

Saki seems to know a lot about goose.

...... that it's not about logic.

"Well, leave him alone for a while."

"......Yeah, okay."

So, pretending not to see Goose, Jin and the others decided to take in the view below.

The latitudes of Reuthert and the village of Kuent are almost the same. Therefore, the < is not flying toward the true east .......

"Oh, because Ars is a sphere!"

Rubina shouted, as if she knew what I was talking about.

"That's what I mean."

"I see."

"What do you mean?"

Goh seemed to understand, but Merce did not seem to understand.

Jin then took an Ars Electronica from the shelf.

"Here, take a look at this."

The latitude of Leusert is about 25 degrees north, so there is not much difference from the map drawn by the (fake) Mercator technique, but still, the straight line connecting the two points is different between the ars-globe and the flat map.

This is the actual straight line route. If you copy this to a flat map, you can see it at ......."

"So it's a curve."

If the distance between the two points were shorter, there would be little difference.

I understand.

"However, this map has the advantage of being able to place the east, west, north, south, and west in all four directions. ......"

Jin took this opportunity to teach Mertze the basics of maps and navigation.

* * * *

"Yes, Jin is probably more familiar with the engineering and magical enhancement of materials. You can ask me about the development of materials.

Meanwhile, Rubina was asking Saki many questions.

"There is no such thing as a material that can be used anywhere. First of all, it would be good to understand the physical properties of various materials so that you can use them in a way that makes the best use of their advantages.

"I see. ...... I'm learning a lot!"

"I see. I think it's important to use the material at least once and feel its properties firsthand.

Saki said, "You shouldn't think you know the properties of a material just by memorizing its data.

"It's common among geniuses. They think they know the properties of the material just by memorizing the data.

"......This hurts my ears a little."

"Data are only representative values. For example, a person's personality cannot be explained by words alone, can it?

"Yes, that is true."

Rubina, who had been listening to Saki's explanation, was now listening attentively.

Jin glanced at her while explaining to Merce, and thought it was a good thing for Rubina.

* * * * * * * * * * * * * *

Now, how is Goh doing?

Goh unusually asked Erza many questions.

The main one was about .

Actually, the other day when I was doing some tests at the workshop, I accidentally cut my finger, and when I told him that I had cast on myself, he scolded me.

"You can't use healing magic without cleansing the wound," he said.

He said.

I was given detailed reasons and first aid methods for this.

"You must wash the wound with clean water to prevent dirt and germs from getting into the wound, and then apply ."

"...... yes."

"The water is best served with water magic. It is sterile.

Okay.

Be careful when you have a serious injury. First of all, if the potassium in the cells is temporarily dissolved in the blood, it can lead to hyperkalemia, especially in the heart muscle.

"Do, what should I do?"

"If you don't have a cure, give them lots of water to drink."

This will dilute the potassium level in the blood and also allow it to be excreted in the urine, Elsa explained.

"So it is also useful to activate the organs with the therapeutic measure Heilfahren."

"It is beneficial."

"Yes. It is not always possible to get injured outside. So it's a good idea to know some first aid.

Yes.

"So, back to the case of the serious injury, the substance myoglobin can cause kidney failure, and lactic acid can cause lactic acidosis.

"That's scary."

"Yes. One of my brothers was in the military, so he was always exposed to these dangers.

Elsa reminded him that not only he, but also his subordinates and colleagues could be injured.

* * * * * * * * * * *

Meanwhile, the <> flies over the border between the kingdoms of Franz and Selroa, with Lake Asur in the far south.

The time difference from Leusert is about +3 hours. The distance is about 900 km.

< is flying at a speed of about 300 km/h, which means that it will take 3 hours to fly over.

That means the arrival time is .......

"Meltze, can you do the math?"

"Yes. The time difference is 3 hours, so 8:00 a.m. when we left Leuthart is 11:00 a.m. there. And since we arrive in 3 hours, we arrive at 14:00, that is, 2:00 p.m., right?

Correct.

"Correct." "Thank you very much."

It was a short lecture, but with practice, and Merce seemed to understand it quite well.

(The latitude is different, but the longitude is almost the same as that of the village of Kaina. ......)

(The longitude is almost the same as that of the village of Kaina, though the latitude is different from that of Kaina.

< would soon be over our destination.