There is no straight road from Xiazhou to Lanzhou, but the road is not bad. Ten days later, Li Yuanxing arrived in Lanzhou. But instead of entering the city, he went directly to the west, and after walking ten kilometers, he began to turn south. Heading in the direction of River State.

The Lanzhou garrison followed the team with 2,000 soldiers and horses, and informed all the troops in Lanzhou to enter a state of alert and be ready to fight at any time.

Hezhou is an important frontier town, a small branch of the Silk Road.

But Hezhou is less than twenty miles away from Tuyuhun.

"Report, Tang Qin Wang Banner, Tang Qin King Banner!" A small colonel stumbled all the way into the tent of the chief general of the defenders of Tuyuhun Dagu Mountain.

"What are you talking about" Mamoru Otani didn't understand.

"Datang, the King of Qin of the Tang Dynasty, that King of Qin has arrived in Hezhou." The messenger has already been at odds.

King Qin of the Tang Dynasty!

With or without troops, he alone was able to bring enough pressure to the surrounding states. The unpredictable art of war is one of them, as long as the King of Tang Qin is on the battlefield, the combat power of the Tang soldiers will be at least doubled.

"Come on, prepare a generous gift. Hurry to Doma City to report to His Royal Highness the Third Prince. ”

Taking a deep breath, the general of Dagu Mountain tried to calm himself down, no matter what His Royal Highness King Qin of the Tang Dynasty was doing here, Tuyuhun couldn't be taken lightly, his status was too low. If you want to go to visit, you must also go to the royal family in person, first send someone to send a gift to show goodwill, and see how you react.

Li Yuanxing: What will he do?

Holding a map, he was standing in a daze on a wasteland.

Li Lanshan told Li Yuanxing that the location was between Liujiaxia and Bingling Temple. And the detailed distance is given.

"Giving the distance a fart. Do you still have to take a ruler and measure it here? At one point, the error was a few kilometers here. Li Yuanxing scolded, and then looked at the latitude and longitude measuring instrument in his hand, not to mention that this thing is military, even if it is used by the gods, it is impossible to make automatic reservations without GPS.

Li Yuanxing looked around, and in more than a thousand years, the terrain would definitely change.

These mountains and valleys don't seem to be much different.

"Li Yuanchang, take the abacus. Bring a few people and get ready. I still remember that Gorou on the road taught you how to calculate that function. Now is the time to use it! ”

What is Li Yuanxing going to do. Nobody knows.

The guards were all guarding in a circle, Cui Yingying and the others were in the shed a few hundred meters away. In the shed in front of him, Li Yuanchang and a few people who are skilled in arithmetic have already set up haodejiashi to prepare.

Li Yuanxing first placed a disc on the ground, which was carefully made before departure, and the disc was spliced together. The diameter reached eight meters. The scale used on it is also calculated in centimeters of later generations.

Several craftsmen use hanging ropes to tie pillars on the ground. Then adjust the level of the disc.

Zuihou also used the principle of the sling to erect a pillar on the disc.

There is no GPS. Li Yuanxing had no choice but to use manual methods to calculate the latitude and longitude, and the error of 10 kilometers was too terrible. But if it's within a thousand meters, or a hundred meters. Li Yuanxing will definitely feel at ease.

The craftsmen were not slow, and it was finally completed by noon.

Li Yuanxing never left the disc, ate two meat buns for lunch, and drank a few sips of tea.

"Report, the pole length is the same as the shadow length!" A man standing on a disc watching the scale shouted. Li Yuanchang and several of his arithmetic immediately became nervous, and the movements were almost the same, everyone put the abacus in front of them, opened the blank paper, and then took the hard pen. Then open the correction value table given by Li Yuanxing and press it with an iron bar, waiting for the next value to appear.

Next to it is an ancient timekeeping day.

Li Yuanxing looked at the benchmark with his eyes, and also entered the value on the theodolite in his hand.

The person who reported the number quickly cleared the stopwatch given to him by Li Yuanxing and started the timer.

Half an hour later, he reported again: "Report, shadow ......"

Li Yuanxing used the time and place of the later generations. However, he also played a small trick, but the Tang Dynasty is based on the middle of the palace of the new palace in Chang'an City as the origin of longitude, and it is very, very easy to convert these two, and only a small program can be added to the computer in later generations.

Li Yuanxing calculated the latitude and longitude of later generations.

Li Yuanchang and others calculated the latitude and longitude of the Tang Dynasty.

Take the zero point of Chang'an as zero degrees.

After three measurements, the machine in Li Yuanxing's hand roughly calculated the latitude and longitude where Li Yuanxing is now. But there are also errors.

Li Yuanxing used the electronic compass on the machine to point in a direction, and Li Yuanxing drew a straight line on the ground.

"Someone, show me twelve miles and three hundred steps." Li Yuanxing ordered.

Li Yuanchang said at this time: "In the direction pointed by Sinan, the direction of the fifth brother is good. It's just that it should be longer, thirteen miles and six hundred steps! ”

Li Yuanchang was nervous and sweaty when he calculated.

After checking the data with several other people, he determined a distance, at least very close to the position that Li Yuanxing had made. As for Li Yuanxing, he was not surprised that he was just standing and did not use an abacus. The fifth brother is a star monarch, if he doesn't even have this ability, he won't be a star monarch.

But Li Yuanchang is young after all.

He wanted to prove that he was talented and good enough, so he offered to go a little further.

Li Yuanxing nodded with a smile: "According to what Qilang said, build a new platform there, and test it again at noon tomorrow." ”

"Yes!" Li Yuanchang was very excited.

Li Yuanxing went back to the tent to rest. Jindeman came to Li Yuanchang's side: "Fortunately, you are the royal King of Han, were you doubting His Royal Highness King Qin's calculations just now?" Or do you think you are more clever than His Royal Highness King Qin? I understand something about today, His Royal Highness King Qin is just teaching you how to calculate. ”

Li Yuanchang was also taken aback, he understood what Jindeman meant, and rushed to get out in front of King Qin. That's disrespectful.

However, after thinking about it, Li Yuanchang was not afraid: "Fifth brother is benevolent, don't care about such a trivial matter!" ”

"Do you know what this calculation is for?" Kindman asked again.

"This calculation? The fifth brother gave a value and a method of calculation. Just say you want to find this place? "Li Yuanchang has never been involved in politics, and what he knows most is calligraphy and painting.

Jindeman smiled indifferently: "If there are many people in Datang who are proficient in this kind of calculation, the military map of Datang will be accurate to within ten steps, and the convenience of the generals' battles, you will know as soon as you ask those generals." ”

When Li Yuanchang heard this, he ran to Lu Maofeng.

After asking, Lu Maofeng said: "This calculation is extremely troublesome. But if you don't think about being so accurate, just set up a pole and measure the length with a rope. The route of the field march does not need a guide, and the assembly of several troops can be graded with precision. ”

Lu Mao Fengxin said that His Royal Highness King Qin was looking for a position within ten steps.

It is possible to march to fight, and it is already extremely accurate within ten miles.

The next day, it was still the same, and the position was measured on the disk. Li Yuanxing didn't know that Li Yuanchang miscalculated, because there must be some errors in the transformation of latitude and longitude between modern times and the Tang Dynasty. It's only a few hundred meters, which already makes Li Yuanxing very happy. In the future, Li Yuanchang may be the first director of the Map Bureau in Datang.

Another few hours of busyness. Only this time, Li Yuanxing is more watching, and the main work is led by Li Yuanchang.

Li Yuanxing looked at the machine in his hand, and then looked at Li Yuanchang who was comparing angles to Sinan.

"Fifth brother, two hundred steps to the southeast. It should be almost to the location that the fifth brother said, we are not wrong in our calculations, but the angle of this Sinan does not seem to be accurate. It's a pity that none of them can be accurate to one thousandth. This is a little bit worse, ten miles away, half a mile away! ”

Li Yuanxing was very satisfied with Li Yuanchang's statement.

Originally, Li Yuanxing still thought that it would take ten days and half a month to find the location, but now he is underestimating the Liliang of the Tang Dynasty sergeant, opening mountains and paving roads, there is no place that Li Yuanxing can't reach. It's just that Li Yuanxing's gorgeous carriage was left in Hezhou City, and the car was too big to enter the mountains and valleys.

On the third day, Li Yuanchang led people to continue to measure.

Yan Shigu then asked, "Your Highness, what are you looking for?" ”

"Look for bones!" Li Yuanxing turned his head with a smile, and Yan Shigu shook his head: "The old minister doesn't believe it, His Royal Highness is moving the people." Moreover, it is only a few dozen miles away from Tuyuhun, and His Royal Highness has come here to really look for bones. What kind of bones deserve His Highness to come here in person? ”

"Wait and see, you'll understand." Li Yuanxing still didn't say it explicitly, because he didn't know if he could dig it out.

Cui Yingying was also curious, he asked, but Li Yuanxing just didn't say.

"Fifth brother, eight hundred meters further east, is the location that Fifth Brother said." Li Yuanchang ran over excitedly, Li Yuanxing looked at the instrument in his hand, and the calculated position was about the same, and it could be said that the error was within one kilometer.

Li Yuanxing took a deep breath: "Lu Maofeng, give the order." ”

"In!" Lu Maofeng shouted, and all the people around, whether it was a general, a captain, a sergeant, or a craftsman servant, straightened their bodies and ran so far, they didn't know what His Royal Highness King Qin was going to do, and finally waited for His Royal Highness King Qin's order, how could this not make people excited.

"The cavalry guards the perimeter, and no one within thirty miles is allowed to approach. Yulinwei guards the inner circle, and trespassers are killed. All soldiers and auxiliaries except for necessary food and medical care. Take off your armor and start digging. No one is allowed to use the detonator without the permission of the king, and all work must be done by hand. If you see a bone, or something like a bone, you must report it to the king immediately, and remember not to damage any bone! ”

Bones, digging bones? What kind of bones are dug up?

Everyone was stunned, they had traveled thousands of miles and spent so much effort to dig bones.

It can be said that if Li Yuanxing hadn't personally ordered it, I'm afraid that some officers would have come to ask the reason. (To be continued......)