"How far? Hehe, "Su Xing was amused, and now he found out that this Nie Peng really didn't count."

"It's enough to get from Jinan to Beijing." After speaking, he pointed to the value on the second page, where the driving distance was written 390KM.

"Are you kidding, I drove almost 400 kilometers in an hour?" Nie Peng picked up the paper from the table with a look of disbelief.

"Yes, it is estimated that no one will be able to break this speed record on the earth in half a century." Su Province teased, while taking out his driving path and said:

"The sense of direction is okay, at least for now, it is still heading towards the position of Chang'e-3, if you continue to maintain this speed, within two hours, you can almost reach it."

Su Xing said it very easily, but when Nie Peng thought of the scene on the vast wasteland, he suddenly felt a headache.

"Can't you get me some kind of positioning system?"

"You're my robot cat?" Su Province gave him a blank look, turned his head and put the recording module back. "What do you want? That's the moon, big brother! One has no magnetic field, two has no GPS, and three has no signal base station, where can you let me get you the positioning? "Once installed, I pulled the lid of the tank and poured a bucket of high-octane gasoline into it.

"But when I drove in that place, I really didn't know the bottom of my heart, it was like driving a ship on the sea. By the way, isn't there a sextant that measures latitude and longitude? Nie Peng remembered Schwarzenegger and Stallone starred in "The Golden Cicada Shells", and the tough guy uncle relied on the syringe, ruler, glasses and other messy things to make a simple version of the sextant and calculate his own latitude and longitude.

Su Xing heard him say the sextant, and the corners of his mouth curled helplessly.

"I just got you that thing, do you know how to use it?" After speaking, he looked at Nie Peng's forced look, and knew that this guy was purely whimsical.

"Not to mention that you need to stop the Hoverbike every time you use the sextant. Just say the formula for measuring latitude with a sextant and the steps for consulting the coordinates of celestial bodies at the equator, which will trouble you. "Tightening the fuel cap of the Hoverbike, Sioux began to check the propeller and motor again.

"What's more, even if it is measured, to tell you the truth, the accuracy will not be high. Compared to the astronomical observatory I made, it is far worse. You should drive in the direction of the earth with peace of mind, come back in half an hour, and rest with the inspection belt, and it won't take you a few times to find it. ”

Hearing him say this, Nie Peng also felt that it made sense, after all, it was not so easy to master an observation method, especially when he heard that he still needed to consult specific data, he felt even more headache.

So the best choice at the moment is to rely on the method that Su Province taught him before, use the earth as a reference, and when the earth leaves the sky in the upper right corner of his horizon, it will not be far from Chang'e-3.

"Hey, you've said so, then let's keep my head open, you can pretend to be one for me there, at least let me know how far I have gone." Nie Peng was still a little unwilling, and asked secondly.

"Odometer? It's okay, it's not very difficult, it's OK to find a Doppler speedometer to change it, so let's do it, you can estimate and open it for a while, thirty or forty minutes, and I'll install it for you when I come back. Su Province pondered for a moment and quickly gave an answer.

Hearing this, Nie Peng was no longer hypocritical, so he simply grabbed his helmet, put on his dustproof suit with the help of Jiaying, and sent it back to the moon.

The feeling of driving for the second time was naturally not as novel as before, but due to the previous experience, Nie Peng simply increased the speed to the maximum, and rushed for 40 minutes according to Su Province's suggestion before finding a relatively large Yueyan and stopped.

The rocks weren't very smooth, but they were much better than the dirt they had last landed.

When he returned to the lab again, he found that all three people in the room had arrived, watching the video projection of the celestial recording system he had recorded earlier.

"Nie Peng is back?" Di Zhexiao looked at Nie Peng, who appeared with the car, and walked over to pull him off the car, after experiencing several earth-moon gravity conversions, he deeply knew that it was not pleasant.

"Bring me a bottle of water." First thing after coming back.

With Di's father and Jiaying taking care of him here, he naturally didn't need Su Xing's help to do anything, so he directly removed the recording module this time and went to the engineering department to guide the data. After a while, he came back with a box of things.

"This time the deviation is a bit far," he said, pointing to the newly printed path, "maybe after the position of the earth has changed, the positioning by vision is a little inaccurate." ”

Nie Peng nodded and replied: "Yes, it's not as simple as aiming at the direction of the earth like before, just in the second half of the year, the earth was in the position above the head, and there was almost no sense of direction when driving." ”

"Well, we studied the video just now, found this problem, and thought of a solution, but now that you have a path, we need to recalibrate it, you have to wait for a while." Sioux connected the newly recorded video to the screen and mounted the adjusted speed disc on the Hoverbike while playing.

"What's the solution?" Nie Peng asked.

"Constellation positioning," Di Zhexiao answered, "When we just watched the video, we found that the reference value of the earth is far less than that of the constellation,"

"Meaning, let me judge by the position of the constellation?" Nie Peng suddenly felt that this idea was good, at least he had vaguely felt it during the ride just now.

"Yes, the principle of this planetary recorder is also designed according to the position of the constellation, but the accuracy is very high, we thought it could not be observed with the naked eye, but after watching the video, I think it is not a big problem."

"Okay, just so I'll rest for a while and drink saliva" Nie Peng was naturally relieved when he heard that there was a new way, otherwise the vast moon would be tantamount to finding a Jade Rabbit lunar rover that was not much bigger than a stroller.

Speaking of the Jade Rabbit, I have to talk about its appearance: the entire lunar rover is a rectangular box-like object, 1.5 meters long, 1 meter wide, and 1 meter high. The purpose is to reflect the strong light of the moon during the day, reduce the temperature difference between day and night, and at the same time block the radiation of various high-energy particles in the universe, and support and protect more than 10 sets of scientific exploration instruments such as infrared imaging spectrometer and laser dot matrix, which are the "secret weapons" in the belly of the lunar rover. It has two solar panels on its shoulders that can be opened, and six wheel-like mobile devices on its legs.

Overall, it looks like a miniature version of a truck bed.

Nie Peng combed through the appearance of the Jade Rabbit from his memory, and just when he was thinking about whether to find Chang'e-3 first and then do an expanded search, he was interrupted by Su Province.

"It's installed, and now you can see the speed and mileage."