The sticks stood in the dirt, and their shadows fell straight to the ground.

Bi Fang marks the location of the shadows in the dirt, and his movements are gentle and delicate, like a master repairing clocks in an alley, using tweezers to clamp parts and assemble them little by little.

If it weren't for the previous words, some people might really think that Bi Fang was engaged in some kind of clock repair.

[Measure the latitude and longitude, no, no, no one really expects the stick to measure the latitude and longitude? 】

[A wooden stick to measure latitude and longitude? Fang Shenmo wasn't joking? 】

[Lying at home, I quickly clicked on the GPS and looked at it, scared to death, fortunately it was not me who lost contact ()]

[Can the latitude and longitude be measured directly? If it can be measured, our Shijie will stand upside down on the spot, and then eat it! 】

[Don't cheat on eating and drinking, why don't you show everyone a toothpick to pick a lock? ] 】

Not only are new viewers unconvinced, but even many old fans are skeptical.

"Fake, right? How is it possible to measure latitude and longitude with a single stick? The current anchor deceives people and has to talk about the Basic Law, right? On the subway, a man hung a ring and couldn't help but make a sound.

The subway was crowded, he stood here for a long time, and stumbled upon the two little girls in front of him watching the live broadcast, so he glanced at it curiously, and saw this scene.

On the mobile phone, a man who was a little more handsome than when he was young blew it out, then stuck a wooden stick on the ground, and made two marks casually, saying that he would rely on this to measure the latitude and longitude.

There is no way to deceive people, how to break it?

It's not a little girl who has not been out of society to believe it, she looks very beautiful, why don't you have a brain?

Yang Ziyan glanced back at the man who looked like an office worker slandering his idol, can this be endured? immediately retorted: "How is it impossible, if you can't do it, it doesn't mean that Fang Shen can't do it either, he is the world's number one survival master!" ”

"Fang Shen? A master of survival? Still the first in the world? laughed off the big teeth, not to mention the title of scum, who won the title of the world's first? Is there a competition? The man was dismissive.

He pointed to Yang Ziyan and her classmates: "You little girls, you don't know how to go to school well, you know how to chase stars and Internet celebrities all day long, in fact, these celebrity girls have to die, and they are even more useless, this is a little handsome, but it's the same, it's better to read two more books to enrich yourself." ”

As soon as Yang Ziyan wanted to refute, the classmates on the side had already taken the lead: "Uncle, do you never watch the news?" So self-righteous? My grandfather will watch the news on the Internet, and no one will even read the news, right? Wouldn't it, wouldn't it? ”

The man who was pierced in the center by an uncle muffled a mouthful of old blood.

"Oh, I see, it must be that the uncle is under too much pressure to work overtime, the boss is very fierce, there is no hope for promotion, and the wife with someone and the daughter is in early love, so there is no time to surf the Internet! Hey, it's so miserable, Yanyan, let's go, don't be with him, decay will be contagious! ”

The classmate spoke as fast as a bullet, and then pulled Yang Ziyan to squeeze through the crowd and go elsewhere, leaving only the stunned office workers.

Yang Ziyan on the side silently gave a thumbs up.

But even if the two ran away, the man could still faintly hear what they were saying.

"I'm really angry, when Fang Shen was fighting the wolves, this guy didn't know which horn he was constipated in."

"Okay, okay, since he's so miserable, we have to weigh it too." Yang Ziyan covered her mouth and snickered.

Vozh.

This uncle can endure it, but aunt can't bear it either.

The man who was poked in the sore spot was so angry that he couldn't swallow this breath at all, but just now he saw the name of the live broadcast room!

The man took out his mobile phone, downloaded a wolf tooth APP, and saw Bi Fang's live broadcast at first glance.

He didn't believe it, no one could see this kind of deceptive routine?

No, he's really more energetic today, and if he can't dismantle the other party, he won't get off this subway!

"Latitude and longitude calculations are actually not difficult, there are three factors: the shadow of the sun, the direction and the date. Don't think it's inconceivable, I'm not relying on sticks, I'm relying on the sun. ”

Bi Fang stretched out his hand and pointed to the sun hanging high in the sky, the weather was very good today, the sun rose above the clouds, and the sun was spreading down against the clouds, casting the shadows of the trees on the earth.

"From a phenomenological point of view, we can think of the ground as a plane and the sky as a sphere, which is called the celestial sphere. The Sun follows a circular trajectory on the celestial sphere, rising in the east and setting in the west. ”

"Not only the sun, but all the celestial bodies, the moon and the stars, are all on this celestial sphere, rising in the east and setting in the west, as if they were rotating around an axis. This axis is the axis of rotation of the earth. ”

"The position on the celestial sphere to which this axis points is the north and south celestial poles, and we confirm our position on the plane of the earth by the positioning of these celestial bodies."

Bi Fang explained the principle a little, continued to practice, and marked along the shadow just now.

"First of all, we have to erect a pole on the horizontal ground, remember, we must try to be as horizontal as possible, so that the measured data is accurate, and then constantly draw its shadow, when the shadow is the shortest, record the direction of the shadow at this time, which is due north."

"After measuring the length of the shadow and the pole at this time, using trigonometric functions to calculate the elevation angle of the sun, and then considering the number of dates to measure the distance between the spring and autumn equinoxes and the summer and winter solstice, the day I set off is the 21st, then today is the 22nd, and then use trigonometric interpolation to calculate the latitude of the direct point of the sun on that day, and then the local latitude value can be obtained after addition."

"In addition, after obtaining the direction of due north, record the time when the sun passes due south, because the time of the capital is the time of 120 degrees east longitude, and the longitude can be obtained by using the time difference between the recorded time and the 12 o'clock."

"But this method is complex to calculate, and it may not be suitable for everyone, isn't there a saying that you can't do math problems, you can only write a solution."

[My grass, what is this, why can't I understand?] 】

[You can't do political questions, you can write scribbles, you can't write English compositions, you can copy and read comprehension, you can't do math problems, you can only write a solution.] 】

【Algebraist】

[I didn't expect it, I'm all in the wilderness, and I still have to do math problems? 】

When many viewers heard that series of explanations, they suddenly broke down.

Bi Fang on the side began to observe the shadow of the sun, but fortunately, the shadow was shortening, the time was only close to noon, and he did not miss the shortest point, if he missed it, then Bi Fang could only wait for the evening to measure the latitude and longitude with the help of the North Star.

Ten minutes passed, and in the chat between Bi Fang and the audience, the shadow finally came to the shortest point and began to extend.

Bi Fang hurriedly marked the mark and began to list the formula with a tree branch on the dirt beside him, when a few blank pieces of paper and pencil suddenly came to him.

Bi Fang subconsciously took the pen and paper, and was stunned when he saw Etienne in front of him: "Where did you get this?" ”

Etienne scratched his head embarrassedly: "I brought my homework, and it was on the plane at the time, and there are still a few pieces of scratch paper left." ”

[Good guy, and homework? 】

[Niu Pi, don't forget to bring your homework when you run away, you are a good student at first glance]

Bi Fang was also confused by this operation, but with paper and pencil, it was a lot more convenient, and then he sat on the stone and wrote a series of formulas with a pencil that the sailors did not understand.

[It's over, if you don't know math, won't you be able to survive? 】

[This formula, I see that my head is big, and the old party is actually calculating the function by hand! ] 】

[I've never taken class so seriously, I'm really sorry for my math teacher.] 】

"Actually, it doesn't matter if you don't, the real wilderness survival rarely uses this method to confirm the latitude and longitude, but this mission is more special."

"And it really doesn't work, you can also wait for the evening, use the North Star to measure, in the wilderness, the stars are very clear, this method is also simpler, and when there is a chance at night, I will teach you."

Bi Fang buried himself in hard calculations, and from time to time he had to bite the head of the pen, many functions were not accurate without a calculator, and he could only find an approximate value to substitute, and the audience was dizzy in the process.

Just as Bi Fang calculated the answer, the paper went dark.

Strange, how did it get dark.

Etienne looked up.

Lead-colored clouds pushed in from the southeast, and the thick clouds gave a sense of foreboding.

Etienne suddenly remembered what Elwan had said, there would be a blizzard the day after tomorrow.

And now,

Blizzard is ahead of schedule!