Chapter 164 I hope Beihai is fine
It was a sunny day just now, but in less than half an hour, lead-colored clouds pushed in from the southeast. They were as thick as a winter quilt and not even the sunlight could get through.
[This weather is so scary, is it going to snow? ]
[It seems so. I remember the professor said yesterday that it would snow the day after tomorrow, but it’s only the next day?]
[There are always errors in weather forecasts, right? ]
[Fang Shen, run quickly, or it will be too late! ]
When the netizens saw the cloud, they became anxious. They still remembered the power of the last blizzard. If they were trapped, not only would the gliders not be able to fly, but the geese might also be frozen to death.
Etienne nervously tugged at Bifang's robe.
"Boss, it's going to snow."
"Don't worry, it's no use."
Bifang naturally saw the clouds slowly drifting over, but he was not in a hurry. There was no point in being anxious. The more anxious he was, the harder it would be to figure out the answer.
"It will take some time for the clouds to come over. The most important thing for us is to find our current position and determine the direction before flying. Otherwise, the route may deviate further and further. If we run into a human city, the geese will remember it and it will be very dangerous."
"First, go pick up some charcoal, wrap it in soil and take it away. Then pour water on the pit to put out the fire. Remember to fill it with soil."
Hearing Bifang say this, Etienne could only endure it temporarily and act according to Bifang's instructions, but his shaking feet revealed his nervousness.
While Bifang was calculating, he was also explaining the method to the audience. He didn't seem panicked at all, but anyone with a discerning eye could still tell that he was recalculating a number.
I just calculated wrong.
"The degree of the sun's elevation is equal to arctan (stick height / shadow length), and then the latitude of the observation point is calculated = 90 - the degree of the sun's elevation + the degree of the sun's declination obtained from the ephemeris, and the latitude is calculated."
"In the future, when the weather is clear, we can observe and calculate the data repeatedly and find the average to improve the accuracy. If this method is calculated properly, the measurement accuracy error will be less than 1/3000, and the positioning accuracy error will not exceed 4 kilometers."
Bifang's hands moved noticeably faster, he spoke more and more quickly, the tip of his pen rustled, the numbers were almost connected, the lines looked like a rapidly growing dense forest.
The clouds were getting closer and closer, and everyone who saw them was sweating coldly.
The world has gone crazy, but some people are still doing math!
"There are two days in a year when the sun is used to measure the direction most accurately: the spring equinox and the autumn equinox. Because on these two days, the length of day and night is equal all over the world, and the true solar time and mean solar time are consistent. In addition, we need to know the meridian of the East 8th Zone, which is 120° east longitude."
"This longitude passes through Hangzhou instead of the capital. The so-called capital time is actually the actual local time in . The time difference when calculating the longitude must be factored in the geographical distance from Hangzhou. This detail cannot be missed, otherwise the error may be large."
The calmer Bifang was, the more anxious Etienne became. He was almost about to jump up and down. He kept urging him and even couldn't help but untie the rope that tied the glider to the tree.
Etienne at the lakeside began to urge: "Are you ready?"
“Soon.”
"Are you ready?"
"It's almost done! Go collect the clothes first!"
Bifang frowned, he knew better than anyone that although the clouds seemed to be moving slowly, they were actually rushing at a speed of more than 40 or even 50 kilometers per hour, almost the same speed as cars in the city!
It will take less than ten minutes to catch up with them!
Concentrate, concentrate!
Bifang has already calculated most of the things, only the final result is left!
"Are you ready?" Etienne hugged his jacket tightly, looking at the clouds that were almost descending on his head, his heart almost jumping out of his chest!
This time Bifang didn't say anything. He jumped up from the stone as if he had broken through a layer of dark membrane and returned to reality. The wind blew across the manuscript paper, and a coordinate jumped out.
(69°1'N, 24°56'E)!
[Wow, awesome! I actually figured it out!]
【This is awesome! 】
【Spaceship and knees are here! 】
[A master who solves math problems at the critical moment of life and death! Who else! ]
[What? A snowstorm is coming? Please let me finish this question first]
Bifang pulled the jacket over and put it on. At this moment, a strong wind suddenly blew his black jacket, making it rustle like a big flag.
"Let's go, get on the plane!"
Etienne shouted excitedly and called back Yan Niao to jump onto the glider. Bifang pulled out a map and found their current location based on the longitude and latitude.
It’s off-center!
The route that was originally in the southwest direction turned into the southeast direction!
Bifang put away the map and came to the lake. He was stunned to see Etienne sitting in the driver's seat. He waved his hand and asked him to sit back: "What are you doing? Sit in the back!"
[Hahaha, which young man doesn't want to fly a glider?]
[Fang Shen is scared]
[This is a habit.]
Etienne also realized that he was sitting in the wrong seat and quickly climbed to the back row.
Bifang sat in the driving seat, started the engine, and the propeller blades rotated rapidly, driving the glider to slide slowly.
Etienne in the back row kept blowing the whistle, and the geese, who were a little panicked by the wind and snow, gradually gathered together and quickly formed a V-shape. With the experience from the first time, the organization was very fast this time.
Scattered snowflakes began to fly and fell on the lake for a long time without melting. Etienne reached out to take them and found that the snowflakes were surprisingly large, almost the size of beans.
"This snow fell too late. A large amount of water vapor has accumulated, which may cause severe sudden snowfall." Bifang looked serious, wishing the propeller would turn faster.
Just now it was far away and no one felt anything. But now that the clouds are approaching, we realize that they are so thick that the sun is almost completely blocked and no sunlight can be seen.
The terrifying sound of the wind resounded through the sky and disappeared in the boundless snow, like evil spirits being released.
"If I'm not mistaken, this is a nimbostratus cloud, which is often evenly distributed throughout the sky. The thickness is generally 4 to 5 kilometers, which is equivalent to 10 Shanghai World Financial Centers stacked together. This thickness is enough to completely block the light of the sun and the moon!"
Finally, when the snow was getting heavier and the clouds were almost covering the sky, the glider finally left the water.
The netizens started cheering, but just as the glider took off, a strong wind suddenly lifted the plane up almost 70 degrees, scaring the audience so much that they almost had a heart attack!
Fortunately, Bifang pulled the joystick in advance and lowered the nose of the plane, so he was able to barely control the plane and took advantage of the wind to climb!
Facing the strong wind, the glider flew very fast. Etienne, who was sitting in the back, felt like he was on a roller coaster, with a strong sense of back contact. Soon, accompanied by violent shaking, they successfully rushed out with snowflakes!
The clouds behind him were still chasing him, but it was too late. The glider rose into the sky, the howling wind roared, the snow flew, and it made an unwilling roar.
Just a little bit more and there is a natural chasm!
The plane gradually leveled off, and Etienne looked behind him and found that all the eighteen geese were safe and sound!
They were flying so fast just now that he was worried that the geese would fall behind.
Bifang looked back and saw Etienne's nervousness, and explained, "Don't worry, wild geese fly very fast, at 68 to 90 kilometers per hour. Even a long journey of more than 5,000 kilometers only takes more than a month. It is faster than the wind in a snowstorm, and the wind is in our favor. We fly fast, and they won't be slow either."
[It was too dangerous just now. Luckily I flew early, otherwise I would be dead.]
[Yes, if a blizzard came suddenly, it would be hopeless, right? Fortunately, the plane flies fast.]
【By the way, didn’t Lao Fang measure the longitude and latitude when he was in Mohe last time? Wouldn’t he have been able to locate the rescue point if he had measured it? 】
[You are stupid. The essence of measuring longitude and latitude is to look at the height of celestial bodies. There was a snowstorm in Mohe for several days and there was no sunshine. What celestial bodies did you look at? Think before you speak.]
[Awesome, there is actually a grumpy guy who understood it ! So powerful]
Bifang smiled when he saw his friends chatting. He was indeed lucky this time as he managed to escape before the blizzard came. However, he didn't need to be too scared if they caught up with him. It wasn't the first time he had encountered such a thing. As long as he didn't encounter a storm in the North Sea, it would be fine.
A storm at sea is much more dangerous than a blizzard on land.
