It was a sunny day just now, but less than half an hour later, lead-colored clouds pushed over from the southeast, as thick as a quilt in winter.
[This weather is so scary. Is it going to snow? 】
[It seems, I remember the professor said yesterday that it will snow the day after tomorrow, but this is only the second day? 】
[There are errors in weather forecasts, right?]
[Fang Shen, run away quickly, otherwise it will be too late! 】
The sailors became anxious when they saw the clouds. They still vividly remembered the power of the last snowstorm. If they were trapped, the gliders would not be able to fly, and the geese might freeze to death.
Etienne tugged at Bifang's robe nervously.
"Boss, it's going to snow."
Bi Fang naturally saw the slowly drifting clouds, but he didn't rush. It was useless to rush. The more anxious he was, the harder it would be to figure it out.
"Don't worry, it's useless to be anxious. It will take some time for the clouds to drift over. The most important thing for us is to find our current position and determine the direction before flying. Otherwise, the route may become more and more deviated. If we run into humans,
If you go to the city, the geese will remember that it is very dangerous."
"You can put out the fire first, pick a few pieces of charcoal and wrap it with soil and take it away, then pour it with water and remember to cover it with soil."
Hearing what Bifang said, Etienne could only endure it for the time being and act according to Bifang's instructions. However, his shaking feet still exposed his nervousness.
Bi Fangze was explaining to the audience while calculating, and he didn't seem to be panicked at all, but people with a discerning eye could still tell that he was recalculating a value.
The value just calculated was wrong.
"The sun's elevation angle =, then calculate the latitude of the observation point = 90 - the sun's elevation angle + the sun's declination obtained from the almanac, and the latitude is calculated in this way."
"If the days are sunny in the future, repeating multiple observations and calculating the average several times can improve the accuracy. If this method is calculated properly, the measurement accuracy error will be less than 13,000, and the positioning accuracy can be no more than 4 kilometers."
Bi Fang's hands obviously sped up, his words became tighter and tighter, and the numbers became even more connected.
"The two most accurate days of the year for measuring orientation using the sun are the vernal equinox and the autumnal equinox, because the global day and night are equal in length on these two days, and true solar time and mean solar time are the same. In addition, you need to understand that the meridian of the East Eighth District is 120 east longitude.
°.”
"This longitude happens to pass through Hangzhou instead of the capital. The so-called capital time is actually the actual local time in Hangzhou. The time difference when calculating the longitude must be summed up in the geographical distance difference between Hangzhou and Hangzhou."
Etienne looked more and more anxious, as if he was about to jump. He kept urging him from the side, and even went to untie the glider to the tree.
"Ok?"
"Soon."
"Ok?"
"Come on, come on! Go collect your clothes!"
Bi Fang frowned. He knew better than anyone else that the clouds seemed to be moving slowly, but in fact they were rushing at a speed of more than forty or even fifty kilometers per hour, almost as fast as a car!
It only takes less than ten minutes to catch up with them!
"Are you ready?" Etienne hugged his jacket tightly and jumped anxiously as he looked at the clouds that were almost coming over his head.
Bi Fang didn't speak this time. He opened the manuscript paper, scratched it with pencil, and a coordinate appeared on the paper.
(69°1' north latitude, 24°76' east longitude)!
[Damn, that’s awesome! You really figured it out!]
【So awesome!】
[Send the spaceship and knees!]
[The boss who does math problems in life-or-death situations! Who else!]
[What? A snowstorm is coming? Please let me finish this question first]
"Let's go, get on the plane!"
Etienne nodded excitedly, quickly recalled the wild goose, and jumped on the glider. Bi Fang followed behind and pulled out a map, and found their current location based on the longitude and latitude. Sure enough, they were off!
The route that was originally in the southwest direction became the southeast direction!
Bifang put on some damp clothes, put away the map and came to the lake. When he saw Etienne sitting in the driver's seat, he was startled and waved him to sit back: "What are you doing? Sit in the back!"
[Hahaha, which boy doesn’t have the desire to fly a glider]
[Fang Shen is scared]
【This is something I have become accustomed to】
Etienne also realized that he was sitting in the wrong seat, smiled and climbed to the back row.
Bi Fang sat on the driver's seat, pulled the engine, and the spiral blades rotated rapidly, causing the glider to slide slowly.
Etienne in the back row kept blowing his whistle, and the somewhat panicked geese gradually gathered and quickly formed a herringbone formation. Having experienced this, the organization was very fast this time.
Fragments of snowflakes began to fly and fell on the lake for a long time. Etienne reached out to take it and found that the snowflakes were surprisingly big, almost the size of beans.
"This snow fell too late. A large amount of water vapor accumulated together, which may cause severe and sudden snowfall." Bi Fang looked serious, wishing that the propeller could turn faster.
We were far away just now, so we didn't feel anything. Now that the clouds were approaching, we realized that the clouds were so thick that the sun was almost completely obscured, and no sunlight could be seen.
The shrill and terrifying sound of the wind resounded through the sky and disappeared into the vast snow, like evil spirits being released one by one.
"If I read it correctly, these are nimbostratus clouds, which are often evenly distributed throughout the sky. The thickness is generally 4 to 5 kilometers, which is equivalent to the height of 10 Shanghai World Financial Centers stacked together. This thickness is enough to cover the sun.
And all the light of the moon is obscured!”
Water friends who had no idea about data were panicked upon hearing this.
Finally, when the snow was getting heavier and the clouds almost covered the top of the head, the glider finally left the water.
The sailors started cheering, but as soon as the glider took off, a strong wind suddenly lifted the aircraft up almost 70 degrees, scaring the audience to the point of having a heart attack. Fortunately, Bifang pulled the joystick in advance and lowered the nose of the aircraft.
Only then did he barely control the plane, and took advantage of the wind to climb up!
Facing the strong wind, the glider flew very fast. Sitting in the back, Etienne felt like he was riding a roller coaster, with a strong feeling against his back. It didn't take long for him to start flying away from the clouds and outwards.
The plane gradually calmed down, and Etienne looked behind him and breathed a sigh of relief when he found that not a single one of the eighteen geese was missing. They were all safe and sound.
He was flying so fast just now, and he was worried that the geese would fall behind.
Bi Fang turned around and saw Etienne's nervousness, and explained: "Don't worry, wild geese can fly very fast. They can fly 68 to 90 kilometers per hour. Even a long journey of more than 5,000 kilometers only takes more than a month.
, faster than the wind speed in a snowstorm, and the wind direction is tailwind. If we fly fast, they will not slow down."
[It was too dangerous just now. Fortunately, we flew early, otherwise it would have been lost.]
[That’s right, if a blizzard suddenly comes, wouldn’t it be gone? Fortunately, the plane flies fast]
[Speaking of which, the last time we visited Laofang Mohe, we didn’t measure the latitude and longitude? If we measured it, wouldn’t we be able to locate the rescue location? 】
[You are stupid. The essence of measuring longitude and latitude is to look at the height of celestial bodies. During the snowstorm in Mohe for a few days, there was no sunlight. What do you think of the celestial bodies? You have said it before. 】
[Awesome, a grumpy old man actually understands this! So powerful]
Bi Fang looked at the water friends and smiled. He was indeed lucky this time and escaped before the blizzard came. However, what worried him was whether the climate change in Finland would affect the North Sea.
airflow?
Storms at sea are much more dangerous than snowstorms on the road.