Before the audience has recovered from the storm, Bi Fang will embark on the journey again, which makes people worry whether the intensity of migration is too high.

They could still vividly remember the lightning and thunder a few hours ago. The majesty of the sky could not be looked directly at. In that situation, ordinary people would not even dare to go out, let alone fly a plane through the storm, and the drum washing machine would not spin like this.

.

[Is Fang Shen no longer a human being? If so, can you take me with you? I don’t want to do it either.]

【Flying at night, can the geese keep up?】

[Yes, Hei Buliuqiu, nothing will happen to him? 】

【It’s only a few hours, can you take a rest?】

"Of course you can. In fact, the migration of wild geese mostly occurs at dusk or night, and I chose daytime just because it is in line with human habits."

"And don't underestimate the resilience and endurance of geese. They are one of the few birds that can fly across the entire Himalayas."

Bifang pulled up the engine, and in the night, the glider flew through the sky like a giant black bird. Using it as an eye, eighteen geese lined up neatly behind him.

"Speaking of which, I rarely drive at night. When it comes to night, I have to mention the starry sky."

Breathing in the water vapor with the salty wind, Bi Fang turned the camera to the starfield, and the endless starry sky rotated above his head.

"As early as thousands of years ago, our ancestors have begun to use the movement of celestial bodies to determine their orientation. If you can determine your orientation through the movement of the sun, moon and stars, then even without navigation tools, you can

You can also find the right direction."

[I know this, look for the North Star!]

[There is also the Big Dipper, I have learned this in kindergarten!]

[Ah, isn't the Big Dipper the North Star...]

[I opened the door and took a look, wow, there were no stars!]

Due to the time of the live broadcast, the number of people in the live broadcast room dropped a lot, from more than 200,000 to about 100,000, but the barrage was not less at all, and the audience's enthusiasm was still high.

Bi Fang estimated that it should be nine o'clock in the evening, and it should be two o'clock in the morning in China. How could there be so many people active?

But people nowadays really lack some common sense. They can't even tell the difference between the North Star and the Big Dipper.

Bi Fang sighed silently. In fact, he could understand that people nowadays basically live in cities. At night, the only thing that lights up in the sky is the moon. Occasionally, the clouds are thicker and even the moon cannot be seen. This

In this case, who cares what the name of the invisible star is?

"Although the names of the Big Dipper and Polaris sound very similar, they are completely different things. First of all, the number is different. Polaris is the name of a star; the Big Dipper is composed of seven stars. It is named because its shape is like a bucket.

It’s called ‘Big Dipper’.”

"Secondly, the functions of the two are different. Polaris can accurately point to the direction of true north; while the role of the Big Dipper is to help us find Polaris. Polaris is on the extension line connecting the two stars below it."

Bi Fang raised his head and looked up at the stars and talked about some techniques for finding and identifying the stars. From the first person perspective, the audience directly followed his perspective to find the so-called Big Dipper.

"Polaris belongs to the constellation Ursa Minor and is the brightest one. However, since all the stars in Ursa Minor are dimmer except for Polaris, we usually need to look for Polaris based on the Big Dipper."

"The Big Dipper is the main body of the Ursa Major constellation. It is located at the tail of the Big Bear and is shaped like a spoon. The target range is larger, and it is faster and more convenient to confirm a single target Polaris through it."

Among the seven stars of the Beidou, 6 are 2nd magnitude stars and 1 is a 3rd magnitude star. It is very easy to identify, especially in an open and less polluted place like the sea. Once you take a look at it, you will never forget it.

The night sky is clear, and the sky is filled with clear light, as if a traveler has come to a silent moonlit night and found the direction home according to God's guidance.

[Holy shit, this is the first time I’ve actually seen the Big Dipper in my entire life!]

【Mom, I’m making a difference!】

【Look at your potential!】

[It’s worth staying up late to see the Big Dipper!]

[Because I often stay up late, my liver seems to be not in good condition. Can you guys call me a careful person? 】

"Extend the line connecting the two stars near the mouth of the bucket, that is, the Pole Star, about 5 times outside the mouth of the bucket, and you can find our target. The most important star indicating direction in the northern hemisphere, Polaris, have you seen it?"

Bi Fang stretched out his finger and turned his gaze along the connecting line. The audience soon discovered the brightest star in the night sky.

"There is no star brighter than Polaris in a large area near Polaris, so it is very easy to find it using this method."

"On the background of the starry sky, Polaris is less than 1° from the North Pole. When we find Polaris at night, we have basically found true north."

With the direction in hand, Bi Fang accelerated the speed of the plane, driving it through a gust of wind howling in the sky.

【Wow, it’s so bright】

[The brightness is completely different from other stars!]

"Of course, Polaris is one of the few first-magnitude stars."

Bi Fang was very happy. It felt great to share the good things with others, just like having teammates by his side in his previous life.

Etienne in the back row was also obsessed with the starry sky. When he heard the concept of a first-class star, he asked curiously: "What is a first-class star?"

"Ah, this..." Bi Fang scratched his head, "The brightness of stars is different, and it is related to the star's temperature, distance, etc., do you know this?"

"Uh-huh."

"According to legend, the ancient Greek Hipparchus divided starlight into six levels based on this difference in brightness. Stars of magnitude 1 are the brightest and stars of magnitude 6 are the dimmest. The brightness difference between stars of each magnitude is about 2.5 times. In fact,

There is a 100-fold difference in brightness between a star of magnitude 1 and a star of magnitude 6. But this hierarchy has continued, regardless of the distance of the star, it is the brightness that we show when we look at the star from the earth."

Etienne suddenly realized that this was the first time he had heard of this concept of hierarchy: "Is there any star brighter than Polaris?"

"Of course there is. The division of the six levels is very rough. Later, scientists formulated more levels. If a star is brighter than Altair, its magnitude is 0, and Vega is a 0-magnitude star."

Bi Fang changed the topic. With the North Star, as long as it is not dark clouds, it is impossible to lose your way at night, and you can drive safely and boldly.

"In addition to Polaris, we can also use the Orion constellation to determine our orientation on the dark night sky. Orion is surrounded by 4 bright stars to form a large quadrilateral, and in the center of the quadrilateral are 3 small stars side by side. We can use the small

An imaginary horizontal line drawn by a star is the celestial equator, and this line is the east-west line."

"Of course, if it's the southern hemisphere, it's different. The Big Dipper may be hidden below the horizon. I'll tell you when I get to the southern hemisphere."

【Southern Hemisphere? What's there?】

[Antarctica or Australia]

[Why are you still hiding it? I don’t accept it!]

"Ahem, it's all finished, what shall I say next?" Bi Fang spread his hands, "But it's not enough to have a direction. Our route is planned. We want to go to Denmark, not fly to the Netherlands or Copenhagen.
Chapter completed!