Back in his bedroom, Li Shu dimmed the light, leaned on the bedside and started to use his mobile phone Moments.

Outside the window, there was heavy snow, quiet and white.

Inside the house.

The big yellow dog sleeps on the bed with its spine back, and it won’t be cold due to the floor heating in the house, while the big orange cat, white squirrel, and thrush are nestled on the bed. The big orange cat’s purring sounds one after another, and the air seems to be full of tranquility. .

"Send the photos I took today to Moments!" Li Shu smiled, 9 photos were formed into a nine-square grid, and then accompanied by the text: [First day in Greenland! 】

Li Shu then looked through his friends' circle of friends. When he liked and commented on other people's circle of friends, other people were also liking and commenting on him.

Xu Hao, Fan Biao, Ye Wenbo, Weikena, Yan Zhang, Li Sha, Yu Bingbing, Wang Tianyuan, Cao Cao and others were all commenting, and Li Shu responded to them.

Buzzing~

The phone vibrated suddenly, and it turned out that Huang Yun had sent him a video invitation.

"Ashu, how about Greenland? I searched for the information over there. It is said that there is Aurora, I really want to check it out." Huang Yun wore a light green skirt, and she was sitting cross-legged in the bed. Eat an apple, there is a laptop on the computer table at the end of the bed, and there are advertisements for variety shows on it.

"There should be aurora, but we haven't seen it yet. It's just that there is heavy snow with goose feathers outside, and it is super beautiful." Li Shu rolled the big yellow dog in the snow, and the big orange cat made a cat face imprint in the snow. To Huang Yun, this is what he just recorded.

"Wow, what a big snow, huh? What does the big orange cat do with its face in the snow?" Huang Yun's bed has a curtain, which is a small enclosed space.

"Sorry, she seems to want to print her face on the snow." Li Shu pointed the camera at the sleeping big orange cat, big orange cat, white squirrel and thrush bird sleeping together. Sleeping on the neck, it looks very warm and harmonious.

"Haha, I feel that the three of them are sleeping soundly, I want to record the screen!" Huang Yun wanted to turn on the screen recording. "I read the Internet and said, Greenland is so cold, why the temperature in winter can reach minus 50 degrees, right? real?"

Knowing that Li Shu had gone to Greenland, Huang Yun searched for a lot of information about Greenland. She didn't know that there was such a place in the world as Greenland before.

"Um, Greenland is very large, more than 2 million square kilometers, and thousands of kilometers from north to south." Li Shu smiled: "In the middle of the island, the north is full of permafrost, even glaciers that have not melted for thousands of years. Those places are still In the polar night area, of course it is very cold." Li Shu smiled and said:

"The capital where we are now is in the southwest corner. It is not in the Arctic Circle. In summer, the ice and snow will melt and flowers and plants will grow. The temperature here is not so cold.

Besides, we are all wearing cotton-padded clothes, and there is floor heating indoors, so it won’t be cold. By the way, tomorrow there will be a dozen grand-dog sledding competitions. I will show you the pictures of the competition in time. "

"Okay, okay." Huang Yun was very happy, and she suddenly asked, "What is the polar night? Some say that Greenland is in the extreme day, and some say it is the extreme night. I am blinded."

Li Shu instantly laughed: "The polar night is always the dark night, the night may last for several months, the polar day is always the day, the day may last for several months, and there is no night.

The earth can be regarded as a sphere, the sun is much larger than the earth, and the light it hits the earth can be regarded as parallel light.

The earth traverses the middle line is the equator, but one of the reasons why we have changes throughout the year is that the sun's rays do not always shine directly at the equator, but sway in a range between the north and south of the equator.

This range is between the "Tropic of Cancer" and the "Tropic of Capricorn". The so-called "Tropic of Capricorn" is the most northerly place where solar energy is directly irradiated. The Tropic of Cancer passes through China's Guangdong, Guangxi, and Baodao.

And the day when the sun hits the Tropic of Cancer directly is the "summer solstice" of the 24 solar terms of China. On that day, when standing near the Tropic of Cancer, the sun is directly above the top of the head at noon, and the shadow just falls under a small ball! "

"Hiss~ It feels so interesting, the summer solstice is directly on the Tropic of Cancer?" Huang Yun asked.

"Basically it can't be wrong. Well, this is my geography knowledge from junior high school. Now it is a bit vague. You can search and search. If I am wrong, just treat it as I didn't say it." Li Shu smiled.

Huang Yun: "..."

"If you make a mistake, then treat it as if you didn't say it? Haha, why do you leave yourself a way out?" Huang Yun smiled and shrugged her shoulders. She suddenly felt that Li Shu was a little cute.

"Afraid of being slapped in the face." Li Shu said with a smile: "Continue with the topic just now, because the sun's rays move from the equator to the Tropic of Cancer, so the light it emits also moves north.

The moving distance is not short!

Because in the south of Singapore, direct sunlight moves from the south of Singapore to the north, passing through Malaysia, Thailand, Vietnam, and then to China. After the direct sunlight hits the Tropic of Cancer, the direct sunlight will move south again and move to the Tropic of Capricorn. From summer to winter. "

Huang Yun nodded excitedly: "Direct sunlight from the Tropic of Capricorn to the Tropic of Cancer, China from winter to spring, and then to midsummer; Direct sunlight from the Tropic of Cancer slowly returns to the Tropic of Capricorn~lightnovelpub.net~ that China is caused by From summer to autumn, and then to winter; the second year repeats itself again and again, and again in the four seasons of the year! Hey! The four seasons are here!

They are all the same earth. I didn't expect that the difference in the location of direct sunlight would seriously affect the changes in temperature, and even cause extreme climates such as midsummer and cold winter. "

"That's right." Li Shu said with a smile: "It's easy to understand that direct sunlight moves. When direct sunlight moves from the equator to the Tropic of Cancer, polar day phenomenon begins to appear at the North Pole, while polar night phenomenon begins to appear at the South Pole.

The closer the direct sunlight is to the Tropic of Cancer, the greater the polar day range of the North Pole and the greater the polar night range of the South Pole.

Of course, when direct sunlight irradiates the Tropic of Cancer, moves south to the equator, and then crosses the equator and then moves south, polar nights begin to appear in the North Pole, and polar days begin to appear in the South Pole.

This is what I understand. There should be no mistakes. If I make mistakes, I will treat them as if I didn't say these things. "

"Hahaha, um, I seem to understand." Huang Yun nodded, "So when the North Pole is in a state of polar night, the South Pole is in a state of polar day, and vice versa. Now, isn't most of Greenland's land in a state of polar night? ?

It's a cold winter in Huaxia, so the sunlight must have ran away and went straight to the vicinity of the Tropic of Capricorn, otherwise Huaxia won't be so cold, right? "

"Yes." Li Shu smiled and said, "You have been a teacher!"

"Hehe, I was smart since I was a kid."

"Ahem, boasting is okay." Li Shu smiled: "Actually, I have been thinking about whether to fly north by plane and enter the polar night zone of Greenland."

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