The Great God Lives Next Door: Strongly Doting on the Cute Wife

Chapter 33 A Rich and Interesting Astronomy Lesson

Then, Qian Jingyu slowly analyzed what astronomy is and how to learn this subject.

"In this class, we will introduce some wonderful astronomical phenomena. First of all, the first one is the lunar eclipse we have seen in the past few years." Qian Jingyu said, and pressed the remote control in his hand to look at the PPT, which was presented on the big screen. Several photos of the lunar eclipse.

Afterwards, Qian Jingyu combined pictures and the formation process of a lunar eclipse to vividly and interestingly explain what a lunar eclipse is and how a lunar eclipse occurs.

"A lunar eclipse occurs when the sun, the earth and the moon line up on a full moon, and the moon moves to the shadow of the earth. On the earth, we can see the process of the moon from waxing to waning and then to full within half an hour to a few hours. It is commonly known as 'Tengu eats the moon'."

Speaking of this, Qian Jingyu added that the formation of a solar eclipse is also the same reason.Continue to circle the angles in the picture with the red dot.

"And because there is an angle of 5 degrees between the moon's orbital plane around the earth and the reasonable orbital plane of the earth around the sun. Therefore, when the moon is full or new, the sun, the earth, and the moon are not actually a straight line. Only when the moon and the earth Solar and lunar eclipses can only be seen when there is a perfect straight line between the suns."

"But because the moon's shadow is relatively small, it sweeps a small area on the earth, and the area that can be seen is not large, especially a total solar eclipse, so it is more difficult to see."

"In fact, relative to the entire universe, there are thousands of star-planetary systems, and eclipses are really a very common phenomenon. But the occurrence of total solar eclipses is likely to be very rare

Things. "

"Because a total solar eclipse occurs solely because the diameter of the sun is about 400 times greater than that of the moon, and the distance from the sun to the earth is about 400 times greater than that of the moon, this exact multiple makes the shadow of the moon, that is, the shadow falling on the surface of the earth , which is just wide enough to cover the entire sun."

Speaking of this, Qian Jingyu paused, and asked the students again: "A solar eclipse has a solar eclipse, how is it formed? Can we see a lunar eclipse?"

The students sitting in the audience were stunned.You're talking so well, but there's something wrong all of a sudden!
The students listening to the lecture were confused, Professor, did you mention this? We didn’t hear it!And the girls who just wanted to catch a glimpse of her beauty were taking photos and posting them on their WeChat friends, showing off their obsession, so they didn’t know what the professor was talking about.

Qian Jingyu glanced at the classmates who were in the audience, and said with a slight smile, "Let's find a classmate to answer this question."

Hearing this sentence, the girls, whether they are attending lectures or looking at the beauty, hurriedly put down, flipped through the textbooks in their hands, and said silently: Don't hit me, don't hit me!

"Well, just that classmate, the female classmate who wears a white high collar and has her hair down." Qian Jingyu clicked casually and clicked on Wang Yue.

After hearing that Qian Jingyu had found a classmate to answer the question, the students breathed a sigh of relief: Fortunately, it's not me!

As for the students sitting around Wang Yue, when they heard Qian Jingyu say this side, their brains tensed up instantly, and when they knew it wasn't him, they made a false alarm.

Wang Yue sorted out the notes she had just made, and through her own deliberation, she slowly said: "A solar eclipse is when the moon is between the sun and the earth, and the three are in a straight line. If the umbra of the moon is not long enough to be completely reflected to the On Earth, what is in contact with the ground is the pseudo-umbra of the moon."

"Looking at the sun through the pseudo-umbra of the moon, the edge of the sun is still shining, forming an annular solar eclipse. But an annular eclipse cannot be seen because the umbra of the earth is much larger than that of the moon."

Qian Jingyu nodded while listening, "Very good, this student explained very clearly. Then let's talk about..."

(End of this chapter)