"Yes, it is precisely the clever combination of convex lenses of different materials that make the composite lenses come into being. The achromatic telescope we are about to use will allow us to observe clearer images. This is the beauty of composite lenses. In addition, we have a very important project this year." The president of the Academy of Astronomical Sciences mentioned two things to be announced before.

One of the things is most important to the Academy of Astronomical Sciences. The Academy of Astronomical Sciences is about to build a new observatory on the southern foot of Yanshan Mountain, and secondly, there is a project they are about to carry out.

"What project?" The students of the Astronomy Academy were surprised.

"According to the calculations of some of our professors, a rare astronomical phenomenon - Venus Transit! This is a good opportunity for our Astronomy Academy to observe and record. This time, detailed records are needed to leave an important observation data for future generations. If you miss this observation opportunity, you will not be able to see Venus Transit again in the next 60 years! In other words, this may be the only chance in your life to see the earth. Venus and the sun appear in the same straight line. Please be sure to be present." The dean said.

After being told by the dean, almost all the students from the Astronomy Academy were infuriated.

For the ancient people, the changes in stars may be a sign or warning from heaven. In the West, Mars symbolized the god of war, but in ancient China, it was called "Yimura" and is often associated with disasters and unknown.

But for students in the Astronomy Department, this is a good opportunity to witness and observe astronomical phenomena with their own eyes!

The Venus transit that occurred this year was the last Venus transit in the 17th century.

The so-called Venus transit means that Venus moves between the sun and the earth. The three happen to be in a straight line. At this time, people can see Venus passing through the sun with their naked eyes like a small black dot. The record of Venus transit is actually recorded in the "Five Stars" of the Western Han Dynasty.

"Our Astronomical Academy seems to have obtained a sufficient budget to build an astronomical station and produce new astronomical telescopes on the southern foot of Yanshan Mountain."

"The southern foot of Yanshan Mountain is still quite a distance from the urban area, about 100 to 200 miles. We may have to go there for observation in the future. If we think about it carefully, it is really inconvenient, and we also need to take a carriage. The best place for the astronomical station is of course in the mountains, which is too inconvenient."

"Venus transits, and it is said that the process lasts for six hours. We can use some special methods to observe using astronomical telescopes. This time, I was lucky. The ancients all had to observe with the naked eye, but in comparison, we don't know how much luck is."

"Some professors in the college claim that they can calculate the distance between the earth and the sun through this transit of Venus, and they don't know how to calculate it."

After the dean announced his dissolution, students from the astronomy department were still discussing two major events announced by the dean.

The astronomical station was established and some astronomical phenomena began to observe and study. The astronomy field began to depart from serving agriculture and politics, and gradually became a separate science!

Salina was particularly excited. During the period when Li Jinde was away, she could only distract herself by relying on her daughter and studying. Using an astronomical telescope to observe the transit of Venus, which was so exciting for her.

In this era when they are still arguing over geocentricism or heliocentricism, they have begun to study extraterrestrial bodies!

"Salina!"

When she walked out of the Astronomy Academy, she found Princess Sophia waving at her, looking like she was dancing.

Next to Sophia, there are women she met such as Ella, Da Yu'er, Xiao Xiu'er, and Liu Rushi.

"Why are you here?" Salina didn't know why.

"Hehe, we want to visit your home." Princess Sophia said mysteriously.

"Of course we welcome, but why?" Salina was completely confused by them.

"We want to see Ying'er." Xiao Xiu'er also had an intriguing smile.

When Salina saw the girls today, she couldn't help but feel a little confused, but the other women were unwilling to tell her what was going on.

"Hehe, let's go to your house!" Princess Sophia almost pulled Salina to speed up, as if she wanted to see something interesting.

"Your Highness, you should pay attention to your behavior..."

"What princess? I'm Sophia now. Let's go!"

"Princess Sophia, you see that Salina is not in a hurry yet, why are you even more anxious?" Da Yuer smiled while pursing her lips.

"I'm going to watch the show..." Princess Sophia pouted, still holding Salina.

Salina didn't know what the girls were doing, but when she was almost carried back to her house by Princess Sophia, she gradually discovered something unusual.

Many acquaintances on the streets of the mansion looked at her. Some people were planning to come up to say hello to Salina and tell her something, but the vicious Princess Sophia glared the people back with her eyes, for fear that these people would disturb her pleasure.

Li Jinde's mansion is more lively than usual at this time, and you can hear the noise inside outside. If it were normal, there were usually only a few women inside, so it would be impossible to be so lively.

"You guess what is the reason we are so anxious to pull you back from the Astronomy Academy?" Princess Sophia stopped pulling Salina this time, but instead stopped her, staring at her with a sly smile, as if she wanted to see the change of expression on her face.

Princess Sofia was not disappointed. Salina seemed to have thought of something. Her originally calm expression became surprised, and then she was happy. Finally, there was a surprise. She held Princess Sofia's hand and her tone was trembling: "Is it..."

"You guessed it right." The girls said almost in unison.

"Ah, don't lie to me! I want to go in quickly... No, is there a small mirror?" Salina originally planned to bypass Princess Sophia and go directly into the house, but she thought that her complexion must be very bad at this time, so she asked anxiously.

At this moment, a familiar and long-lost figure appeared in front of her.

When the man heard the movement outside, he felt strange, so he walked out of the mansion with his daughter in his arms. When he saw Salina, the two of them were almost stunned.

"I'm back." Li Jinde thought of many words on the way back, but when he saw Salina, there were only a few words left.
Chapter completed!