Lu Zi'an actually demonstrated thousands of stars with just this morning light!

Sunrise, sunset.

In the flow of brilliance, all the jade balls refracted the light of the largest jade ball in turn.

They land on the observatory, and the light and shadow clearly point to each interval.

The crisp wind in the early morning made Lu Zi'an's mind more clear: "This is the Gui Watch, which is a tool used to measure the length of the sun's shadow, and it can determine the length of the sun's shadow at noon to determine the season, the return year or the solar year." The standing one is the table, which can produce shadows, and the horizontal one is the gui, which is a scale and is used to measure the length of the shadows...... The accuracy of the meter is directly proportional to the length of the watch. ”

At the same time, the light fell on Yugui, and Lu Zi'an pointed to this clear light and shadow: "This is the original appearance of the sundial (guǐ)." ”

There are eight types of sundials: horizontal sundials, equatorial sundials, polar sundials, and south-facing vertical sundials.

The most common, of course, is the horizontal sundial, which uses a horizontal dial, and the inclination of the sundial axis is set according to the latitude of the place where it is used.

"But...... Personally, I think that the timekeeping instruments of the ancients should be carved leaks rather than sundials. Lu Zi'an twisted his eyebrows slightly, thinking, and operated the jade ball to make a new change: "There is a saying in "History of the Ming Dynasty: Calendar I": The art of timing, the pot leakage is the ancient *** bell is the new method, but if you don't want to end in the sun and star, the day is used for the day, and the night is used for a star. For example, the time of a pillar of incense is timed by the burning of incense, in addition to incense leakage, field leakage and so on. ”

Is that so?

There are also professionals who know the history in detail and want to have an in-depth discussion on this statement.

But soon their thoughts were transferred to other aspects by Lu Zi'an, because at this time Lu Zi'an smiled and said: "I believe everyone can see that the prototype of this stargazing platform is Dengfeng Stargazing Platform, also known as Zhougong Observatory, scientific name "Eight-foot Watch", that is, the length of the watch on Dengfeng Stargazing Platform is eight feet, and the record of "The Scenery of the Sun, the ruler is five inches" in "Zhou Li", which means that at noon on the day of Dengfeng's announcement of the summer solstice, the shadow length of the eight-foot watch is just one foot and five inches.

Commonly known as "shadowless platform", if you happen to come to the stargazing platform during the summer solstice, you will find that there is no shadow when you stand on the stage. ”

[Is it so amazing?]

[Wow...... I was suddenly very interested! I just don't know how much it costs to go once. 】

[It feels so powerful, it must be very expensive......]

[The student party sighed with hope, and was shy in the bag!]

[One punch to kill the party, I've been to Dengfeng Observatory, ten yuan tickets, very conscientious price, okay? Ten yuan, you told me you didn't?]

【…… I'm going to see it on the summer solstice next year!

[I'll go too, I'll go!, or let's form a group!]

[This can be had!]

Seeing that the focus of the barrage was getting worse and worse, Lu Zi'an could only smile and pull it back: "Dengfeng Stargazing Platform was built around 1279, composed of a platform body and a measuring ruler, and the shape of the platform body is a bucket-shaped, and its function is to "visit the sun and shadow during the day, and watch the polar star at night, so as to be the morning and evening." "Zhou Li" records that in the Western Zhou Dynasty, Zhou Gong Ji Dan made an earthen and wooden table in Yangcheng, and measured the sun shadow to determine the 24 solar terms to guide farming, which is the origin of the 24 solar terms. ”

The sky was bright, and the cold wind in the early morning blew the corners of his clothes, caressing his eyebrows.

Lu Zi'an, who hadn't slept all night, looked a little haggard, but there was still a dazzling light in his eyes.

In such a hurry, he even sat down at the table and chatted with netizens about Guo Shoujing.

This is a very talented astronomer, mathematician, and hydraulic engineering expert, known as "Guo Taishi".

Since the thirteenth year of the Yuan Dynasty (1276), he was ordered to revise the new calendar, which lasted four years, referring to more than 1,000 years of astronomical data and more than 70 kinds of calendars, and formulated the "Chronological Calendar", which became the most advanced calendar in the world at that time.

Since its promulgation, the "Calendar of Time" has been used for more than 300 years, and it is the longest popular calendar in China.

In order to revise the calendar, Guo Shoujing also restructured and invented 12 new instruments, namely the simple instrument, the high table, the polar meter, the armillary celestial phenomenon, the exquisite instrument, the elevation instrument, the vertical fortune instrument, the evidence instrument, the scenery symbol, the peephole, the solar and lunar eclipse instrument, and the stardial timer.

All in all, it's a wizard.

Lu Zi'an talked about this Guo Taishi, it was really the first thing.

Those wonderful instruments, even if they are obtained today, make people feel how detailed they are.

In order to let everyone understand more intuitively, Lu Zi'an opened his notebook, which contained the drawings of these instruments.

It's clearer and easier to understand than what is printed.

[It feels so powerful, Master Lu, can you make them again?]

[Yes, I feel like these are so exquisite......]

Lu Zi'an raised his eyebrows and smiled: "If you are interested, I will leave these instruments as homework for the registered disciples of the Baigongmen, and everyone can come to Changyan to watch at that time." ”

Everyone laughed, only the registered disciples of the Baigong Sect were scattered in the wind: were they hallucinating? Why do they still have homework?

Someone immediately called Lu Ahui, completely forgetting what time it was.

But Lu Ahui was also guarding in front of the computer, so he rang and answered: "You'd better have a suitable reason." ”

Dare to disturb him to watch Master's live broadcast, it's like a mouse licking a cat's nose - looking for death!

"Senior Brother Lu, is what Master Lu said true?

Lu Ahui was happy when he heard it, he dared to be a scared little fool, and his heart was happy, but his voice was still serious: "Of course it's true." ”

“……”

"Before, it was to let you get familiar with various processes faster, and if your skills are not up to standard, you will naturally not leave homework, but now the heat is about the same, of course, you have to do homework. ”

Why does "......" have a sense of returning to high school?

"We were the same before, we still need to take the exam, the top three are promoted, and the ...... who didn't get in"

"It's terrible...... legs are trembling, and the voice is trembling, MMP, a panicked horse!

Lu Ahui teased for a while, feeling that he was about to form a group, so he hurriedly calmed him down.

This new little junior brother, why is he so cute!

He hung up the phone with a smile on his lips and continued to watch the live broadcast.

The display of the Dengfeng Stargazing Platform has been completed, and Lu Zian just stood up.

Reaching out and pulling out a few jade pieces, the outline of the outside remains the same, but the stargazing platform inside has changed.

As if fiddling with a Rubik's Cube, all the blocks switched and changed, and the stargazing platform sank down, and thirteen jade pillars rose up.

Unexpectedly, the ancient observatory of Taosi was re-revealed, and Lu Zi'an showed everyone the old routine, and finally said the name of this work: "This is ...... "Cycle and Repeat". ”

The sun and the moon are healthy, the stars are reasonable, the five elements of yin and yang, and the cycle repeats.

With his words, the sun shadow changed in the next round of changes in the light ball, and stunned the audience in the live broadcast room.

After the demonstration, Lu Zi'an also began to feel a little sleepy, and yawned: "Okay, that's all for today, let's rest quickly." ”

[Good night, oh no, good morning!]

Thank you for this gift, it's really beautiful. 】

[Can I sleep with you, I'm very good at warming the bed!]

Then there are difficult words, what "dancing guns and sticks", what "spewing blood", what "close attack and long-distance friendship", etc., which caused everyone to laugh: the live broadcast room was full of happy air.

Lu Zi'an turned off the computer, and the things on the table were just cleaned up casually, and then went back to the room to wash.

After taking a hot bath, the whole person was comfortable, and I fell asleep with a pillow.

As a result, there were always people who didn't give him a good night's sleep, and he slept for less than three hours when Zou Kai came and knocked on his door.

Lu Zi'an is very self-controlled, otherwise he would have slipped him directly with a slipper when Zou Kai knocked him for the first time.

He squinted his eyes slightly, and said in a hoarse voice, "You'd better have a reasonable reason." ”

"Jin Yutong is here. Zou Kai's rare expression was serious.

Jin Yutong: Who is this? Lack of sleep, Lu Zi'an's thinking was a little stagnant.

Zou Kai added: "Just the one last time, with no skin and no face, as soon as she came, she said that she wanted to adopt Qiqi, and then she was driven away, she is now in the museum, and she brought a lot of reporters over, saying that she wanted to unlock the Linglong Pagoda on the spot." ”