After finishing the lecture, Zhong Hua took advantage of everyone's contemplation, approached the front and asked privately: "Xiaguan still has something to understand, why does this zero degree line need to be called the meridian?" And why is the zero point in the Taiji Hall in the palace? Eager eyes blinked. The draftsmen who were about to do their own things, or who were collecting their notes, stopped what they were doing, and their eyes were all focused on this son.

I really want to scold him for a lot of things, Prime Meridian, I'm not an Englishman, I'm not a geographer, and the books I teach don't have the name of this explained, it's really, alas, a trick!

"Meridian ......" rolled his eyes, simple, and coughed: "As for why Fang Mou uses the name prime meridian to call the zero degree line, it is actually very simple. Ben, the beginning, these two words all refer to the origin of the meaning, metaphor longitude and latitude, from here to extend to the open, every day, there are twelve hours, sub-time to yin, noon anode, in order to metaphor yin and yang alternately, warp and weft cross the meaning, I don't know if this explanation can be taken or not. "As for whether the earth is square or round, well, we don't have the ability to make these old guys who are deeply poisoned by feudal ideology immediately enlighten, anyway, let them know that the latitude and longitude must be crossed at a right angle of 90 degrees, in case one day our Datang hits all over the world, it is not too late to deal with these small problems slowly.

If the old man Fang, a resolute defender of feudalism and Taoism at home, knows about it, don't treat me as a nervous disorder, bundle it up and throw it into charcoal foam in the firewood pile to eliminate harm for the country and the people.

Dozens of heads moved up and down in unison, well, solved one problem, as for the other. "As for why it stands in the Taiji Hall in the palace, this point, the Taiji Hall is located on the central axis of Chang'an, Yanjing of the Tang Dynasty, and is located in the center of the palace, which is the place where His Majesty holds a court meeting. Towards Zhong Hua and asked him rhetorically, brush, dozens of heads shook quickly, who dared to say that he was uneasy there, it was to the Tang Dynasty, hehehe, we don't need to say it explicitly.

"Wonderful, wonderful, Childe is really worthy of my Tang Dynasty celebrity, there are many words in the mouth, Zhong Hua is really, thank you for the teachings of Childe......" Zhong Hua's expression and eyes looked so worshipful. Well,Very good.,Today Ben Gongzi is famous again.,I don't know if the explanation of the prime meridian means this.,The problem is that we can fool others.,Think what I'm saying is the truth.,That's the ability.,Hehehe...... I said goodbye to Lang Zhong and a cadre of officials in the Ministry of Works, and just after leaving the imperial city, I remembered a major event, and went straight to the East Market, and after a while, I came to the door of the last shop.

"The shopkeeper is here?!" As soon as I entered the door, I saw two young men greeting guests in front of me, and asked a young man.

"What is the matter with Childe looking for our shopkeeper?"

"Oh, you tell him that the guest who ordered the crystal chip with him last time is here." He smiled at the guy. After a while, the old shopkeeper who I mistook for a compatriot last time walked out of the back room with a box in his hand, and when he saw me, he hurriedly greeted: "Oh, this son, old man, but when you talk about it, this object has already been polished." He happily handed the box to me like a treasure: "This thing is guaranteed to be as smooth as jade, crystal clear, and shining in the moon......," he boasted vigorously.

"Mmmm, very good......" I responded randomly, opened the wooden box, a large convex lens about three inches square, and there were four pieces of two concave, two convex, different sizes of crystal pieces, all of which were crystal clear lying at the bottom of the wooden box cushioned by red silk, I was a little excited, trembling and stretched out my hand, carefully picked up the big piece, good, very good, no trace of impurities and cracks, the surface is smooth, there is no trace of roughness, I took it and took it, it was very good, The pores were enlarged a lot in an instant, and they appeared in front of my eyes. It's done! Hey, hey, hey...... didn't want the old guy who was wandering around in front of me to see what it was for, and after only looking at the transparency and clarity, he put the lid on the box, paid for it, and when the old shopkeeper squinted and counted the money, I then asked, "Shopkeeper, but there are colored crystals?" It must be the kind of solid color translucent, the kind without a line of impurities...... "I really want to make a pair of sunglasses, that thing is the most comfortable to wear on a sunny day."

"This, I'm afraid it's very expensive, the general crystal like this product in the hands of the son is considered a high-quality product, if there is a mixture of colors, I'm afraid it is, ......it's difficult to pick one out of a thousand miles," the old shopkeeper squinted his eyes and thought for a long time before saying.

"Oh, forget it, the shopkeeper's farewell, if necessary, I'll make trouble again." Hurriedly bidding farewell to the owner of the jewelry store, he happily walked into a liquor store in the East Market, filled his stomach, and then returned to the Jinju Yuan and shook his head, and pulled several heads and brains together, and gave instructions on the perfection of one step and the subdivision of the types of spies, and then very diligently conceived the charter for the formation of the military academy for a while, and when he raised his eyes, the sky was already dark, and it was almost unitary.

Put down the pen and stretched a big lazy waist, well, we should go to meet the Tubo minister, as soon as I entered the concert hall, I saw Fang Cheng carrying a horizontal knife at his waist, leading the horse and standing opposite, "Huh? What are you doing here. "Today, because of office work, Fang Cheng stayed at home.

"I've seen the second young master, the little one is on the order of the young master's little lady, and came to Wangjiang Tower with the young master, and the little lady also asked the little one to explain to the young master, listen more and say less." The loyal servant Fang Cheng immediately led the horse and walked over and said to me.

"Little lady? Oh, this girl, why is she so worried. Saying this, the heart is warm, the palace maid's sister seems to have her reason, for fear that I don't care, so I specially Fang Cheng also came, first, it must be a disguised reminder of what she told me today, and secondly, there is also someone to accompany me, in case I get drunk, someone will send me home.

"Let's go, then." took the BMW brought by the doorman, stepped up, lifted the reins of the horse, stepped off the healthy horse with a long neigh, and flew with four hooves, heading towards the Qujiang River in the southeasternmost corner of Chang'an City...... Qujiang horses step on the slow path by the river, the flowers are around, the wings are refracted by the sunset and the butterflies dance among the flowers, as if to take the last ray of sunshine, dance their dance generally, the weeping willows swing lightly, and the wind is blowing, the smoke and water and the brilliance of the sunset are rubbed together and spread out, the extra brightness, the distant fishing song has not yet dispersed, and the sound of the water beating near the shore has been reconciled. "What a view!" I couldn't help but sigh, although it is not a small bridge and flowing water, but it has a quaint style of smoke and water Chang'an.

"Well, the water is good!" Fang Cheng couldn't think of an adjective for a long time, and it took him half a day to hold back two words, but he also pointed out the beauty of Qujiang and the blue waves in broken gold.

"Let's go, it's not good to be late." said so in my mouth, but I hope that the Tubo is too stingy, if you can choose a good location, welcome the waves, it is a beautiful thing, this son is here to have fun and look at the beauty, not to accompany you old guy to twitter, I hope this Tubo old man understands this truth.

The three-storey wooden structure of the Wangjiang Tower stands on the bank of the Qujiang River, in the building complex of one or two floors, it seems to stand out from the crowd, and when it comes to the door, it has already been greeted by the guys, and the smiling face stretches out the reins. "This young man, the old man on the third floor has been waiting for you for a long time."

"Huh? How do you know my last name? I couldn't help but ask curiously, and turned my head to look at Fang Cheng, who was also very incomprehensible. At this moment, accompanied by Lang's laughter, Lu Dongzan, who had removed Hu Yi, was dressed as a Han man, walked out of the door and said: "Hehehe, Fang Gongzi, the old man has been waiting for the son for a long time, and when he looked around, he saw a white-clothed turbidity Shijia Gongzi standing on the bank of the Qujiang River. The special call guy came down first and waited. ”

"I'm really ashamed, I'm busy with official business, so I have to wait for Lord Lu for a long time." This old thing boasted that I was a little blushing, hurriedly returned the salute, and went in with the door, and went into the Qujiang Building, only to know that it was quite small, four three-story buildings, surrounded by an excellent pavilion in the middle, the lights were bright, with the last trace of daylight, the fat leaves and light flowers were more blurry-

"Lord Lu will pick a place." I am very emotional, really, I miss Li Ke, the brother who cut off the head of the chicken and burned the yellow paper, I don't know when this thing will come back to Chang'an to meet me as a virtuous brother.

"Where is it, the old man said that he changed into Hanfu today, just to follow the customs, in order to invite the son, the old man spent a lot of thought, let the servants inquire around, this spring, the shadow of the Qujiang River in Chang'an City, can be regarded as this!" Tubo gave a thumbs up and squeezed his eyes at me proudly.

"Oh? It's hard work, Lord Lu treats me like this, I'm really flattered......" his mouth responded, and he faintly felt that this old man was afraid that there was really some trick.

"Stop me from doing anything!" Fang Cheng's loud voice roared, shaking the dust on the edge of the stairs that was difficult to reach. What is this guy doing?

(To be continued)