"This is called the Celestial Globe. Pen, fun, pavilion www. biquge。 info And this, it's called the globe. ”

Zhang De did not explain what a celestial globe is and what a globe is, but said to the teenagers of different ages in the audience, "You have learned coordinates, so how do you use the specific role of coordinates in life?" ”

"Measuring the height of Linzhang Mountain, mapping the topography of Linzhang Mountain, you have used contour lines and learned scales. However, when someone asks you: this old man, where is Linzhang Mountain? How do you answer? ”

"Obviously, you will say: how many miles to the west of Hanyang, how many miles to the south of Hanshui. This is the role of coordinates. ”

To draw a map of the world, except for a few remote places like the Solomon Islands or the Seychelles, as an engineering dog, it can be drawn very similarly.

But to be accurate to how the projection on the globe is and how to scale, this still needs to be mapped. Of course, according to the strength of the three major fleets now, there is no problem at all in making a circumnavigation voyage, and from the northern part of the Pacific Ocean, a large ship built by Zhenguan in eight years can reach the west coast of North America in two months at the earliest.

However, Zhang De never mentioned this, the main role of the three fleets, in addition to plundering, is to eliminate those natives who refuse to cooperate in the coastal sea, and then, establish strongholds, open up plantations or salt farms, and then fill in slaves to extract every drop of profit.

Wow......

Zhang De turned the globe: "What we want to say today is that it is wrong for the sky to be round and the place is wrong, and the earth is like a chicken. ”

The theory of the circle of the earth was put forward quite a long time ago, but the scholars of the Middle Ages and ancient times could not explain all this, because there was no empirical evidence.

However, mathematicians, in their observations of celestial bodies and periodic calculations, vaguely felt that "the earth is like a chicken" was right, but in the absence of proof, this did not meet the needs of the ruling elite.

Normal, abnormal, bear, and non-bear children, after their brains crashed, they were stunned for a long time. Their receptivity is already quite good, and "Cao Chong's Theorem" allows them to work in the boat industry, and it is more than enough to study for a longer time and be a planner.

The fourteen or fifteen-year-old boy has already left behind the old sixty or seventy-year-old master of "Counting the Scriptures".

This is a group of children who have understood "force", "acceleration", and "quality", learning is painful, but the desire for knowledge, when ignorance, is the most like an addiction that cannot be stopped, so that they are not tired of it regardless of poverty or surplus.

Even if the knowledge they are learning now seems to be only a member of the bottom of the small officials, and even the small officials may not be able to use them. The upward channel of the Tang Dynasty has nothing to do with them.

The sons of these "Qianshou", "craftsmen" and "merchants" have struggled for a glorious lintel through the imperial examination, which is about the same as the difficulty of Zhang De building a Xiaobawang learning machine this year.

A lesson in extreme impact, Zhang De allowed them to doubt, but would not explain. Instead, it uses mathematics to speak, and the mathematical relationship between the tides and the moon, and the mathematical relationship between the earth and the sun, are all really reflected in life. Years, months, and days, which can be seen and touched, but the truth cannot be added, even if it is another thousand years, it is also so real.

Ten thousand years ago, thousands of years ago, and a hundred years ago, people had different life experiences, but the starry sky, moonlight, and sun above their heads only changed slightly.

The spring and autumn equinox are a matter of great knowledge to the peasant officials, and the old peasants may know, but more importantly, they do not know that no matter how many years they have planted the land from generation to generation, they still eventually ask those who have mastered the knowledge of agricultural time in the court or the noble families.

The children learned the word "solar return", and then Zhang De drew a dotted line on the globe and told them that this is called the northern solar tropic of cancer.

"From the day after tomorrow, we will use this tool to see what the gold, wood, water, fire, and earth above our heads look like."

A rudimentary telescope was set aside, and in fact, it couldn't see what the gold, wood, water, fire, and earth looked like, but it was enough for the bears to know that there was no fart on the moon overhead.

Just as they know through the drainage method, there are only more than 20% of the components in the air that really provide combustion.

The schoolchildren's eyes widened, they had used binoculars, but it was just a toy-like thing. They had also used microscopes, and they knew that there were more than 48,000 caterpillars in the water, and that the bald heads were all. They saw a bug with only one cell, dragging a long flagella, and it was very ugly.

"Sir, what about today's schoolwork?"

"Assigned according to the group, the older one takes the younger one to the river to design a windmill. The minimum requirement is to be able to resist the wind, and the score is subject to the extensiveness of the workmanship. What materials are needed, how much they want, calculated within each group, and then handed over to Mr. Matsuhaku. ”

"Yes, sir!"

Some frowned, some were excited, and some waved their fists......

Zhang De needs genius-level characters to appear, but he also needs to contribute to the bricks. Maybe among the third batch of students, there are still no amazing talents, and that kind of monster similar to Li Shan is really rare but not sought.

It's a pity that Li Shan is a close disciple of Master Cao. Although this disciple has learned to call himself a "Capricorn born in winter", this is also a closed disciple of Cao Xian, who calls himself a "Capricorn born in winter".

Every time he thinks of this, Lao Zhang always has a kind of pain that slips between his fingers to slip a living Newton or Maxwell.

Blind him with such a set of dragon constellation holy clothes and Mark Five Iron Man suit...... Meat buns beat dogs, typical of which there is no return.

There were already windmills in operation on both sides of the Han River, which were initially operated as assets of the Canzhou Prefecture Bureau, mainly engaged in grinding rice, flour, grain and oil, and deep processing of bran and rice bran, but soon because of the fast processing and low fees, all the small and medium-sized landlords in the vicinity of Hanyang who operated such a livelihood were squeezed into bankruptcy.

In desperation, these small and medium-sized landlords, who had difficulty receiving land rent and could only rely on additional operations to ensure their living standards, used their fields as collateral to borrow money from semi-official banks.

Every new windmill is the livelihood of these small and medium-sized landlords. After processing the grain produced in their fields, they were accepted by the Chuzhou Government Bureau, and then purchased and stored in a unified manner, and then handed over to SF Express to be transported to Chang'an and Luoyang for value-added sales.

In today's Guanluo land, as long as it is the citizen class, the food is becoming more refined, even if it is Zhong Dingming's food family, they often eat out to consume, and these second-processed agricultural products can be on their table.

Whether or not a windmill can be built is an important factor of production for small and medium-sized landlords who can enter this consumption chain. But who can repair and who can repair well is another matter.

What Zhang De wants to do is to let the students not be frustrated after entering the society while absorbing knowledge, so that they can at least have a way to make a living.