What's more, in the Tang Zhenguan, people still have no way to confirm the direction of the earth's surface deviation, because the concept of the sky is round and the place has been proved wrong through satellites in later generations, but the concept of the sky and the place is not the correct concept in the Tang Zhenguan.

But turning a wrong concept into a correct concept can often set off a war.

The easiest thing is to make the most basic mistake, because from south to north, from east to west, if you draw a straight line, it seems that there is no problem, but when you draw northeast, southwest, southeast, northwest, you will find that there will be deviations with any calculation method.

Knowing that people began to draw maps in the way of latitude and longitude, and that all kinds of deviations had the possibility of calculation, they gradually came up with the so-called correct map.

When calculating distances, it is relatively infallible, and in this era, almost all distances are passed down by word of mouth, or even by merchants.

Because if you go in the way of a business, the distance will not be wrong, but if you go in a different way, the distance may be wrong.

People can only walk how much distance in a day, once they can't judge the distance, it may delay the time of accommodation, causing a lot of disasters, because in the wild of this era, the outside is not calm, flowers and birds are fragrant, but all kinds of beasts that can eat people.

Different latitude zones, and different things, the north-south deflection are not something they can calculate, because they don't know the truth of the earth, and even no one in the whole country knows the truth of the earth.

Now that Fan Jingjing is here, she may know, but she is not a geography major, and she can only teach certain things from high school geography textbooks.

In her high school, the teacher didn't even open the textbook and take the class well.

However, until now, she has not taught this part to others, but has only recorded it in her own way.

She is still thinking about how to tell the people of this era how to really draw a map.

She was afraid that others would say gossip to confuse the public.

After all, with the new method of drawing maps, the accuracy is improved, otherwise the northern land in people's cognition will inevitably be too big, in fact, the northern land is constantly shrinking, and finally its area is larger than the halfway, but it is not much larger.

What's more, due to the geographical environment of many places, they cannot take advantage of it, although their environment is a large plain, a large plateau, because of the cold, even if there are minerals in this place, it is not easy to develop.

In fact, this geographical knowledge is very important in this era when geographical knowledge is very difficult to collect.

I have seen satellites, know latitude and longitude, and understand that the earth is round, which is logically a very advanced concept, but Fan Jingjing does not dare to share it with ordinary people.

Although she is correct, it is completely contrary to the traditional concept of Datang.

Although he has a lot of ways to prove it, but the interpretation method of this era makes him have no way to refute it, even if it is correct, in the face of so many literati, they can't say anything about their belief since ancient times, because Fan Jingjing herself is not a person who can debate, if there is a debate conference, even if he has the correct knowledge, there is no way to argue the wrong side, so she can only do it silently, and use the correct concept to explain that what she is doing is correct, So Fan Jingjing has been making maps and nautical charts during this time.

Making charts, if made with latitude and longitude, will be easier to get the right way than if you make them in other ways, but charts are not simple, because the sea has a lot of reefs and blocks that have not yet surfaced on land.

Some are ancient volcanoes, some are sedimentary sandbanks, but you can't see the bottom on the surface, in which case it is likely that if your boat is deeper, there is no way to pass through this place.

It is very particular how deep the ship is and which road it can take, so many waterways are studied after the ships continue to hit the bottom, and each waterway is a secret for every business.

Because of the process of exploring the waterway, I don't know how many ships have been damaged, so much money has been invested, since the merchant must recycle, otherwise even if he makes money, he will not earn more than others, and even the sailor must be a slave in the family, and the family must pay for the family, and even the whole family specializes in a certain business, Fan Jingjing has begun to train at sea to fish continuously since he knew that the children of Xun Gui took this group of people, and went to the direction of the big food, or the Russians, to make friends or develop, When she maintains a certain relationship, she knows that the opportunity to develop at sea may lie in these people, but if she lets them out like this, she is afraid that people will not be able to take them back.

Fan Jingjing wants to make them oppose each other, and when the time comes, they will develop in two directions, they can be said to be developing by force, this group of people taking the lead in bleeding should be more useful than using Liang Shu to lead in bloodshed, but these people can't be used to protect the core, but if you use people who have never seen blood, it is very unsafe to protect the core.

Therefore, Fan Jingjing is also ready to use this opportunity to mix Liang Shu's people with the people of Haicheng, so that they can learn some experience and lessons, as for whether they will learn bad from the people of Haicheng, Fan Jingjing doesn't know, she can only hope that the normal and correct way will have a relatively large influence.

Fan Jingjing believes that no matter what kind of influence, as long as there is enough management ability and enough restrictions, it can develop in a good place, and good students and bad students depend on whether the manager has any restrictions.

Restrictions, all people are good students, can not be restricted, the rest of the good students, the number will become very small, most of the people will go to the free-spirited way, free-spirited teaching efficiency, often very poor, teachers have no way to teach seriously, students have no way to study with peace of mind, often can only use the time to go home, to be able to make up for the homework, which is a full waste of time, so different teachers bring different influences to children, the impact is very far-reaching.

Now Fan Jingjing doesn't need to be a good teacher, when she is in the school, all learners will be quiet and let the teacher fully perform, because learning is really rare in this era, and no one is qualified to destroy, and these people have a rule in their hearts, destroying learning, destroying other people's learning, may offend people.

"All gone?" Fan Jingjing called Fan Qi and asked.

When Sun Erlang is not in the Fan Family Manor, who is qualified to undertake the Fan Family Manor, it is only Fan Qi, so Fan Qi will become very busy during this time.