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Chapter 437 Really twelve meters

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    Not to mention Fang Xuanling, even the scholars next to him were stunned!

    No one else can answer this!

    "Isn't this question too difficult, Mr. Zhao?"

    "That's right. It's impossible to answer this question. There will definitely be errors."

    Those scholars shook their heads one after another. How far could we know such detailed data?

    But what I didn't expect was that Ding Feng said loudly: "Teacher, I walked a total of twelve meters."

    Fang Xuanling looked at Zhao Chen dubiously: "Mr. Zhao, is it really twelve meters?"

    "Wouldn't you know if you just measure it? Come on, put on the measuring tape!"

    Zhao Chen opened the folding fan, the clouds were light and the wind was gentle.

    Everyone around was looking at it curiously. Could it be that this was really an exact distance of twelve meters?

    Soon, they saw geography students who actually took out a very long scale, like a ruler, which was five or six meters long. Some students also took out ink rope markers and pulled them out.  Straight line, then start measuring.

    "This is a ruler?"

    Fang Xuanling asked curiously.

    "Of course, this is a ruler made by a craftsmanship workshop, that is, a ruler. One hand is five meters long. The scale is also based on the revised standard, which is divided into meters, decimeters, centimeters, and kilometers.  .¡±

    Fang Xuanling looked at the busy geography students and couldn't help but ask: "Sir, can this geography major be used for anything other than sending people to the Western Regions or other places in the Tang Dynasty for surveying and mapping? I mean, from now on they should not  Can this one play other roles?¡±

    "That's natural." Zhao Chen smiled, "Old Fang, think about it, the government is very busy cleaning up the fields every year. My students from the Department of Geography can also help clear the fields. They can clearly calculate the area of ??each acre.  , in this way, wouldn¡¯t it be clear at a glance how much the subsidies are for good and bad fields?¡±

    Fang Xuanling thought for a while: "It seems to make sense."

    Zhao Chen opened the folding fan: "But don't worry, at least the map surveying will not be completed within more than ten years, and it will not be completed within several decades."

    As long as the Tang Dynasty developed, its geographical appearance would be constantly updated.

    At the same time, the students who measured the distance also finished measuring, raised their heads and said, "Mr. Zhao, the total is twelve meters."

    "What?!"

    The surrounding scholars and Fang Xuanling were all shocked. Is it really twelve meters?

    Zhao Chen smiled and said: "Geography students adopt a standardized pace. They are specially trained to walk every day. It is not difficult to estimate how many meters they walk with each step and how many steps they will take next.  "

    Fang Xuanling felt that her forehead was covered with sweat: "Isn't this difficult?"

    Who in the right mind would keep track of how many steps he has taken?

    The scholars around him were whispering, and Zhao Chen turned his head and glanced at Fang Xuanling: "Old Fang, you want to ask what's the use of this, right?"

    Fang Xuanling nodded repeatedly: "Yes, I have memorized this step distance, but it seems useless."

    "Why is it useless?"

    Zhao Chen closed his folding fan: "If we estimate the approximate distance from Datang to Gaochang, and then measure the marching speed of the horses, can we accurately calculate how many days it will take for our Datang army to reach Gaochang?"

    Fang Xuanling was stunned. This seems to make sense.

    ¡°A good map has three elements. The first is accuracy, the second is distance, and the third is direction reference. If converted into professional language, they are mathematical elements, geographical elements and decoration elements.  Do you understand?"

    Fang Xuanling looked confused: Who am I and where am I?

    "It's okay, I know you didn't understand, Ding Feng, please bring it up and see if you have completed the homework you were asked to complete before."

    "Yes." (Remember the website address: www.hlnovel.com
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