Where is the address of Sinandou Industrial Park?

The specific address of Sibei Beidou Industrial Park is No. 618, Chengliu Middle Road, Jiading District, Shanghai.

Smooth mirror-like chassis made of bronze.

For details, please see the following introduction:

Sinan is the earliest compass invented in the Spring and Autumn Period and the Warring States Period in China, and it is not a compass.

As early as more than 2,000 years ago in the Han Dynasty (206 BC and 220 AD), the Chinese discovered that a stone on the mountain had the magical property of absorbing iron, and found that a long stone could guide the north, and they called this stone magnet. Ancient skilled craftsmen polished and chiseled the magnet into a spoon shape, placed it on a smooth mirror-like chassis made of bronze, and cast it with directional carvings. When this magnetic spoon stops rotating on the chassis, the direction of the spoon handle is due south, and the direction of the spoon mouth is due north, which is the world's earliest instrument invented by our ancestors to indicate the direction, called Sinan.

Sinan's "division" means "to point".

According to the records in the book "Han Feizi" in the Spring and Autumn Period and the book "On Balance" written by the thinker Wang Chong in the Eastern Han Dynasty, as well as the research of modern scientific stone examiners and the Sinan model made, it is shown that Sinan is made of natural magnets (known as Cishi in ancient times, and the phenomenon of magnet iron absorption is described with love) to make a soup spoon, and its spoon handle indicates the south. In the Spring and Autumn Period and the Warring States Period, there are records about Cishi in the book "Guanzi" and "The Classic of Mountains and Seas", and in the book "Guiguzi" and "Lü's Spring and Autumn Period" in this period, there are further records of Cishi absorbing iron. This is arguably the earliest magnetic compass in ancient times, and Sinan's model is now on display at the Chinese History Museum in Beijing and many other museums.

It is said that the Yellow Emperor (about the 47th century BC) and the Duke of Zhou of the Western Zhou Dynasty (about the 21st century BC) made and used the guide car, but after later literature research and model making tests, it has been proved that the guide car has nothing to do with the compass, and the guide car after the Han Dynasty relied on the mechanical structure rather than the magnetic guide. A model of a guide car is also on display at the Chinese History Museum in Beijing.

Sinan Navigation is committed to the research and development of high-precision satellite navigation differential positioning technology, based on the Global Navigation Satellite System (GNSS) and its augmentation system, to provide customers with real-time positioning accuracy of centimeters, decimeters, sub-meters of high-precision satellite navigation and positioning chips, core boards, receivers and data communication products and system solutions.

Navigation is a tool to identify the coordinates of the map through satellite positioning, Sinan navigation or Sinan needle navigation is a car GPS navigation tool.

Sinan navigation is very bad, the product can't stand the test and false publicity.

Do Beidou satellite receiver motherboard and Beidou application industrialization, GPS + Beidou dual system RTK motherboard, deformation monitoring and other applications. I'm Sinan's, Duan Gong.

Companies that do the core technology of high-precision satellite navigation, from chips to boards to receivers to system solutions, do everything, mainly with leading technical advantages.

The earliest Beidou high-precision strength company in China.

Previously used his house. The experience is good, and it is a big brand in China.

Sinan is the compass in ancient China, one of the four great inventions of China, a long time ago, China used Sinan for navigation in ancient times. In order to commemorate this great invention, the English name of China's second-generation Beidou satellite navigation system also adopts compass.

In addition to the Beidou second-generation satellite navigation system, the Global Navigation Satellite System (GNSS) also includes the GPS of the United States, the GLONASS of Russia, the Compass of China, and the Galileo of the European Union. At present, China's Beidou II has been built as a regional navigation system.

In addition, there is also the company's abbreviation Sinan Navigation, that is, Shanghai Sinan Satellite Navigation Technology, the company's main business is high-precision GNSS receivers and boards. As the name suggests, the company's specialty is Beidou high-precision satellite navigation, and its core product is the K series centimeter-level high-precision OEM boards, and its competitors are mainly Trimble in the United States and Novatel in Canada.

There is a debate on this issue, or there is a problem with the modern understanding of ancient books. For Sinan's recovery, it is unreliable.

The reason why the model can indicate north and south is because tungsten steel is used for magnetization. And tungsten steel is a material that was unimaginable in ancient times. The most reasonable explanation for Sinan in the ancient book is ---Sinan, which refers to the Big Dipper.

Now the Chinese History Museum no longer displays this model of Sinan. I'm afraid of being laughed at by the whole world.

Sinan was invented by the people of our country during the Warring States period to point out the direction, and it was widely used in navigation during the Song Dynasty and developed the compass. Later, it spread to Arabia and greatly contributed to the development of the world's maritime industry.

The traditional view is that Sinan is one of the earliest compasses invented by the working people of China during the Han Dynasty and even the Warring States Period, which indicates the direction of the north and south.

I haven't used it yet, but Sinan may be able to receive Beidou signals, presumably RTK will be better used, because there are more satellites received.

All-in-one board, small machine, support Beidou, good signal, have been used.

The domestic RTK boards of Southern Surveying and Mapping are provided by Sinan, Sinan has core technology, RTK quality is also very good, the star search is very fast, and I feel much better than other brands!

This instrument is rubbish, there are a lot of problems, and the technology is not mature.

Choosing a unit is always a struggle. The key is that the development of units and individuals cannot be determined, and it is difficult to make trade-offs. So I'll help you analyze it, but the final idea is to take it yourself.

If you are sure, even if you don't develop well in the future, you can't regret it, because maybe it's still the same (or worse) to another company, there are environmental factors and opportunities for the development of work, but the premise of doing well is that you work hard.

Nanfang Surveying and Mapping is a veteran R&D and service company of surveying and mapping instruments and software, and its total station, GPS and other products and tools and software such as mapping and surveying and mapping calculation are in the forefront of China's surveying and mapping industry. If you enter the company for development, the environment is good, the company has a certain reputation, the work should be very smooth, and the work is very mature. The specific amount of income depends on the level of effort and which branch you are in.

Sinan navigation company, which is characterized by focusing on independent innovation of core technology, breaking a number of foreign technical barriers, breaking through the key technical bottlenecks such as high-precision GNSS signal reception, joint positioning, core algorithms and productization, in the field of high-precision GNSS can provide core motherboards and solutions, research and development in Beidou and other aspects are also very good, compared to the south of surveying and mapping, this is a new company, if you work there, you will get more opportunities to exercise, the company will develop well in the future, your qualifications are higher than those who go later, Therefore, the follow-up development is promising.

If you value development, you can go to the latter, and if you value the present, you can go to the former.

In addition, the specific job will be assigned to you by the company, and it may not be possible to determine it now. You can also personally inquire about the salaries and specific work conditions of the two companies (do you travel a lot?). Travel allowance?

Dormitory occupancy, etc. But don't dwell on these, because the company is looking at whether you can endure hardship. Managers think:

The staff must not be picky, otherwise it will ......）

Unlike most people, I prefer Sinan. Sinan mainly does Beidou board products, here you can choose military or civilian products, their products are one of the best products in China to do Beidou RTK, although not as good as Novatel products, but also very stable, I am from the perspective of partners, and their Wang Zong cooperation feels very good. Personally, I think their products are very competitive in the industry.

I think that if you choose to find a job, you should look at the treatment, don't be fooled by the prospects that the people in the company say, and only when you get it is reliable.

Personally, I think it is the southern surveying and mapping, and there are many opportunities in all fields of large companies.

There is no Han Dynasty Sinan physical object. Sinan is likely to be non-existent.

There is "Sinan Ladle, cast on the ground, its guide to the balance". Therefore, Mr. Wang Zhenduo believes that Sinan is a magnetic spoon, which is the most important evidence of Sinan's magnetic spoon. But the ladle has a second pronunciation, pronounced biao (same standard), referring to the three stars of the Beidou handle, also known as Yuheng.

The Ganshi Star Sutra has "The three stars are jade balances.""。Therefore, Mr. Liu Bingzheng believes that Sinan in "On Balance" should be interpreted as Beidou, when the spoon handle of Beidou in Beitian points to the ground (north), the two stars at the bottom of the spoon point to the south.

One of the evil jades of the Han Dynasty, there are few surviving in the world.

Sinan first appeared in the area of Cishan in Hebei during the Warring States Period. According to the records of "Guanzi" and "Lü's Spring and Autumn" written at the end of the Warring States period more than 2,000 years ago, the Chinese discovered that a stone on the mountain had the magical property of absorbing iron, and they called this stone Cishi.

The magnetic guide characteristics of Sinan are based on the records of "Sinan's ladle, cast on the ground, and its guide guide" written by Wang Chong, a famous historian of science and technology in China, according to the book "Han Feizi" in the Spring and Autumn Period and the "On Balance" written by Wang Chong, a thinker in the Eastern Han Dynasty.

The south pole (S pole) of the magnet is ground into a long handle, placed on a smooth mirror-like chassis made of bronze, and then cast with directional engravings. When this magnetic spoon stops rotating on the chassis, the direction of the spoon handle is due south, and the direction of the spoon mouth is due north, which is traditionally considered to be the world's earliest magnetic guide instrument, called Sinan. Among them, "division" means "to refer to".

Sinan. Among them, "division" means "to refer to". According to Wang Chong of the Han Dynasty "On Heng Shi Ying":

Sinan's ladle, cast into the ground, its guide. The traditional view is that Sinan is the earliest compass invented in the Han Dynasty and even the Warring States Period in China to indicate the direction of the north and south.

But this view has been questioned by academics. believes that in "On Balance", it is not pointed out that Sinan is a magnetic spoon. According to the latest literature research, Sinan is another name for the Beidou in the sky.

Now the Chinese History Museum in Beijing no longer exhibits Sinan's model. The argument that Sinan is a magnetic guide tool is far from sufficient. It is also believed that according to Tang Dai Shulun's "Gift to Xu Shanren", "the needle is from the guide to the sky, and the stars are still arching north and the night is long."

It is proposed that China may have invented the compass in the eighth century.

If it is to answer the exam question, it will be based on what is written in the history book.

Sinan first appeared in the area of Cishan in Hebei during the Warring States Period.

More than 2,000 years ago during the Warring States period.

Sinan was first seen in "Guiguzi"."The record of "Zheng Renzhi takes the jade, carries the car of Sinan, and is not confused", to the effect that "Zheng Guo."

People pick jade, and they have to be loaded on Sinan's car, so as not to get lost." Later in "Han Feizi"There is a degree"; "The first king established Sinan to end the day and night" to the effect that "the previous kings set up Sinan in order to determine the morning and evening." Wang Chong in the Eastern Han Dynasty.

In the "Discussion of Balance is Ying", it is said: "The ladle of Sinan, cast it on the ground, its guide to the truth", to the effect that "put Sinan on the ground, and the tail of the spoon on it points to the south." The late Mr. Wang Zhenduo, a scientific and technological archaeologist, based on Wang Chong's "On Balance"The twelve characters of "Yes Ying" designed the Sinan restoration model, which is the National Museum of China.

Collection. For a long time, Sinan has been considered an important discovery in the history of ancient Chinese science and technology.

Sinan is the compass.

Why is it made in the shape of a spoon? The spoon-shaped sinan is a waste of materials, cumbersome and difficult to carry, time-consuming and labor-intensive to grind, and inconvenient to use. Therefore, Changfeng asked his daughter:

How did the ancients discern directions? "My daughter said to tell the direction by the sun or the stars. "Which star?

Polaris. Speaking of this, the daughter immediately said happily: "This is the reason why Sinan's spoon handle points to the north, because only the North Star is always in the northern sky, and its direction is the only constant, so when the ancients made Sinan, they naturally made its spoon handle point to the north." "Then why did Sinan make it spoon-shaped?

The daughter thought about it for a long time, and the wind reminded again: "What is around the North Star?" "It's the Big Dipper.

Oh, I see, the Big Dipper is spoon-shaped, that's why the ancients made Sinan spoon-shaped! ”

The ancients naturally thought that there was some connection between the spoon-shaped shape and the North Star, so they ground the magnet into a spoon-shaped, which is rooted in our ancestors' long-standing idea of "law of heaven and earth", that is, to act according to the laws of movement of heaven and earth. The North Star played a huge role in ancient astronomy in China, and the ancients called the North Star a purple microstar.

The ancients believed that the North Star does not move, and all the stars revolve around it, and it is the leader and representative of all the stars, so it is also called the Emperor Star.

The process of the ancients' invention of Sinan tells us that if you recognize a natural phenomenon, you can not consider what the principle is, you might as well imitate it first, see if it can achieve the same effect, and try to find the use of new things, so that people can use it, and bring convenience to people's lives, this is invention. Edison in the United States.

Didn't you have much advanced scientific knowledge, didn't you also become the greatest inventor? Are you among the giants who are changing the face of the world? To put it bluntly, he didn't consciously or unconsciously act in accordance with the practice of the ancients in our country of "law rules heaven and earth".