2065438+On August 6th, 2006 1 40, Mozi Quantum Science Experimental Satellite was successfully launched by Long March II carrier rocket in Jiuquan. China achieved quantum communication between satellite and ground for the first time in the world, and built a quantum secure communication and scientific experiment system integrating heaven and earth.
The reason why it was named "Mozi" is precisely because of the commemoration and memory of the great scientist Mozi. So what scientific achievements has Mozi made?
1. Mozi's achievements in physics
Newton's three laws are the core of mechanics. Although it has only a history of more than 400 years, it has promoted the development of the world scientific revolution. However, as early as 2000 years ago, Mozi had already put forward that "force, punishment (form) is also exciting." This is completely in line with Newton's first law that "force is the reason to change the motion state of an object".
In addition, a series of scientific achievements, such as pinhole imaging, direct light, light and shadow imaging and lever principle, which we know today, were first discovered and put forward by Mozi, who recorded all these achievements in Mo Jing.
The book records the earliest pinhole imaging experiment in the world in detail, expounds the principle of straight-line propagation of light, explains pinhole imaging phenomenon, and expounds the basic principles of plane mirror, convex mirror and concave mirror imaging. The lever balance, slope and buoyancy are also discussed.
As Joseph Needham said in China's History of Science and Technology, Physics Volume, Mozi's research on optics was "earlier than Greek as we know it, and Indian can't compare with it".
2. Mozi's mathematical achievements
Euclid, the father of geometry, was a figure who laid the foundation of European mathematics. His most famous work, Elements of Geometry, is the foundation of European mathematics. He put forward five postulates, Euclidean geometry, which is widely regarded as the most successful textbook in history.
Compared with Euclid, Mozi's mathematical achievements are not inferior at all. His definitions of time, circle and square were all put forward before him. "Double is two." "Well, one is as long as the other." ..... These Mo Jing have detailed records and explanations.
Mozi not only summed up all the concepts of point, line, surface, body and circle, but also invented the decimal algorithm, which was a great contribution of China to world civilization. China widely used decimal notation as early as Shang Dynasty, and Mozi was the first scientist to summarize and expound the concept of value system. Imagine that if there is no decimal system, one kilogram is not equal to twelve, and one meter is not equal to ten meters, then these world-wide unified conversion units are estimated to be gone.
Mo Jing has many geometric propositions, such as the distance between two parallel lines is equal, two points determine a straight line, the radius of the same circle is equal, and the four corners of a rectangle are right angles.
3. Mozi's cosmological achievements
Mozi believes that the universe is a