Compasses can be divided into two categories: relying on magnetic force and not relying on magnetic force. Compasses that rely on magnetic force can be subdivided into two categories:
1, a geomagnetic compass made according to the polarity of the earth's magnetic field, but the north-south direction indicated by this compass is different from the real north-south direction, and there is a magnetic declination;
2. Electronic compass adopts magnetic field sensor of magnetoresistive (MR) technology, which can correct the magnetic declination well and has been widely used in satellite positioning equipment. As for those who don't rely on magnetic force, they just rely on physical methods inside the equipment to indicate the direction, such as compass or inertial navigation system.
Purpose of compass: the north pole of compass points to the south pole of geography, which can be used to identify the direction. It is often used in navigation, geodesy, tourism and military affairs. Compass can be used to locate the direction, for example, in the wild or strange place, you can judge the direction.
In ancient times, the compass was used for ritual, military, divination and determining the direction when watching Feng Shui. According to relevant historical records, the compass began to be used for navigation from the end of the eleventh century to the beginning of the twelfth century. This opened a new era in the history of ancient navigation in China. Before the compass appeared, the ancients had
It is found that like magnets repel each other and opposite magnets attract each other.
Determine the position when divining feng shui.
The application of compass in navigation has greatly promoted the great geographical discovery and maritime trade.
The invention of the compass originated from the study of how the ancient people in China oriented, and also showed that the ancient people attached importance to how to orient. Therefore, the compass is known as one of four great inventions of ancient china.
In ancient China, compasses were used for military and maritime activities, and also for geomantic omen theory. Later, it was introduced to Europe, which played an irreplaceable role in European navigation and geographical discovery. In the invention of navigation technology, compass is also the most important single invention.