What other natural compasses tell the direction?

1. On the edge of the forest, the mossy side of the rock is the north side, and the dry and bare side is the south side.

Generally speaking, snow melts to the south first and then to the north. If it is a pothole, the north faces the sun. Most rivers in the frozen soil area in the north are gentle on the north bank and steep on the south bank.

3. You can observe the caves of ants. Generally, the caves of ants face south.

You can find a stump at the edge of the forest. The width of the rings is south, and the tightness is north.

5. Look at the sun. It rises in the east and sets in the west. This method is feasible as long as it is not in high latitudes.

Compass compass, called Sina in ancient times, is mainly composed of magnetic needles installed on the shaft. Under the action of natural geomagnetic field, the magnetic needle can rotate freely and keep in the tangential direction of magnetic meridian. The south pole of the magnetic needle points to the geographical south pole (magnetic north pole), and the direction can be distinguished by using this property.

It is often used in navigation, geodesy, tourism and military affairs. The invention of the compass with physical direction indication has three parts, namely Sina, compass and magnetic needle, all of which belong to the invention of China. According to ancient mine records, it first appeared in the Cishan area during the Warring States Period.

Compass is the result of China ancient working people's understanding of magnet magnetism in long-term practice. As one of four great inventions of ancient china, its invention has played an inestimable role in the development of human science, technology and civilization. In ancient China, the compass was first used for rituals, etiquette, military affairs and divination, and to determine the orientation when looking at geomantic omen.