What other natural compasses are there?

You can find a stump to observe. The annual rings are wider to the south and denser to the north, because the growth in the south is faster than that in the north, and the annual rings are more widely spaced.

2. Rock

Where there are many rocks, you can also find an eye-catching rock to observe. The mossy side of the rock is the north side, and the dry and bare side is the south side.

3. the sun

The sun moves from east to west and the shadow moves from west to east. At 6 o'clock in the morning, the sun rises in the east, and the shadows of all objects fall to the west. At noon 12, the sun is due south and the shadow points to the north. At 6 o'clock in the afternoon, the sun is due to the west and the shadow points to the east.

4. Snow

In spring, the snow melts first to the south and then to the north, while the potholes and depressions in the north melt into the sun earlier. Most rivers in the frozen soil area in the north are gentle on the north bank and steep on the south bank.

5. Ant Cave Gate

Because the habits of ants are different from other insects and animals, they generally prefer sunshine, so the doors of ant holes are all facing south, so they can tell the direction.

Extended data:

Compass is one of the four great inventions in ancient China. The invention of compass should be the result of gradual improvement in a very long time, and the forms in different periods should appear in different forms.

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 north pole of the magnetic needle points to the geographical south pole, and this property can be used to identify the direction.

Compasses are often used in navigation, geodesy, travel 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.

References:

Baidu encyclopedia-compass