Why does a compass help us find our way?

A compass is a simple instrument used to determine directions. The predecessor of the compass was Sinan, one of the four great inventions of ancient China. The main component is a magnetic needle mounted on a shaft that can be rotated freely.

The magnetic needle can remain in the tangent direction of the magnetic meridian under the action of the geomagnetic field. The north pole of the magnetic needle points to the north pole of geography, and the direction can be discerned using this performance. It is commonly used in navigation, geodesy, travel and military applications.

A compass is a compass when it is not broken. Then you can know which direction you should go according to the principle of going up, north, down, south, left, west, right, east.

Because it always points in one direction, and if you follow that direction, you won't get lost.

You get lost because you don't have a direction, but you go around in the same place.

The earth is a big magnet, the direction of the magnetic field is north and south, under the geomagnetic field, our small magnetic needle (compass) attracts the same pole with it, and repels the opposite pole, pointing north and south.

Because the compass can let you know the direction, for example, you know that your home is in the south, you should not go north, but how can you know which direction you are going in an unfamiliar environment, the compass tells you!

Because the south pole of the earth has a magnetic north pole, according to mutual attraction, the south pole of the degaussing needle is thus the south pole, so the direction can always be discerned.

Because no matter how it changes, it will always point to the north and never waver, and as long as you continue to go like this, you will eventually get out of the predicament.

Because it works on the geomagnetic field, the geomagnetic field does not change.

Magnet Principle The north pole of the magnetic needle points to the north pole of geography.

If you know the south, you will know the be, not to mention the things.

Compass. The reason why it can point to the direction is because the earth itself is a huge magnet, its north and south poles are at the ends of the earth, according to the law of interaction between the magnetic poles, the north pole of the compass and the south pole of the geomagnetic field attract each other, and the south pole of the compass and the north pole of the geomagnetic field attract each other. When the compass is stationary, its north pole points to the north end of the earth, and the south pole points to the south end of the earth, thus guiding people in the direction.

The compass is one of the four great inventions of ancient China.

One of them, called Sinan in ancient times, is composed of Sinan, a compass and a magnetic needle. The main component of a compass is a magnetic needle mounted on an axis, which is in the natural geomagnetic field.

It can rotate freely under the action and remain tangent at the magnetic meridian.

In terms of direction, the south pole of the magnetic needle points to the geographic south pole (the north pole of the magnetic field), and this performance can be used to distinguish the direction, and it is often used in navigation, geodesy, etc.

The application of the compass in navigation to the great geographical discoveries.

and the sea ** has a great promoting effect. The ancient Chinese used the compass for military and navigational activities, and was also used for Kanyushu, and later introduced to Europe, playing an irreplaceable and important role in European navigation activities and geographical discoveries. Among the inventions of nautical technology, the compass is also the single most important invention.

How to use a compass?

Proper use of the compass requires staying away from items that generate magnets, such as cars, barbed wire, and high-voltage wires.

etc., and the distance is best kept above ten meters, otherwise it will affect the accuracy of the compass results, in addition, the compass should be kept horizontal when placing it, otherwise it is easy to cause the error of the compass results, and the north and south positions can be seen after the pointer stops swinging.

In addition to the compass, there are the following things to discern the direction: growth rings, bamboo, Southern Cross.

1. Growth rings: The denser end of the growth ring is the north, and the opposite is the south.

2。Bamboo: The greenish side of the bamboo body is facing south, and the greener side is facing north.

3。Southern Cross: The Southern Doji, sometimes visible at night in areas south of latitude 23°30 N, consists of four brighter stars, shaped like a "ten", in the lower right of which is due south by four and a half times the length of the two stars (no star).

Principle: The interaction between the magnetic poles, the magnetic poles of the same god key name repel each other, and the magnetic poles of different names attract each other. The earth itself is a huge magnet, called the geomagnet, the south pole of the geomagnet is near the north pole of geography, and the north pole of the geomagnet is near the south pole of geography.

Usage: Put the compass flat, do not interfere with the magnetic field around the jujube reed, wait for the pointer to stop swinging, look at the pointer, the south and north pointing directions are north and south; If n and s are marked, then n is north and s is south.

Features of the compass:

People deduce that the earth has a magnetic field based on the fact that the compass can guide north on the earth's surface, which is called the geomagnetic field. The magnetic field of the earth is very similar to that of a bar magnet.

According to the characteristics of the small magnetic needle n pole pointing northward, people analyze the direction of the geomagnetic field from south to north, which concludes that the n pole of the geomagnetic field is extremely close to the geographic south pole, and the s pole of the geomagnetic field is near the geographic north pole, and the geomagnetic north and south poles are opposite to the geographic north and south poles.

In order to understand this interaction between magnets, the concept of magnetic fields was introduced. A magnetic field is an invisible and intangible substance that exists around a magnet, and the action of this substance is a powerful force on the magnet.

That is to say, one magnet will generate a magnetic field in the surrounding space, and this magnetic field will have a strong effect on the other magnet. If you place a bunch of small magnetic needles around a magnet, then the n-pole of the small magnetic needles will be pointing in the same direction as the magnetic field. That is to say:

Outside the magnet, the magnetic field is directed from the n pole of the magnet to the s pole of the magnet.

1.San'in south, Sanyang north. 2.

Annual ring. 3.Ant burrows.

4.The Big Dipper. 5.

Sunlight. 6.Sun.

7.Moss. 8.

Polaris. 9.The wild goose flies southward.

10.The shape of the moon, how bright it is, how bright it is. 11..

Melting of snow. 12.Single plant.

13.Extrapolated from the terrain.

1.San'in south, Sanyang north.

The shady side of the mountain is southern, and the vegetation is generally dense. The sunny side of the mountain is northern, with sparse vegetation and a lot of sand and gravel.

2.Annual ring. The wide rings face south, and the dense ones face north.

3.Ant burrows.

Observe the ant's burrow, the entrance of the cave is mostly facing south.

4.The Big Dipper.

At night, the stars are connected in the shape of a spoon and point north.

5.Sunlight. At noon, a pole is erected vertically, and there is no shadow when the sun is upright at noon, and as time goes by, the sun will slowly turn westward, and the direction of the shadow at this time is east.

6.Sun. Use a straight stick and the sun to determine your bearings.

The main method is: use a straight rod (straight wooden stick) to make it perpendicular to the ground, and place a stone at the apex a of the shadow of the straight rod; After about 10 minutes, when the apex of the shadow of the straight rod moves to b, another stone is placed. Connect the two points A and B into a straight line, and the direction of this line is the east-west direction.

The direction perpendicular to the AB line is north-south, and the end of the line towards the sun is south.

7.Moss.

You can also look for a striking rock to observe in a rocky area, with the north side of the rock covered and the dry and bare side on the south side.

8.Polaris.

Polaris is a brighter star in the sky due north, and if you find it at night, you find true north.

9.The wild goose flies southward.

10.The shape of the moon, how bright it is, how bright it is.

Upper Upper West West: Winding up to the middle of the night, the first half of the moon, the first quarter of the moon, the moon is in the west, and the bright side is facing west.

11..Melting of snow.

The place where the snow melts is facing south.

12.Single plant.

The lush side is south, and the sparse and withered side is north.

13.Extrapolated from the terrain.

If in our country, the topography is high in the west and in the east, it can be considered together with the flow direction of the river, so as to derive the direction.

It can be considered in conjunction with the direction of the river to derive the direction.