What Does Nature's Compass Have?

- Jul 29, 2019-

In the country activities, the compass may be damaged or lost. At this time, some characteristics of nature should be used to determine the direction. Special attention should be paid to the comprehensive analysis of the specific situation.

Because the earth orbits and the rotation of the earth is counterclockwise, the sun rises from the east, rises to the highest point at noon at noon, and falls to the west in the evening. It should be noted that due to the tilt of the earth's axis, the sunshine duration varies from season to season, and the time of sunrise and sunset may deviate.

1, the sun

A. Insert a wooden stick or a straight branch on the ground, and make a circle centering on the bottom of the straight rod (O point). Make a mark with the shadow of the straight rod at a certain time in the morning, and mark the intersection with the circumference (point A). The shadow of the straight rod in the afternoon intersects the circumference again, and is marked (point B). The line connecting the two marks is the east-west direction. The midpoint of the line is straight to the south and the other end is north.

B. Using the surface and the sun (there are three methods)

Place the needle watch flat on the tip of the hour hand, place a young branch (or matchstick) vertically, turn the watch, and make the shadow of the young branch overlap with the hour hand, indicating that the hour hand is pointing to the sun, while the hour hand and the surface number 12 The angle between the angles is the south.

Lay the watch flat, with a young root (or matchstick) standing at the center of the surface, turn the watch to overlap the shadow with the hour hand, and the angle between the hour hand and the surface number 12, the bisector angle points north.

2, the moon

The moon is the only satellite of the earth. Its light is the reflection of the sun's rays. Because its operating position is in different directions, the surface of the light is often changed. We see that the moon rises from the east, the west falls, and the spherical surface has a sphere, a semicircle, and a bend. Different images such as the month are called "moon phases." The change of the moon phase has a certain regularity in time and direction of appearance, so as long as you know the moon phase and time, you can find the direction.

3, trees

It is generally believed that the branches and leaves on the south side of the trees are denser and the north side is sparse; or the interval between the north side of the annual ring is dense and the interval between the south sides is large, but in fact, these two methods are not necessarily accurate, because the dense branches and leaves are not necessarily in the south, but in One side of free space, and is influenced by the sun and the wind.

4, constellation

In addition to the moon at night, you can use the constellation to determine the direction. Finding Polaris is the most commonly used method.

The first thing to do is to find the Great Bear Constellation (commonly known as the Big Dipper) because it always rotates at a certain distance from the Polaris. After finding the Big Dipper, follow the line connecting the two stars A and B on the edge of the spoon and extend in the direction of the spoon. It is about five times the interval between the two stars A and B. One brighter one is the North Star.

In the area south of 40 degrees north latitude, the Big Dipper often turns below the horizon, especially in the winter evening. At this time, the Polaris should be searched according to the constellation constellation opposite the Big Dipper. The Cassiopeia Constellation consists of five stars with similar brightness to the Big Dipper, forming a "W" shape, which is about twice the width of the entire gap in the middle of the "W" gap, which is where the North Star is.

In the south of 23 degrees north latitude, the Southern Cross can be used to distinguish the direction in the first half of the year. The Southern Cross is composed of four bright stars, diagonally connected to form a cross, extending along the line connecting A and B, about A. Four and a half times the distance between the two stars of B, that is, the south.