How to tell the direction in the absence of the sun

Looking at the leaves, the dense direction is southeast.

1. Use the compass to identify the prescription. The fastest way to tell the direction with a compass is to place the compass horizontally, and when the magnetic needle is stationary, the end marked with "n" refers to the north. Although this method is simple and quick, there are two things to be aware of:

One is to try to keep it level; The second is not to get too close to magnetic materials.

2. Use the straight rod to determine the direction. In the wild, one can stick a straight pole (such as a longer branch) into the ground so that it is perpendicular to the ground, and first place a stone at the apex of the shadow of the benchmark; After about 10 minutes, place a stone on the new benchmark shadow vertex as the b place. Connect the stones at A and B into a straight line, and the straight line points in an east-west direction.

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

3. Use the analogue watch to determine the direction. The watch is placed horizontally, halved by halving the number of hours (24-hour format) towards the sun, and the direction indicated by the 12 o'clock scale on the frontogue dial is approximately north.

4. Use the North Star.

Determine the direction. There is no sun at night, which can be judged by the North Star. Find the easily recognizable Big Dipper first.

Ursa Major) or W (Cassiopeia), you can find the North Star very quickly. The Big Dipper are seven brighter stars shaped like a spoon. The constellation of Cassiopeia is composed of five brighter stars, shaped like the letter "W", extending from the opening of the letter about twice the width of the opening of the letter.

5. In addition, you can also use various features to determine the orientation and use it flexibly according to different situations. For example, the main entrance of ancient temples usually opened to the south; Solitary trees usually have dense foliage and smooth bark on the south side; The ring lines on the stump are usually sparse in the south and dense in the north; Large rocks, mounds, and trees are densely planted in the south, and moss is easy to grow in the north; If it is a snowy winter, buildings, mounds, ridges.

Snow cover in the highlands usually melts quickly in the south and slowly in the north.

There are two ways to rely on the sun to determine direction.

1. The sun rises in the east and sets in the west, which is the most basic way to identify the direction.

2. It can be measured by the shadow method of the wooden stick, when the sun is enough to form a shadow, erect a straight stick (more than 1 meter) on the flat ground, and put a stone (or other marking) at the top of the shadow of the wooden stick, and the shadow of the wooden stick will move with the movement of the sun.

30 60 After the bell of the tauchi, another stone was placed on the top of the shadow of the stick. Then draw a straight line between the two stones, and in the middle of this line a straight line that intersects perpendicular to it. Then step on the first marker point with your left foot and the second marker with your right foot.

At this time, the front of the person standing is due north, the back is due south, the right hand is east, and the left hand is west.

Use the sun to discern direction.

The reason why the sun can be used to discern direction is because of the specific relationship between the earth and the sun. The Earth rotates once every 24 hours, so it's as if we're seeing the sun moving in the sky.

Simply use the sun to estimate the direction:

We see the sun moving from east to west in the sky, rising in the east in the morning, passing due south at noon, and setting in the west in the evening. That is, over the course of a day, the Sun will rotate 15° per hour from east to west over time, passing south from east to west and setting from west, and we can infer the angle at which the sun is moving based on the time.

For example, on the day of the vernal equinox (around March 21), day and night are of equal length. The sun rises in the east at 6 a.m., due south at 12 noon, and sets in the west at 6 p.m. Now the time is 10 a.m., 10-6 = 4, 4x15° = 60°, then the current orientation of the Sun is 60° south-east.

Use the stick shadowing method to determine the direction:

1. On a sunny day, find a piece of flat ground, insert an upright small wooden stick (at least one meter long) to make it perpendicular to the ground, find out the projection position of the wooden stick at this time, and make a mark.

2. Wait at least 15-30 minutes, then find out the new projection position of the stick and make a second mark.

3. Connect the two markers with a straight line, which roughly points east-west (the first mark is always west of the second mark).

4. Now make this line parallel to your shoulder, the first one is marked on your left side, and the second one is on your right side, and the direction you are facing is due north.

Special note: The higher, thinner, and perpendicular the straight rod is to the ground, the longer the shadow moves, and the more accurate the direction line is measured.

For those who live in the Northern Hemisphere, depending on the time of day and the position of the sun, in general, the sunrise is in the east (or slightly south), at noon is due south, and the sunset is in the west (or south).

Depending on the season, the position of the sun changes slightly: after the vernal equinox, the sun moves slightly northward; After the autumnal equinox, the sun moves slightly south.

In addition, it is also related to the geographical longitude you are in. Because Beijing time is not the time of Beijing (east longitude, but the local time of 120° east longitude. (120° east longitude just through Hangzhou).

So, if your geographic location is west of Hangzhou, at 12 noon Beijing time, the sun is a little east-south; On the contrary, it is a little south-west.