How to distinguish between southeast and northwest?

How to distinguish between southeast and northwest?

Get up in the morning and face the sun. The front is east, the back is west, the left is north and the right is south.

You can find a stump in the forest and tell the direction according to its annual rings, because its annual rings are always wide in the south and narrow in the weak side; You can observe an independent tree with lush foliage on the south and sparse foliage on the north. You can tell the direction according to the ant's cave. Because most of the female ants' holes face south; 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. On a starry night, we can tell the direction according to the stars: first find the Big Dipper in the sky, along its "spoon handle", find the sixth and seventh stars, and connect the two stars into a straight line according to the mathematical principle of determining a straight line at two points, and find a brighter Polaris on the extension of this straight line. From the "spoon handle" to the brighter Polaris, it just points out the direction from south to north. If it is in winter, the part of the snow that is difficult to melt always faces north because of the sunlight. In addition, there are temples, pagodas and generals' houses, all facing south, while the gate of the * * * temple taught by * * * faces east. In addition, Polaris is used to judge the direction, the natural wind direction in each season, the surface morphology of desert dunes and so on. The discrimination of direction should be analyzed in detail and judged comprehensively.

On a clear day, according to the sunrise and sunset, you can easily know the east and the west, and you can judge the profile, but it can only be a rough estimate. There are the following methods to determine more accurately:

1, watch direction finding "hours are half of the sun, 12 refers to the north". Generally, you can quickly identify the direction between 9: 00 am and 4: 00 pm, and the direction you point to half the time is facing the sun, and 12 is the north. For example, in the afternoon 14:40, half is 7: 00. Or put a watch, put a stick in the center of the watch to turn the watch, so that the shadow of the stick coincides with the hour hand, and the bisector between the hour and 12 is the north. The earth rotates 360 degrees in 24 hours, so 1 hour is 15 degrees, while the watch rotates 360 degrees is 12 hours, which is 1 times faster than the sun, so that the position can be roughly determined by the watch and the sun. At 6 o'clock in the morning, the sun is in the east and the shadow points to the west. When the hour hand 6 of the dial points to the sun, 12 on the dial points to the west. If the dial is rotated 90 degrees, that is, 6 divided by 2 equals 3, then 3 points to the sun, and at this time 12 refers to the north; Similarly, at noon 12, the sun is in the south. Divide 12 by 2 to get 6,6 points for the sun and 12 points for the north. The disadvantage of this method is that it is best to consider the local time difference and avoid azimuth deviation, but it may be used as a simple judgment of approximate azimuth.

It must be pointed out that:

(1) When judging the direction, the watch should be flat;

(2) In the area between 20 30' south latitude, it is not suitable for use around noon, that is, every 15 plus 1 hour in the east and every 15 plus 1 hour in the west.

The direction of the sun shadow is sunny, and a wooden stick is erected on the ground. The shadow of the stick moves with the position of the sun. These shadows are the shortest at noon, the connecting line at the end is a straight line, and the vertical line of the straight line is the north-south direction.

Draw a series of concentric circles on a piece of 50×50cm drawing paper, with the radius of concentric circles increasing by 1cm, nail them horizontally on a flat plate, and vertically insert a thin steel needle or needle with a length of 12- 15cm on the center of the circle. When the position of the sun changes, the endpoint of the shadow always intersects with the concentric circles. Draw these points, then connect two straight lines on the same circle, and connect the midpoint of these straight lines with the center of the circle. This connecting line is the north-south direction line, and the direction of the arc top is the north.

3. Night Star

At night, you can judge the direction according to Polaris and Southern Cross.

1, Polaris is located in the northern sky, and its exposed altitude angle is equivalent to the local latitude. Based on this, you can find Polaris quickly. Usually according to the Big Dipper (Ursa Major) or the W Star (Fairy Queen).

The Big Dipper is seven bright stars, shaped like a spoon. The place where the two β -α directions of the spoon extend about 5 times is Polaris.

When you can't see the Big Dipper, you can look for the North Star according to the constellation W after Fairy.

Cassiopeia consists of five bright stars, shaped like a "W" letter, and the distance between the opening direction and the opening width of the letter is about twice that of Polaris.

2. Southern Cross

In the area south of 23 30' north latitude, at night ... >>

How to simply identify the southeast and northwest directions?

I look at the sun, in the east in the morning and in the west in the afternoon. After determining the east or west, I will sit in the right position according to the formula of "upper north, lower south, left west, right east". For example, the sun is in my left hand in the morning, and your left hand is standing against the sun (imagine). In front of you, it's north (up), followed by south (down), left hand east, right hand west ... At noon or when there is no sun, I'm not sure.

How to distinguish between southeast and northwest in real life?

The first method. If you can see the sun in the morning and evening, the simplest way to distinguish it is that the sun rises in the east and sets in the west, and the clockwise direction is southeast and northwest. This is basic common sense.

The second method. Nowadays, street signs in cities generally have four directions: east, west, north and south, as shown below. When I go to the street, I often check whether the road sign is in the wrong direction.

The third way is to bring a compass, but nowadays, apart from professionals, few people usually bring a compass with them.

The fourth method. Wear a watch with compass function. Now many general sports watches have this function, which is very convenient.

The fifth method. Measured with a magnet marked with a north-south magnetic field. This method is generally only used in experiments, and its accuracy is not high, so it is not recommended in real life.

The sixth method. Just download a compass app with your mobile phone. Now it is basically a smart phone, and the compass app is also very powerful. With the help of the gravity sensor of smart phone, it has high precision and convenient reading. Very user-friendly, highly recommended!

The seventh method. Just use a map app, such as Baidu map, put the phone horizontally, and then press the reset map button on the map to automatically reset the north-south direction of the map.

How to distinguish between southeast and northwest

If you don't know the southeast, northwest and northwest outside, the best way to know is to look at the road signs. Generally, N refers to the north, S refers to Guide, E refers to the east, and W refers to the west.

If there is wind, it depends on which direction it is blowing. I remember that in summer, the southeast wind blows and the front faces the wind. Both hands extend at a 90-degree angle, with the left hand facing east and the right hand facing south. In winter, the northwest wind blows, which is the wind from Siberia. The method is the same as above, the left hand faces west and the right hand faces north;

If there is a residential building nearby, it will be easier. The doors are all facing north and the balconies are all facing south, which can explain why sometimes the houses on the roadside are diagonally parallel instead of parallel to the road. That's because the road is not necessarily east-west or north-south, but the door of the house must face north, which has been measured by professionals, so this method is the most practical (mainly recommended) whether it is day or night;

And watching the sun. The general direction is east in the morning and west in the afternoon, but it is only the general direction.

In addition, there are stars at night, the inclination and luxuriance of trees, dry shadows, the flying direction of geese and so on. , but they are not very practical. Personally, I think the most practical thing is to look at the residents' houses, which is the most accurate and convenient way. These doors all face north. You just need to remember the formula of "going up north and down south, left west and right east". No matter where you are, you can tell the direction.

How to judge the direction of southeast and northwest in life?

Use a watch to tell the direction

Method 1: The sun rises and sets in the west, and we can find the east-west direction according to it. You can find the north-south direction (according to your hemisphere) with your watch. If the weather is cloudy, judge by the brightest place in the sky (the sun). If you don't wear a watch, as long as you know the time at that time, draw a watch on the paper. The position of the hour hand is consistent with the time at that time, and the direction is judged by the above method.

Northern hemisphere:

Point the hour hand to the direction of the sun, and imagine that there is a line with an included angle of half between it and 12, which points to the south.

Southern hemisphere:

Align the point 12 with the direction of the sun, and half of the included angle between the hour hand and the point 12 points to the north.

Method 2: Divide your time by 2, and then aim the quotient at the sun. The direction indicated by 12 on the dial is north.

From 9 am to 4 pm, you can quickly identify the general direction according to the following sentence: "Hour is half of the sun,'12' refers to the north". If it is at 9 am, you should face the sun at 4: 30; If it is at 2: 40 pm (that is, 14: 40), it should be at 7: 20, facing the sun, and the direction of the word "12" is the north.

It should be pointed out that:

1. "Hour" is 24 hours a day, for example, at 1 pm, it is 13 hours.

2. When judging the direction, the timetable should be flat (face up).

3. In the area between 20 30' south latitude and 20 30' north latitude, this method should not be used around noon.

4. Pay attention to the problem of time difference. That is, "based on the standard meridian of time, add 15 to the east and subtract 1 hour to the west". This method converts standard time into local time.

How to tell the direction at noon (southeast and northwest)!

If the sun rises on the left hand side in the morning, you are facing south, with the north behind you and the west on your right hand side. If the sun rises from the right hand side, you are facing the north, your left hand is facing the west, and your back is facing the south. In the afternoon, it is used in reverse. At noon, it is11:45 ~12: 65448. Other days are fine (in the northern hemisphere). Near noon (1 1 point ~ 13), you can directly see which direction the shadow is facing. That direction is north. Facing the north, the west is on the left hand side and the east is on the right hand side.

How to distinguish 5 points in the east, west, north and south directions

Do you have a watch ~

This is what my teacher told me. He is a member training class of the International Mountaineering Club.

Generally, there should be no room, but this method is very accurate.

Point the hour hand to the sun, and the opposite direction to the center of the included angle between the pointer and the minute hand is north.

Note: If it is 9: 25, point the pointer at the sun, and you can see that the bisector between 9: 00 and 25: 00 is almost north. You can confirm it first.

How does a compass distinguish between southeast and northwest?

Place the compass horizontally, facing the direction indicated by the white needle, that is, the front is north, the back is south, the left hand is west, and the right hand is east.

There should also be n, north,

South,

W. the west,

eastern region