The easiest way to determine the direction of geographical navigation? 5

There are many easy ways to do this, depending on what kind of environment you are in, such as waking up in the morning and facing the sun.

The front is east and the back is west.

The left is north and the right is south.

Look at the map, it is up, north, down, south, left, west, right, east.

And so on.

1. The sun rises in the east and sets in the west.

Facing east, south on the right-hand side! On the left-hand side is North.

2. Polaris The Polaris is the best compass, and the direction in which the Polaris is located is due north.

3. The Big Dipper.

That is, the constellation Ursa Major, like a giant spoon, is easy to find in the clear night sky, and from the direction of the extension line of the two stars on the side of the spoon, about 5 times apart, there is a brighter star that is the North Star, that is, due north.

4. Immediate results.

In a clear day, use a straight skewer perpendicular to the ground and stick it into the ground to form a shadow under the sun's rays. Place a stone at the apex of the shadow, and after about 15 minutes, when the apex of the shadow moves to another place, put another stone, and then connect the two stones in a straight line, the side to the sun is south, and the opposite direction is north, the higher the straight skewer, the thinner, and the more perpendicular to the ground, the longer the shadow moves, the more accurate the direction measured.

5. Trees and moss.

The dense canopy side should be south, and the sparse side should be north. The truth of moss is intertwined. In addition, the direction can be determined by looking at the growth rings of the trees. The sparse side of the growth rings faces south, and the densely grained side faces north.

6. Melting of snow The place where the snow melts must be facing south.

7. Use the sun and the time table to judge: divide the time you are in by 2, and then align the obtained quotient with the sun, and the direction of 12 on the dial is north. "The hour is half of the sun, and 12 refers to the north".

Teach you a method that I commonly use to identify the direction, which is to align the right side of your body with the sun, and you can judge the direction!

It depends on what kind of transportation you use. Routes vary from one vehicle to another. Like an airplane, it walks in an arc, and this arc is a great circle around the center of the earth.

The most primitive and convenient thing is to use the position of the sun to judge. In China, except for the whole province of Hainan, Taiwan, and the southern region of Yunnan in Guangdong, the direction of 12 noon in all parts of the year is south. The closer you get to 12 noon, the more the Sun tends due south.

Specifically, the sun rises in the southeast and sets in the southwest. On the two days of the spring and autumn equinox, the sun rises in the east and sets due west.

If you are in an urban area, it is even better to say that the main roads of our cities are east-west-north-south.

Affected by the shape of the Earth's sphere, the shortest distance between two points on the sphere is the inferior arc of the great circle that passes through these two points.

The Earth is spherical, unlike a plane, with the shortest line segments between two points.

Because it is affected by the direction of the wind, the currents, and the coastline of the mainland.

The Earth is an irregular sphere with slightly flattened poles, but when discussing the shortest course between two points, it is generally approximated that the Earth is a positive sphere, that is, the shortest distance (or course) between two places on the surface of the Earth should refer to the length of the inferior arc between these two points of the great circle of the sphere, and the center of this circle must pass through the center of the sphere (i.e., the center of the earth). In the middle school geography exam, there are mainly the following situations.

1.The shortest distance between two points on the twilight line is the inferior arc between the two points on the twilight line. As shown in Figure 1, the shaded part of the right is the night, and the shortest route between gh is to follow the inferior arc of the morning and dusk line

First southeast, then due east, then northeast, i.e. through GMH, not gyh.

2.The shortest distance between two points on the equator is the part of the inferior arc between two points on the equator. As shown in Figure 1 on the left, the shortest route between AB is due east or B to A is due west.

4.If the difference in longitude between two places is equal to 180°, then the great circle passing through two points must be a meridian coil. The shortest distance between these two points must pass through the poles, and the result can only be due north and then due south or first due south and then due north.

At two points in the Northern Hemisphere, the shortest route must pass through the North Pole, and the direction of navigation must be due north first, and then due south after crossing the North Pole. As shown in Figure 1, the shortest route between EFs is due north and then south, that is, the inferior arc of the meridian coil that passes through the three points of ENF, rather than following the latitude of EF.

At two points in the Southern Hemisphere, the shortest route must pass through the South Pole, and the direction of its voyage must be due south first, then due north after the North Pole.

When the two places are located in different hemispheres, it is necessary to consider whether passing through the North Pole is inferior or passing through the South Pole is inferior and then determine the direction of the shortest voyage. As shown in Figure 1, the shortest route from point E to point X in the left figure is first due north and then due south, that is, the inferior arc of the four points of ENFX passing through the meridian coil; Instead of first due south and then due north, i.e. it is not an arc of three points of ESX passing through a warp coil. Note:

In the above four cases, the equator, meridian, meridian, and morning and dusk lines are all part of the great circle or great circle, so the spherical distance can be directly intercepted.

5.If the longitude difference between the two places is not equal to 180°, then the great circle passing through the two places is not a meridian coil, but an oblique intersection with the meridian coil, and its shortest route does not pass through the pole, which is divided into two situations.

If A is located to the east of B, the shortest route from A to B can be divided into: in the same northern hemisphere, first to the northwest, then to the west, and finally to the southwest; If they are in the same hemisphere, first to the southwest, then to the west, and finally to the northwest; If you are located in different hemispheres, you need to discuss which segment is the inferior arc.

If A is located to the west of B, the shortest route from A to B can be divided into: in the same northern hemisphere, first to the northeast, then to the east, and finally to the southeast; If they are in the Southern Hemisphere, they will first go southeast, then east, and finally northeast; If you are located in different hemispheres, you need to discuss which segment is the inferior arc.

Arc ab = r

where is the spherical angle of the two points a and b, the unit is radian, and r is the radius of the earth).

Therefore, the essence of finding the spherical distance problem is to find the spherical centroid angle.

Possible scenarios between two points:

1) Calculation of spherical distances at two points of the same longitude.

2) Calculation of spherical distances at two points at the same latitude.

3) The distance between any two points on the spherical surface of the sphere that is neither latitude nor different longitude is very simple, and can be obtained according to the latitude and longitude;

In case 3, you can assume that point C is the same longitude as A, the same latitude as B, and the geocentric is O, according to the calculation method of the side length of the triangle, calculate the straight-line distance between AB, and then calculate the AOB angle, and then substitute the formula to calculate the arc AB length.

The circle where the AOB is located is what you are looking for.

Think of the earth as a spherical shell, without latitude and longitude lines, find two points on the surface and the center of the earth, that is, the center of the sphere, connect the points and the center of the sphere respectively, and get two radii, the two radii determine a plane, one radius rotates in this plane, and a trajectory is drawn on the sphere, and that trajectory is the great circle sought.

First, which is close to the South Pole and which is in the south, and vice versa, the other is the north.

Second, clockwise to the east, within 180 degrees of longitude, the east one is in the east and the west one is in the west.

The method is the same; clockwise, east in front and west in back; Near the South Pole is south; It is far north from the South Pole.

In the southern hemisphere, it is also up north and down south

About the shortest route.

If the two places cross the North Pole in relative longitude (that is, the sum of the longitudes of the two meridians is 180 degrees), they will first go north, and after passing the North Pole, they will fly south; If you cross the South Pole, you will fly south first, and after the South Pole, you will fly north.

If the two places are at the same latitude and not at the same longitude, draw a circle through the AB point, just like you cut an apple, find a random place to cut, a knife down is a circle, the arc above AB is the direction of flight, if point A is on the left of point B, fly from A to B is first northeast, then east, and finally southeast, if from B to A, it is first northwest, then west, and finally southwest.

Because the earth is round, the latitude and longitude lines are not straight, they are arcs, so they cannot fly directly along the graticule to b

1. Direction judgment in the southern hemisphere.

In the southern hemisphere it is still up north and down south.

Second, the issue of the shortest voyage.

1. From A to B, if it is on the same meridian, it should be flown along the meridian, the closest distance, the shortest voyage.

2. If A and B are on the same latitude and fly along the latitude, they will take an arc, of course, not the shortest voyage.

3. If A and B are not on the same latitude and longitude line, flying along the latitude and longitude line is not a straight distance, and of course it is not the shortest voyage.

Tell you a way, no matter what hemisphere, you imagine yourself standing on it, facing the North Pole, and then you go up north and down to south, left west, right to east. For the shortest route, you remember to fly first in the direction of the pole and then towards the end point. When studying geography, you can't memorize it to understand, but you must remember some theoretical laws.

Same up north and down south!! But you need to set the picture right! It's the graticule. You can play around next Google Maps! Check it out.

The first is how to find the shortest distance between two points on earth.

The shortest distance on the sphere is the inferior arc of a great circle that crosses two points. A great circle on the surface of the earth is a circle with the radius of the earth. The great circles that are available on Earth are: the equator, all the meridians (the two meridians with longitude and 180 combined), and the morning and dusk lines.

In your question, the longitude and sum of the two airports are exactly 180 degrees, so the flight of the plane only needs to go around this warp coil. Flying from (30N, 120E) to (35S, 60W), you can just draw a warp coil on the diagram, take the short arc between two points, that is, the inferior arc, and fly from A (30N) to the south to B (35S) as long as you fly 65 degrees of latitude. The difference in latitude on the same meridian on the earth is one degree, the distance is about 111km, so the shortest distance traveled is 111 times 65 degrees, which is about 7215km.

In the future, when you encounter such a problem, you first observe whether the two points are on the same great circle, that is, whether they are both at the equator, the same meridian coil or the morning and dusk line. If so, just fly around the existing large circle in the inferior arc. If the two points are not on these great circles, then you remember that if both points are in the Northern Hemisphere, just draw a northward convex arc after two points is their shortest flight route, and if both points are in the Southern Hemisphere, just draw a southward convex arc after two points is their shortest flight route.

There was a mistake upstairs.

There are two ways to find the shortest course distance for a spherical surface:

If the sum of degrees of longitude between the two places is equal to 180°, then the great circle passing through the two places is the meridian coil, and the shortest voyage between the two places passes through the pole.

If the sum of the degrees of longitude of the two places is not equal to 180°, then the great circle of the two places is obliquely crossed with the meridian coil, and its shortest voyage does not pass through the pole.

What the landlord said belongs to the first situation, the shortest route must pass the South Pole, fly south along 120 °E, after passing the South Pole, it is to fly north along 60 °W, and the latitude that flies in turn is: 30 ° N - 0 ° - 90 ° S - 35 ° S, across 175 latitudes, range: 175 * 111 km = 19425 km.

I will try to simplify this problem, in special cases, if 2 points are on a warp coil, go along the inferior arc of the warp coil, if on the same morning and dusk circle, go along the morning and dusk circle along the inferior arc, these are two common special cases, if not the above two, just make a circle after two points, the center of the circle is in the center of the sphere, the circle is on the spherical surface, and it also goes along the inferior arc.

The latitude that this question flew in turn is: 30°N-0°-90°S-35°S, spanning 175 latitudes, and the range: 175*111 km = 19425 km.

You can think of the Earth as a sphere, and the shortest distance is to fly from low latitudes to high latitudes, and from high latitudes to low latitudes. You can think of this path as a v or an inverted vAs for the direction, you can look at the latitude, the same latitude is due east or west, of course, pay attention to whether this arc is greater or less than 180

If it's not in the same parallel, it depends on which direction it is off. It is recommended that lz you draw a plane coordinate system, which is easy to see.

The first answer is indeed wrong, and the latter one is very correct.

Such a fine thing will be tested in the current geography is really ......

First to the southeast, then to the southwest.

So, you buy a watermelon and you draw it according to this picture, and then you find that you have an arrow in the knee.

Because to put it simply, don't think of this as a two-dimensional plane, but as a three-dimensional one, so that you can start thinking about this problem, and let you buy a watermelon to think about it, which is basically what it means.

Geography is not difficult, I think it is more interesting than history.

That's it. Adopt it, dear! The answer is right.

The earth is a sphere, point d, due north is the point, point d, point is due south, point c b is east of d, so southeast and then southwest.

The aircraft carrier has an integrated weather reconnaissance and early warning system, and the wind direction and wind force are only its basic reconnaissance data.