Geographic graticule or something, I don t understand, please point out!

Graticule is actually a combination of warp and weft, as shown below.

The meridian is the line connecting the north and south poles, which is a semicircle, also known as the meridian. Therefore, the 0 degree meridian is also called the prime meridian. The meridian line indicates the north-south direction on the surface.

The surface meridian of the earth has a total of 360 degrees, which is divided into east longitude and west longitude. The 0 degree meridian gradually increases to the east and can increase to 180 degrees, and the 0 degree meridian gradually increases to the west and can also increase to 180 degrees. In this way, the two are exactly 360 degrees together.

Therefore, the 0 degree meridian and the 180 degree meridian are the dividing lines between east and west longitude.

The parallel, which indicates the east-west direction, is a complete circle. The 0 degree latitude is also known as the equator. The latitude is longest at 0 degrees and gets shorter the further it goes north and south.

Where north of the 0 degree latitude is the north latitude, and south is the south latitude. The parallels become shorter and shorter as they go north and south, and they become a point at 90 degrees north and south latitudes. In the same way that 90 degrees north latitude is known as the North Pole, 90 degrees south latitude is the South Pole.

If the two sites are in the same hemisphere (the northern and southern hemispheres), the higher the latitude, the farther south (in the northern hemisphere) and the north (in the southern hemisphere); The lower the latitude, the farther north (in the Northern Hemisphere) and the South (in the Southern Hemisphere).The smaller the longitude, the farther west (in the Eastern Hemisphere) East (in the Western Hemisphere); The greater the longitude, the farther east (in the eastern hemisphere) and the more western (in the western hemisphere).

If they are in the Southern Hemisphere and the Northern Hemisphere, respectively, one point in the Northern Hemisphere is further north than the other (same as above for longitude).

Longitude refers to east and west, latitude guides north, the meridian coil is a semicircle connecting the north and south poles, and the latitude coil is a circle parallel to the equator.

If you're not serious, you must not understand, take classes seriously, and leave some good memories for yourself.

Neither latitude nor longitude can have negative values. Longitude and latitude are all geographical coordinates and are all positions on the earth's surface**. The longitude is 0° 180° east and west, and the latitude is 0° 90° north and south, and there are no negative values.

Therefore, it is impossible to have longitude and latitude values such as -31° and -121°. However, the letters that indicate the direction after the latitude and longitude can be intermodulated, such as 30°S becomes 30°N, and 65°E becomes 65°W. The result of the north-south intermodulation of latitude values is simpler, indicating that the latitude values are the same and the northern and southern hemispheres are reversed.

The results of the east-west intermodulation of longitude values are slightly more complicated, and the intermodulation may not indicate the opposite of the east-west hemisphere. Because the eastern and western hemispheres are not divided by 0° meridian and 180° meridian, it depends on the specific longitude value to determine.

The east-west meridian is a vertical line on the map. On a globe, a pair of meridians (e.g., 0° and 180°) form a meridian.

The north-south latitude is a horizontal line on the map.

The Eastern and Western Hemispheres are judged on the following terms: The range of the Eastern Hemisphere is from 20°W (20 degrees west longitude) to 160°E (160 degrees east longitude).

Judging the east-west meridian on the map: first find the zero degree meridian, left west and right east; If it's a one hundred and eighty degrees of longitude, then"Right, west, left, east"。

To the west of the zero degree meridian, the longitude value (west longitude) increases westward and decreases eastward. The same goes for the other side.

Zero meridian (prime meridian): passes through the original site of the Greenwich (Greenwich) Observatory in London, England.

The northern and southern hemispheres look at the equator. Up north and down south.

Looking at the known conditions, this needs to be analyzed on a case-by-case basis. If there are no conditions, it will default to the up-north-down south-down on the map.

W is west, west. e is east, east. s is for south, south.

n is north, north. Generally, the map will give a direction as a reference, from which to determine other directions. Hemispheres also generally give the South Pole (s) as the North Pole (n).

Anyway, it's all the rules of going up north and going down, and the point is to see the reference. For example, it is seen over the North Pole and above the South Pole. We are familiar with the northern hemisphere as a reference, and when we encounter a map of the southern hemisphere, we think the other way around.

The eastern and western hemispheres are bounded by 160°E and 20°W.

If you want to judge the east-west meridian, the stupidest way is to find the prime meridian and the north pole, and then look down from the sky above the north pole, the prime meridian turns clockwise 180°, both are west longitude. The counterclockwise 180° is east longitude.

W is West, E is East, S is South, and N is North. The warp is vertical, a warp is only a semicircle, the weft is horizontal, and the daily warp is a circle. The northern and southern hemispheres are bounded by 20° west longitude and 160° Tokyo.

East of 20°W longitude to 160° west of Tokyo is the Eastern Hemisphere, and vice versa is the Western Hemisphere. North of the equator is the Northern Hemisphere, and south of the equator is the Southern Hemisphere. Remember that the approximate latitude of Beijing is (40°N, 116°E), that is, Beijing is the northern hemisphere and the eastern hemisphere.

There is a Greenwich Royal Observatory in London, England, and the meridian that passes through this observatory is called the prime meridian, which is the zero degree meridian. To the east is the east longitude, and to the west is the west longitude.

East of 20 degrees west longitude, west of 160 degrees east longitude is the eastern hemisphere, and the other half is the western hemisphere.

e is east, which is used to represent east longitude; W is west, which is used to represent west longitude.

North of the equator is the Northern Hemisphere, and n is North, which is used to represent northern latitude;

South of the equator is the Southern Hemisphere, and S is South, which is used to represent the southern latitudes.

The dividing line between the eastern and western hemispheres: 20 west and 160 east longitude, you know that China is an eastern country, in the eastern hemisphere, then China is between 20-0 west and 60 east longitude. The United States is a Western country, and in the Western Hemisphere (economically it is not divided into Eastern and Western countries), then the United States is between 20-180 W and 160 E longitude.

The dividing line between the northern and southern hemispheres is the equator, which is the 0 degree parallel.

The east-west latitude and longitude is from the prime meridian (0° meridian), and his right side is the east longitude and the left is the west path.

w(west) e(east)s(south)n(north).

The method of distinguishing between the eastern and western hemispheres: "big is west, small is east", that is, less than 20 degrees west longitude and 160 degrees east longitude in the eastern hemisphere; Greater than 20 degrees west longitude and 160 degrees east longitude in the Western Hemisphere.

The distinction between the northern and southern hemispheres: the one with n is the northern hemisphere, and the one with s is the southern hemisphere.

The dividing line between the eastern and western hemispheres is "20 west longitude, 160 east longitude", in fact, remember these southeast and northwest, it is a very simple way, you draw a cross, up and down the north, down the south, left west, right east, and then correspondingly, up n and down s, left e right w, draw a few more slowly know how to remember.

20W to 160E is the Eastern Hemisphere, and 160E to 20W is the Western Hemisphere. The Eastern and Western Hemispheres can be judged based on the direction of the Earth's rotation and the direction of the Sun's rotation. In many cases, the north-south direction is judged based on the calculation of time, and it is generally necessary to know that the day and night of the two solstices are different in the northern and southern hemispheres.

And then there's the geographic information. I don't know if you understand it or not, there is a better topic to talk about.

Eastern Hemisphere: East of longitude 20°W and west of longitude 160°E Western Hemisphere: West of longitude 20°W, east of longitude 160°E East north of the equator for the Northern Hemisphere, south of the equator for the Southern Hemisphere.

North nw west east e south s

East of 20°W longitude, 160° - 20° west of 160°E East HemisphereThe Western Hemisphere is the other half.

s is the meaning of southern Germany, there is no s in the northern hemisphere, only n north latitude is s in the southern hemisphere, for example, China is the northern hemisphere, Beijing is 40 ° n is 40 ° north latitude.

The eastern and western hemispheres are divided by a meridian coil consisting of 20 degrees west longitude and 160 degrees east longitude. North and South: 0 degrees of latitude.

Then take a look at your posting.

Dividing line between the eastern and western hemispheres: 20°W and 160°E

North and South : The equator, which is the 0° parallel.

Longitude: It is a semicircle that connects the north and south poles on the surface of the earth's instrument and is perpendicular to the parallel. The length of the meridian is about 20,037 km, and any two meridians are of equal length, intersecting at the north and south poles.

The zero degree longitude on a globe is called the prime meridian or Greenwich line. The zero meridian runs through the former site of the Greenwich Observatory in London.

Parallel: A circle perpendicular to the Earth's axis and orbiting the Earth. The length of the parallels is the circumference of the equator multiplied by the cosine of the latitude of the parallel, so the equator is the longest, and the farther away from the equator, the shorter the circumference, and it shrinks to 0 at the poles. The parallels indicate the east-west direction.

Double: The Tropic of Cancer is the northernmost line where the sun's rays can shine directly on Earth, at about 23 26 north latitude (generally estimated). The opposite corresponds to the Tropic of Capricorn.

The equator refers to the longest circumference in the trajectory of a point on the Earth's surface that rotates with the Earth. Its radius is and its circumference is kilometers. The equator is the dividing line between the southern hemisphere and the northern hemisphere, which divides the earth into two hemispheres, north of it is the northern hemisphere, south of which is the southern hemisphere, which is the baseline that divides latitude.

The equator has a latitude of 0, which is the longest latitude on Earth.

The warp coil is a great circle centered on the center of the earth and intersects at the poles of the earth. The meridian indicates due south and due north.

Important meridians The prime meridian is the dividing line between east and west longitude, east is east longitude, denoted by "e", and west is west longitude, denoted by "w".

180 degrees longitude: Located on the International Date Line, east is west longitude and west is east longitude.

The meridian coils of 20 W and 160 E are the dividing lines between the eastern and western hemispheres. Among them, the 20th longitude of west longitude: east is the eastern hemisphere, west is the western hemisphere; Longitude 160 degrees east: east of the Western Hemisphere and west of the Eastern Hemisphere.

The shortest course between two points on the Earth: The shortest distance between two points on the sphere is the inferior arc of the great circle where the two points are located.

The two places are on the same meridian coil, and the shortest route is either the North Pole or the South Pole – the shortest route is due north or south. Both places are on the equator, and the shortest route is on the equator – the shortest route is due east or west. The two are located on the same latitude, the longitude difference is not equal to 180, and the shortest route tends to the pole - in the northern hemisphere, the shortest route is first north and then south; The southern hemisphere is first southerly and then northerly.

1. Longitude bai

The longitude is divided into 360 degrees, and every 15 degrees is a time zone, of which 0 degrees is called the prime meridian, which is the first place to enter a new day, and then every 1 time zone to the west is a difference of 1 hour. For example, if it is 5 a.m., then one time zone to the west is 4 a.m., one time zone is 3 a.m., and so on, and the opposite is true to the prime meridian to the east, which means that the two sides of the prime meridian are exactly 23 hours apart.

From the equator to the poles, the latitudes are getting higher and higher. The equator is the dividing line that divides the northern and southern hemispheres.

Longitude and latitude 1 degree = 60 minutes = 3600 seconds, this sexagesim was customized by the ancient Babylonians, and we still use it today, as long as it is the same with regard to angles and circles.

2. Latitude. The latitude of the equator is 0°, which divides the planet equally into the southern and northern hemispheres.

Latitude refers to the line between a point and the center of the Earth's sphere and the angle of the Earth's equatorial plane, and its value is between 0 and 90 degrees. The latitude of a point located north of the equator is called north latitude and is denoted as n, and the latitude of a point located south of the equator is called southern latitude and denoted as s.

Areas with latitude values between 0 and 30 degrees are called low latitudes, areas with latitude values between 30 and 60 degrees are called mid-latitudes, and areas with latitude values between 60 and 90 degrees are called high latitudes.

The equator, Tropic of Capricorn, Tropic of Capricorn, Antarctic Circle, and Arctic Circle are special parallels.

First of all, don't look at geography as too difficult, learn it with a calm mind, don't be afraid, geography is a senior sister to teach you.

Geographical latitude and longitude are divided into longitude and latitude, with latitude and latitude horizontally and longitude vertically. Let's look at the latitude first, the latitude is divided into the northern and southern hemispheres, the middle 0 degrees is also known as the equator, the number of degrees to the north increases in turn, the northernmost point is the North Pole is also called 90 degrees north latitude, the southern hemisphere is the same, the latitude of the northern and southern hemispheres add up to a total of 180 degrees, it is easier to remember.

Let's look at the longitude, this one is just a little complicated, don't be afraid of it. Longitude is divided into the east and west hemispheres, a total of 0 degrees east longitude - 180 degrees east longitude and 0 degrees west longitude - 180 degrees west longitude, but it should be remembered that one thing is different, east longitude and west longitude are not completely divided into east and west hemispheres, the range of the eastern hemisphere is 20 degrees west longitude - 160 degrees east longitude, and the range of the western hemisphere is 160 degrees east longitude - 20 degrees west longitude. If you want to learn geography well, you must read more atlases!

Look at the atlas! Look at the atlas! If not, you can ask me again!

It can be seen from the figure that place A is located in the northern hemisphere, the sun in the northern hemisphere rotates counterclockwise from west to east, point f is 20 degrees west longitude on the same longitude, point A is located at the same latitude as point F, and on the east side of point f, according to the angle of 30 degrees in the figure, 20 degrees west longitude can be added to the east by 30 degrees, and the longitude of point A is 10 degrees east longitude.