How can you tell the difference between the northern and southern hemispheres? How to judge the nort

It can be judged in the following way:

1. According to the rotation of the earth.

Direction. In a top-down view of the Earth centered on the poles, the Northern Hemisphere rotates counterclockwise, and vice versa.

2. According to the geographical significance of the movement of the earth. The geostrophic deflection of the northern and southern hemispheres, as well as the height of the sun at noon, the length of day and night, and seasonal variations are opposite.

3. Judgment of time and season. Northern Hemisphere Spring, Summer, Autumn and Winter.

The month and its day, the 24 solar terms.

are different from the Southern Hemisphere.

Fourth, according to the change of latitude. The values of latitudes in the northern hemisphere increase from north to south, and the opposite is true in the southern hemisphere.

5. According to ocean currents.

Flow. The oceanic circulation at the middle and low latitudes of the Northern Hemisphere flows counterclockwise, with cold currents flowing southward and warm currents flowing northward.

Mid-high latitudes. Opposite to mid- and low-latitude flows; The situation in the southern hemisphere is the opposite in the northern hemisphere. The Northern Hemisphere Indian Ocean Current flows counterclockwise in winter and vice versa in summer.

6. According to the direction of the air flow in the cyclone (or anticyclone). Northern Hemisphere cyclones or typhoons flow counterclockwise, anticyclones do the opposite; The situation in the southern hemisphere is the opposite in the northern hemisphere.

The Eastern Hemisphere is the hemisphere east of 20°W longitude and 160°E on Earth, and the rest is the Western Hemisphere.

The northern and southern hemispheres are bounded by the equator, with the southern hemisphere to the south and the northern hemisphere to the north. For example, China is in the northern hemisphere.

The northern and southern hemispheres are judged as follows:1. North of the equator is the Northern Hemisphere, and south of the Southern Hemisphere.

2. The latitude decreases from south to north to the northern hemisphere, and vice versa to the southern hemisphere.

3. From the pole, the southern hemisphere moves clockwise, and the northern hemisphere moves counterclockwise.

The northern and southern hemispheres are divided according to the equator, south of the equator is called the southern hemisphere, and north of the equator is called the northern hemisphere. The northern hemisphere is occupied by land and by sea. Winter in the Northern Hemisphere is usually from December to February, and summer is usually from June to August, as opposed to the four seasons in the Southern Hemisphere.

The two most widespread climates in the temperate region of the Northern Hemisphere are temperate continental and subarctic coniferous forests.

All of them are located in the northern hemisphere, North America and Europe. Brazil and Australia are the two largest countries in the southern hemisphere. Oceania, South America.

Most of them are in the Southern Hemisphere. Indonesia in Asia.

More than 70% of its land is located in the southern hemisphere. Timor-Leste.

It is the only Asian country in Asia where its entire territory is located in the southern hemisphere.

Eastern and Western Hemispheres: Bounded by a meridian coil of 20 degrees west longitude and 160 degrees east longitude – east of 20 degrees west longitude and west of 160 degrees east longitude is the eastern hemisphere.

West of 20 degrees west longitude and east of 160 degrees east longitude is the Western Hemisphere.

Northern and Southern Hemispheres. It is bounded by the equator (0 degrees of parallel) – north of the equator is the Northern Hemisphere, and south of the Southern Hemisphere.

Latitude and longitude. It is the combination of longitude and latitude to form a coordinate system, called the geographic coordinate system, which is a kind of use of three-dimensional space.

The spherical coordinate system defines space on Earth and can indicate any location on Earth.

The parallel, like the meridian, is an auxiliary line hypothesized by human beings for the convenience of measurement, and is defined as the rotation of a point on the earth's surface with the earth.

The trajectory formed. Any one of the wefts is round and parallel to each other. The length of the parallels is the circumference of the equator multiplied by the cosine of the latitude of the parallels.

Therefore, the equator is the longest, and the farther away from the equator is the latitude, the shorter the circumference, and it shrinks to 0 at the poles. From the equator to the north and south, each 90°, is called the north and south latitudes, which are denoted by "n" and "s", respectively.

Important wefts:

Arctic Circle. 66°33' 38" n）

Tropic of Cancer. 23°26' 22" n）

Equator (0°N).

Tropic of Capricorn (23° 26' 22" s）

Antarctic Circle (66°33' 38" s）

The length is different (the farther away from the equator, the shorter the parallel).

Methods of judging the northern and southern hemispheres:

One. Judging by the direction of the Earth's rotation.

Basis: The Earth rotates from west to east, counterclockwise from the North Pole and clockwise from the South Pole.

Two. Judging by changes in latitude.

Basis: The arrangement of latitudes, from south to north, increases to north latitude; From south to north, the value decreases to south latitude.

Three. Judging by the change in longitude.

Basis: From the perspective of longitude arrangement, along the direction of the earth's rotation, the value of east longitude increases from west to east; The value of west longitude decreases from west to east. When solving problems, it is often necessary to first determine the east-west meridian, then infer the direction of the earth's rotation through the east-west meridian, and finally determine the northern and southern hemispheres.

Four. Judging by the length of day and night.

Basis: Spring to autumn equinox in the Northern Hemisphere, long days and short nights, polar days in the Arctic Circle, vice versa in the Southern Hemisphere;From autumn to spring in the Northern Hemisphere, the days are short and the nights are long, with polar nights occurring in the Arctic Circle and vice versa in the Southern Hemisphere.

Five. Judging by the altitude angle of the sun at noon.

Basis: On the summer solstice, the noon solar elevation angle in the southern hemisphere reaches the minimum value of the year, and the noon solar elevation angle reaches the maximum value of the year in the Tropic of Cancer and all places north of it. On the winter solstice, the noon solar elevation angle in the northern hemisphere reaches the lowest value of the year, and the noon solar elevation angle reaches the maximum value of the year in the Tropic of Capricorn and all places south of it.

Six. Judging by the bias of horizontally moving objects.

Basis: The deflection law of horizontally moving objects on the earth's surface: north, right, south, left, and the equator is not biased.

Seven. It is judged by the temperature (air temperature, water temperature).

Basis: The horizontal distribution of temperature decreases from low latitude to high latitude, so the horizontal distribution of temperature in the northern hemisphere decreases from south to north, and the horizontal distribution of temperature in the southern hemisphere increases from south to north. In addition, the northern and southern hemispheres can be judged based on the annual variation of temperature.

Eight. Judging by the distribution of ocean circulation.

Basis: The oceanic circulation centered on the subtropical sea area (anticyclonic oceanic circulation) flows clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere. The oceanic circulation centered on the subpolar region (cyclonic oceanic circulation) exists only in the northern hemisphere region, and the monsoon current exists only in the northern Indian Ocean.

Nine. It is judged by the salinity of the surface layer of seawater.

Basis: The distribution of ocean surface salinity decreases from the subtropical sea areas of the northern and southern hemispheres to the high and low latitudes on both sides.

In other words, the ocean surface salinity increases from south to north at low latitudes in the northern hemisphere, and decreases from south to north at middle and high latitudesThe salinity of the ocean surface decreases from south to north at low latitudes in the Southern HemisphereThe ocean surface salinity increases from south to north in the middle and high latitudes.

Ten. Judging by the special geomorphos.

Basis: Many natural and human elephants are only distributed in the northern or southern hemispheres, which can be an important basis for judging the northern and southern hemispheres.

Here are a few common methods:

1.According to the distribution law of global temperature: if the temperature decreases from south to north, it is the northern hemisphere; If the temperature decreases from north to south, it is the southern hemisphere.

2.Judging by the direction of the Earth's rotation: in the top view, if the Earth's rotation direction is counterclockwise, it is the Northern Hemisphere; If the direction of rotation of the Earth is clockwise, it is the Southern Hemisphere.

3.According to the law of latitude change, the number of latitudes increases to the north, which is the northern hemisphere; The number of degrees of latitude increases to the south and is the Southern Hemisphere.

4.Judging according to the deflection of horizontally moving objects on the surface: due to the deflection of objects moving horizontally on the surface, if they deviate to the right, it is the northern hemisphere; If it deviates to the left, it is the Southern Hemisphere.

5.According to the direction of the current in the middle and low latitudes, if the current flows clockwise, it is the Northern Hemisphere; If the ocean current flows counterclockwise, it is the Southern Hemisphere.

6.According to the direction of movement of the horizontal airflow of the cyclone and the anticyclonic: if the horizontal airflow of the cyclone is counterclockwise convergence, it is the Northern Hemisphere; If the horizontal flow of the cyclone converges clockwise, it is the Southern Hemisphere; If the horizontal airflow of an anticyclone converges clockwise, it is the Northern Hemisphere; If the horizontal flow of an anticyclone converges counterclockwise, it is the Southern Hemisphere.

7.Judging by the equator: north of the equator is the northern hemisphere, and south is the southern hemisphere.

8.According to climate statistics: if the average temperature of the coldest month is in January or February, it is the northern hemisphere; If the average temperature of the coldest month is in July or August, it is the Southern Hemisphere.

9.Judging from the shadow of the noon object: the shadow of the noon object always faces north, and the area north of the Tropic of Cancer is the Northern Hemisphere; The shadow of the noonday object always faces south, and the area south of the Tropic of Cancer is the Southern Hemisphere.

10.Judging by Polaris: as long as the location of the Polaris can be observed, it must be in the Northern Hemisphere; The location where the North Star cannot be observed must be in the Southern Hemisphere.

1.First of all, look at which direction the sun rises, and you will know which one is the east, so the other three directions can be launched.

2.At noon, look at the shadow spike gametes that refer to vertical objects, and the south is the southern hemisphere, and vice versa, the northern hemisphere, if there is no shadow, it is at the equator.

According to the isotherms, the northern and southern hemispheres are mainly judged in the following situations

First, it is directly judged according to the distribution of isotherms, and the isotherm values are high in the south and low in the north for the northern hemisphere; On the contrary, the north is high and the south is low, which is the southern hemisphere;

The second is indirect judgment, for example, to give the contour line and isotherm, it is necessary to judge the slope direction according to the contour line, and then combine the isotherm to judge, the high temperature on the southern slope of the mountain is the northern hemisphere, and the high temperature on the northern slope of the mountain is the southern hemisphere.

Key features: The temperature data measured at the same time in the Imperial Hall is filled in on a special map, which is called the temperature distribution map. On the temperature distribution map, the points with the same temperature value are connected into a smooth curve called an isotherm, and the map with isotherms is called an isotherm map.

Observe the isotherm diagram to first look at the value and the interval amplitude, and then look at the density of the isotherm to analyze whether the temperature difference is small or large.

Then, Mo's can analyze the reasons affecting the distribution of isotherms in combination with topographic maps, such as the separation of rows from the latitude is mainly affected by latitude. If the isotherm is parallel to the coast, it is significantly affected by the ocean. If the isotherm is parallel to the direction of the mountain range, the influence of the topography needs to be considered, so the extension direction of the isotherm can provide information for the study of the temperature distribution and causes in a certain area, and the isotherm map is the basis for studying the spatial distribution of surface thermal conditions.