Why are the seasons in the southern hemisphere opposite to those in the northern hemisphere?

This is because there is an equatorial angle (23 26') between the equatorial plane and the orbital plane (ecliptic plane) of the earth. Because of the equatorial angle, the sun will make a regression movement between the tropic of cancer and the tropic of cancer relative to the earth, and each regression movement between the tropic of cancer is called a tropic of cancer. In a tropic of cancer year, when the sun shines directly on the tropic of cancer, it is summer in the northern hemisphere and winter in the southern hemisphere.

When the sun shines directly on the tropic of Capricorn, it is summer in the southern hemisphere and winter in the northern hemisphere. When the sun shines directly on the equator twice, it is spring in the northern hemisphere and autumn in the southern hemisphere, and vice versa. So the seasons in the northern hemisphere and the southern hemisphere are completely opposite, including not only summer and winter, but also spring and autumn.

The northern hemisphere is the area north of the equator of the earth. All the people in the northern hemisphere are North America and Europe. In this hemisphere, land accounts for 39.3% and ocean accounts for 60.7%. Winter in the northern hemisphere is usually 65438+February to February, and summer is usually June to August, which is contrary to the four seasons in the southern hemisphere. The two most widely distributed climates in temperate regions of the northern hemisphere are: temperate continental climate and sub-frigid coniferous forest climate.

Between the south pole and the equator, south of the equator is the southern hemisphere. Antarctica lies near the South Pole. Brazil and Australia are the two largest countries in the southern hemisphere. Most of Oceania and South America are in the southern hemisphere. Indonesia in Asia is located in the southern hemisphere because more than 70% of its territory is located in the southern hemisphere.

Extended data:

Most of the land on the earth (most of Asia, the whole of Europe, the northern half of Africa, the northernmost part of North America and South America) and population are in the northern hemisphere.

The northern hemisphere is home to most economically and militarily developed countries in the world, such as China, the United States, Japan, Britain, Germany, France, Denmark, Norway, Sweden, Italy, the Netherlands, Spain and Portugal. In the northern hemisphere, winter is usually 65438+February to February, and summer is usually June to August, which is contrary to the four seasons in the southern hemisphere.

According to the inclination of the earth's axis, winter in the northern hemisphere begins from the winter solstice (about 65438+February 22) and ends at the vernal equinox in March (about March 20). Summer begins from the summer solstice (about June 2 1) and ends in vernal equinox in September (about September 2 1). The northernmost part of the northern hemisphere is the Arctic Circle, and the North Pole is the northern end of the Arctic Circle. Its seasons can be roughly divided into winter and Leng Xia is cold, and the average temperature is lower than other areas.

In winter, the Arctic will encounter the situation that the sun is below the horizon for one day or more, which is called extreme night. In summer, the sun will be above the horizon for one or more days in a row, which is called an extreme day. This situation lasts at least one day in the Arctic Circle, and it can last for several months in areas close to extremes.

The area south of the Arctic Circle and north of the Tropic of Cancer is a temperate zone in the northern hemisphere. Compared with the Arctic region, its temperature changes are mild, and extreme cold and extreme heat are rare. However, this mild climate is also prone to unpredictable weather. The climate in the tropical region of the northern hemisphere (south of the Tropic of Cancer and north of the equator) is often very hot all year round. Generally speaking, it is rainy in summer and dry in winter.

In the northern hemisphere, large objects passing through or above the ground level will move clockwise under the action of Coriolis force. Large air currents or ocean currents will do the same in the northern hemisphere, and the ocean currents in the North Pacific Ocean and the North Atlantic Ocean are the best examples. In the southern hemisphere, the direction is just the opposite.

Baidu encyclopedia-northern hemisphere

Baidu encyclopedia-southern hemisphere