Why do the seasons change?

The autobiography of the earth, which leads to the cycle of day and night. When it is daytime in our country, it is night in the United States, and that is because the rotation of the earth creates different time zones. The Earth is divided into 24 time zones, with an average of 15° one time zone.

China and the United States are in different time zones, so when it is daytime in China, it is night in the United States, which is a phenomenon caused by the rotation of the earth.

The rotation of the earth leads to the alternation of the seasons. When it is summer in our country, it is also summer in the United States; When it is winter in our country, it is also winter in the United States, and in this respect, there is actually no difference between our country and the United States. This is because both our country and the United States are in the northern hemisphere.

The opposite of China's climate is generally the countries of the southern hemisphere, such as Argentina.

So why is there a cycle of spring, summer, autumn and winter, and the alternation of day and night?

The reason for the alternation of the seasons is that the Earth's axis of rotation is at an angle to its orbit. Therefore, the seasons in the Northern and Southern Hemispheres are opposite.

But the United States and China in the Northern Hemisphere have the same four seasons. Generally, June, July and August are the warmest times in the Arctic every year, and the temperature may be a few degrees below zero or even a few degrees above zero. Every year in December, January and February are the coldest times in the Arctic, with temperatures of minus tens of degrees.

The Antarctic and the North Pole are located at high latitudes and lack direct sunlight, so it is winter all year round, in fact, it cannot be completely said that there are no changes in the four seasons, but only that the changes in the four seasons are not obvious, because, regardless of summer and winter, they are both cold anyway, but the degree of cold is different. But there will be changes in polar day and polar night.

The Earth's orbit around the Sun is elliptical and has an angle to the plane of its rotation. When the earth is in different positions of the orbit at different times of the year, different places on the earth receive different solar rays and receive different heat from the sun, so there are seasonal changes and differences in cold and heat.

Climatically, the four seasons are distinguished by temperature. In the Northern Hemisphere, generally speaking, March and May are spring, June and August are summer, September and November are autumn, and December and February are winter.

In the Southern Hemisphere, the seasons are at exactly the opposite time of day in the Northern Hemisphere. When it's summer in the Southern Hemisphere, it's winter in the Northern Hemisphere; It is winter in the Southern Hemisphere and summer in the Northern Hemisphere. There are no clear boundaries between the seasons, and the transition of the seasons is gradual.

The four seasons on Earth manifest first and foremost as an astronomical phenomenon, not only periodic changes in temperature, but also in the length of day and night and the height of the sun. Of course, the length of day and night and the change in the height of the sun at noon determine the change in temperature.

The gradual change of the seasons is not uniform across the globe, with summer in the northern hemisphere and winter in the southern hemisphere; The Northern Hemisphere changes from warm to cold, and the Southern Hemisphere changes from cold to hot. The length of day and night and the height of the sun change periodically in different seasons.

The four seasons are formed by the revolution of the earth around the sun, and in our country, the closest time the earth's revolution is to the sun, summer is the opposite, and vice versa, and spring and autumn are not far away. Because the Earth is elliptical and the equator is closest to the Sun, it is the hottest all year round, and the two North and South Poles are the farthest from the Sun, and it is winter all year round.

"The earth has four seasons because there is an angle between the earth's orbit around the sun and the axis of the earth's rotation, so when the earth is in different positions on the earth's orbit, the angle of sunlight on the earth will be different, and this difference will reach the maximum when the sun is about the day, and basically in the middle when the sun is about the day. Different locations on Earth absorb different amounts of heat in the same place, thus.

1.The four seasons refer to the four seasons that alternate in a year, namely spring, summer, autumn, and winter.

2.In astronomy, the division of seasons is determined by the position of the Earth in its orbit around the Sun.

3.When the earth is in different positions of the orbit at different times of the year, different places on the earth receive different solar illumination, receive different heat from the sun, and produce seasonal changes and differences in cold and heat.

4.The seasons on Earth are not only periodic changes in temperature, but also in the length of day and night and the height of the sun. It influences or determines the rhythm of movement of many things in the Earth's environment, especially biological adaptation.

This is because of the rotation of the sun.

The main reason is that the earth is tilted and rotated. The Earth's orbit is elliptical though. But this ellipse is very close to a perfect circle.

The Earth's distance from the Sun does not change much over the course of the year. That's not why the seasons change. The point is that the Earth is tilted and rotated.

The angle of inclination is 23 degrees 26 minutes. The presence of this angle creates a shift in the point of direct sunlight throughout the year. This also causes a change in the altitude angle of the sun on the ground.

And the change in the angle of the sun's altitude causes a change in the heat received by the ground. This is the reason for the formation of the four seasons.

Because of the yellow and red angles, the direct point of the sun is constantly moving, and there are changes throughout the year.

There is an angle (23°26) between the Earth's axis of rotation and the Earth's orbit around the Sun (the ecliptic plane), so when the Earth revolves around the Sun, the position of the Sun directly on the Earth changes, from 23°26 S (Tropic of Capricorn) to 23°26 N (Tropic of Cancer).

When the sun is directly shining, the heat obtained by the earth's surface is high, and the temperature is high, which is summer; Conversely, when the sun is obliquely shining, the heat gained from the earth's surface is low, which is winter.

When the sun shines directly into the Northern Hemisphere, it is summer in the Northern Hemisphere and winter in the Southern Hemisphere; Conversely, when the sun shines directly into the Southern Hemisphere, it is summer in the Southern Hemisphere and winter in the Northern Hemisphere.

When the sun reaches the Tropic of Capricorn, the winter solstice (around December 22) and the summer solstice (around June 22) are respectively. When the sun reaches the equator, the spring equinox (around March 21) and the autumn equinox (around September 21) are respectively.

The Earth and the Moon are a system of planets that revolve around the Sun.

The sun is the center of the solar system, the earth is a planet in the solar system, and the moon is a natural satellite of the earth.

In the Earth-Moon planetary system, the Moon revolves around the Earth, and the Earth rotates constantly, creating a difference between day and night.

The phases of the moon change. Since the moon itself does not emit light or is transparent, the half of the sphere facing the sun is a bright area, and the other half of the sphere is a dark area (blocked by itself) under the sun's rays. As the position of the Moon changes relative to the Earth and the Sun, the illuminated side of the Moon is sometimes facing the Earth and sometimes facing away from the Earth; Sometimes the shiny part facing the Earth is larger, sometimes it is smaller, so that different phases of the moon appear.

It can be simply summarized into two things:

1. The moon does not emit light and is opaque.

2. It is related to the relative position of the moon, earth and sun.

Categories: Science & Engineering.

Analysis: The change of seasons is the result of the combined effect of the Earth's rotational inclination and revolution around the Sun.

The orbit of the Earth's revolution is an ellipse that is close to a perfect circle, and the Sun is located in a focal point. The rotation period of the earth is one year, and the angle between the earth's orbit (ecliptic plane) and the earth's rotation plane (equatorial plane) is the yellow-red angle, and the angle is 23 degrees 26 minutes, which causes the direct point of the sun to move between the Tropic of Cancer and the Tropic of Capricorn in a one-year cycle, forming the four seasons in the temperate zone.

The change of the four seasons is actually the change of the direct point of the sun, on March 21 of each year, the sun directly hits the equator, the global equinox, which is the day of the spring equinox of our (the northern hemisphere), and on June 22, the direct point of the sun moves north to the Tropic of Capricorn, becoming the longest day of the day in the northern hemisphere, which is the summer solstice, and then the direct point of the sun turns to the south, and on September 23, it hits the equator directly, which is the day of the autumnal equinox, and on December 22, it moves to the Tropic of Capricorn, and it is our winter solstice. The situation in the southern hemisphere is reversed.