Why is it cold in winter and hot in summer?

Why is it cold in winter and hot in summer? It is because in winter, the height angle of the sun is smaller, the sunlight is obliquely shining on the earth, the energy density of the sun reaching the earth is smaller, and the earth gets less energy from the sun, so the winter is cold; And in summer, the height angle of the sun is large, the sunlight is almost direct to the earth, the energy density of the sun reaching the earth is very large, and the earth gets more energy from the sun, so the summer is hot.

Because the Earth's orbit around the Sun is an ellipse, in winter, our Earth is closer to the Sun; In the summer, our earth is far from the sun.

In summer, the sun's rays shine directly on the ground in the northern hemisphere, and the earth receives more heat, so it is hotter; In winter, the sun shines obliquely on the surface of the earth in the northern hemisphere, and it receives less heat, so it is colder.

The year is divided into four seasons: spring, summer, autumn and winter, and the cause of the four seasons, the distance of the earth from the sun, has little to do with the hot and cold climate. The four seasons are formed mainly because the equator and the ecliptic (the path through which the sun travels as seen on Earth) are obliquely intersected. When the Earth moves, the direction of its axis in space does not change.

In winter, the sun's rays are obliquely on the ground, and the heating per unit area on the ground is less, and the days are short, and the daily sunlight is short, that is, the heating time is short, and then because of the atmosphere around the earth, it absorbs a part of the light and heat, and when the light is irradiated, the thicker the atmosphere, the more it absorbs, so it causes cold in winter. In summer, on the other hand, the sun hits the ground directly, the days are long, and the light passes through the atmosphere and is thin, so the climate is hot. The spring and autumn rainy seasons are between winter and summer, so the climate is mild.

On the question of direct sunlight.

Summer is direct and winter is not.

In summer, the sun is big, so it's hot; In winter, the sun is small, so it is cold.

The temperature of the earth's surface is given by the sun, and the earth revolves around the sun all the time, and the trajectory of this revolution is an ellipse, so there is a problem of distance from the sun: in winter, our earth is farther away from the sun, and the solar heat energy received is smaller, so it is colder; In summer, our earth is closer to the sun and receives more solar heat energy, so it is hotter.

To put it simply, the sun is far away from the earth [winter] and 、、、vice versa

Because the angle of inclination of the earth's axis of rotation causes different angles of sunlight, the heat received by the earth's surface is also different, so there is a difference between hot and cold in the four seasons. When the sun is directly shining, the heat obtained by the earth's surface is high, and the temperature is high, which is summer, and conversely, when the sun is oblique, the heat obtained by the earth's surface is low, which is winter.

There is an angle of inclination on the Earth's axis, which causes the direct point of the sun to move back and forth between the Tropic of Cancer, which leads to different angles of sunlight and different amounts of energy obtained.

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

Every year on the spring and autumn equinoxes, the sun shines on just half of the earth's surface evenly, and day and night are equally divided around the world.