Why is it cold in winter Why is it cold in winter?

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.

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.

In summer, the difference between the temperature of the human body and the outside world is relatively small.

I don't feel cold.

In winter, the sun hits the Southern Hemisphere more.

The temperature difference between the human body and the outside temperature is large.

Most of the heat produced by the human body is used to protect against the cold.

If you wear too little, most of the heat is lost to the outside world.

Can't guarantee their own warmth.

So it feels cold.

The reason for the cold winter is that the amount of sunlight is reduced due to the lower solar altitude angle, and the irradiation time is shortened. 1. The key factor for the earth to cool down in winter is the inclination of the earth's axis of rotation, figuratively speaking, when the earth ushers in winter, the angle of the earth is tilted.

Geographically, it's due to the direct rays of the sun, which you'll know if you've studied geography in high school.

Because China is located in the northern hemisphere, the direct sun in the northern hemisphere in summer, and the sunshine time is longer, and the ground gets more heat radiation, so the temperature is higher and the weather is hot.

The reason for the cold winter is that the amount of sunlight is reduced due to the lower angle of sunlight and the irradiation time is shortened.

In winter, some people feel very cold, while others are comparatively less cold, which is due to physical differences. People who feel very cold tend to:

1. The ability of blood circulation and reflux is relatively weak.

2. Lack of yang energy in the body.

3. Weakness of qi, blood, spleen and stomach.

Therefore, in winter, in addition to wearing a little more clothes to protect from the cold and keep warm. It is necessary to pay attention to regulating the spleen and stomach, eat more positive food, and pay attention to strengthening the body.

This is because the angle of direct sunlight varies with the seasons. In our country in the northern hemisphere of the earth, for example, the sun shines directly on the Tropic of Cancer in summer, and the sun is closest to us at this time, so it will be very warm. After the summer solstice, the sun will slowly move towards the Tropic of Capricorn, and when we are farthest from the sun, it will be cold.

The Southern Hemisphere is the opposite.

In winter, the Earth orbits to the farthest point from the Sun, so the temperature drops.

As the temperature drops, the winter is very cold.

From autumn to winter, the heat generated by the sun's rays becomes less and less, and the temperature drops.

Winter is the middle of the year.

The period of time when the solar altitude angle is the smallest and the day is the shortest; Summer, on the other hand, is the time of year when the sun has the highest altitude angle at noon and the longest day.

If any place on the earth is in the local winter, the sun must be directly in the other hemisphere (the local is in the northern hemisphere, then the sun is directly in the southern hemisphere), so the local noon solar altitude angle is small (oblique degree is large), the same amount of solar radiation through the atmosphere is long, weakened by the atmosphere is more, and the solar radiation reaching the ground is relatively small; At the same time, due to the small solar altitude angle at noon, the area of the same amount of solar radiation is relatively large, and the energy obtained per unit area is less. In addition, the daylight hours are shorter, and the solar radiation is also less, and the temperature is of course lower.

The cold in winter is due to the decrease in the altitude angle of the sun, which reduces the amount of sunlight and shortens the irradiation time, and most of the sunlight will be reflected away, and the large reduction of sunlight will naturally cause the temperature to decrease. In addition, due to the change of seasons, the originally warm air becomes cold air, which exacerbates the decrease in temperature, so it will be cold in winter. <

The cold in winter is due to the decrease in the altitude angle of the sun, which reduces the amount of sunlight and shortens the irradiation time, and most of the sunlight will be reflected away, and the large reduction of sunlight will naturally cause the temperature to decrease. In addition, due to the change of seasons, the originally warm air becomes cold air, which exacerbates the decrease in temperature, so it will be cold in winter.