It is very cold in winter, because the sun is farthest from the earth in winter.

Wrong. It is cold in winter because the sun shines directly in the southern hemisphere in winter, while the northern hemisphere is diagonally opposite to the sun. The energy of sunlight per unit area is small, and the warming effect of sunlight on the earth is small. On the contrary, the earth is closer to the sun in winter, and the closest date for the earth to the sun is 1 the beginning of the month (perihelion).

When we say it's cold in winter, we mean it's cold in the northern hemisphere. At this time, the southern hemisphere is in summer and the weather is hot. As far as the whole earth is concerned, what we say is cold in winter is incorrect.

The reason for the cold weather is that the direct point of the sun in winter is in the southern hemisphere, which is close to the southern hemisphere and far from the northern hemisphere. The distance from the sun is not the main reason for the high and low temperature. The distance between the sun and the earth is 65438+500 million kilometers, while the radius of the earth is only over 6000 kilometers. Compared with the distance between the sun and the earth, the distance between the southern hemisphere and the northern hemisphere in winter is not much different from the sun. This statement is untenable. The main reason for the temperature difference between the northern and southern hemispheres is the difference of the solar altitude angle between the northern and southern hemispheres.