From this picture, how to judge which is the winter solstice and which is the summer solstice?

I didn't do very well in the geography exam, so I must try my best to understand it. I just turned over the encyclopedia and the review paper of the exam, and both of them tragically found that the pictures were different. Anyway, I'll try my best. You understand best.

First of all, China is located in the Eastern Hemisphere and the Northern Hemisphere, and N is North, so China is in the upper right corner. The sun shone in the past. I studied mathematics. There are blind spots, so the sun cannot shine. If we look at it this way, 3 is straight, on the tropic of cancer, so it is summer. Spring, summer, autumn and winter must be arranged in order, so the opposite 1 must be winter. This can also be judged. Look at the red line I drew. It's a straight line. Then, because the rotation of the earth leads to 24 hours, the revolution leads to four seasons, and the direction of revolution is from west to east, so according to the direction of this picture, it turns from west to east, so 2 is spring and 4 is autumn. It's also a simple way to divide on my map, but remember that spring and summer are the tropic of cancer, and summer and autumn are the tropic of cancer, and which direct area is spring and summer.