According to the pictures, write down which hemisphere the sun shines directly at the vernal equinox, summer solstice, autumn equinox and winter solstice.

1, the vernal equinox points directly at the equator, the summer solstice points directly at the northern hemisphere, the autumn equinox points directly at the equator, and the winter solstice points directly at the southern hemisphere.

2. Expand:

Are spring, summer, autumn and winter divided according to the position of the direct point where the sun shines directly on the earth? The Tropic of Cancer is the northernmost and southernmost point where the sun shines directly on the earth. In other words, direct solar energy is only within the tropic of cancer. The equator just divides it into two parts, one in the northern hemisphere and the other in the southern hemisphere.

In this way, when the sun shines directly on the northern hemisphere (that is, from summer to around), the weather in the northern hemisphere is hot, that is, in summer, when the sun shines directly on the southern hemisphere (that is, from winter to around), the weather in the southern hemisphere is cold, that is, winter. It is spring or autumn when the direct sunlight is neither too close to the north nor too close to the south (that is, around the vernal equinox or autumnal equinox). ?