Explain what the winter solstice is from a geographical perspective?

Because the orbital plane of the Earth's rotation around the sun is not consistent with the equatorial plane, but maintains a certain tilt, the position of the direct sunlight hitting the Earth is different throughout the year. In the northern hemisphere, when the sun shines directly at 23.5 degrees north latitude, it is called the summer solstice in astronomy; when the sun shines directly at 23.5 degrees south latitude, it is called the winter solstice. place. Since the angle of sunlight affects the temperature, and direct sunlight has a higher temperature than oblique sunlight, when the sun shines directly on the Tropic of Capricorn, the solar radiation angle in the northern hemisphere reaches the lowest level throughout the year. If other factors are put aside, the northern hemisphere reaches the lowest temperature on the winter solstice. . After the sun shines directly on the Tropic of Capricorn, it slowly moves northward. Winter is not over until it moves to the equator (which is the vernal equinox). Therefore, the winter solstice can be said to be the climax of winter. ; Summer solstice and winter solstice mean that it has reached the middle of summer and winter. During the summer solstice, the day is the longest and the night is the shortest. On the winter solstice, the opposite is true. The day is the shortest and the night is the longest. After the winter solstice, the days become longer day by day.