Is the sun shadow the longest or the shortest from winter to the sun?

For the northern hemisphere, the winter solstice has the longest sun shadow, but the situation in the southern hemisphere is just the opposite.

On the solstice of winter, the sun shines directly on the tropic of Capricorn. For the northern hemisphere, it is the shortest day of the year, and the sun's altitude angle at noon is the smallest, which is directly related to the length of the shadow. The smaller the altitude angle of the sun, the longer the shadow.

North of the Arctic Circle, the sun is below the horizon all day, which is the widest day of the year in the northern hemisphere. For all parts of the northern hemisphere, the winter solstice is also the day with the lowest sun height at noon all year round.

Extended data:

The winter solstice is a solar term that reflects the regression movement of the direct point of the sun. There is a saying that "the solstice in winter is a sunny day". In fact, strictly speaking, "Yang" has the concepts of Yin and Yang and Yang of the sun. On the solstice after winter, the height at which the sun rises is not the yang spirit in the concept of "yin and yang". The yang in "winter brings forth the sun" belongs to the sun, not yin and yang. They are different concepts.

The solar terms from the winter solstice reflect the deviation law of the direct sunlight point on the earth's surface. The arrival of the winter solstice solar terms indicates that the height of the sun is the smallest and the day is the shortest in all parts of the northern hemisphere, which is not the day with the highest concept of yin and yang. "Yin-Yang and Five Elements" belong to the category of "trunk and branch", and the growth and decline of "Yin-Yang" is based on "trunk and branch", not on the deviation of direct sunlight.

According to the law of solar terms, beginning of spring is the starting point of the rising of "Yin and Yang" qi in Yang Qi. Since the beginning of spring, Yang Qi has changed and Yang Qi has risen. The solstice in winter is the starting point for the return of the sun. Since the winter solstice, the sun has returned to the north, and the days in the northern hemisphere have increased day by day. The winter solstice is a solar term that reflects the movement law of the direct point of the sun. Since the winter solstice, the height of the sun has risen, the sunshine has become stronger and the days have become longer and longer.