The shadow of an object in the northern hemisphere is the shortest day of the year ()?

I admire the answer from upstairs. Others ask that the shortest shadow is that day. The answer upstairs is that the longest is that day. The shortest is the summer solstice. When the summer solstice comes, the sun will shine 90 degrees directly on the tropic of cancer at noon, while in the long summer, the sun will shine 90 degrees directly on the equator at noon. From this day on, the sun will move north until the summer solstice. The summer solstice is the longest day and the shortest night in the northern hemisphere. After the summer solstice, due to direct sunlight, it will gradually move south, and the days in the northern hemisphere will gradually shorten and the nights will gradually lengthen. Until the winter solstice, it is the shortest day and the longest night in the northern hemisphere. After the winter solstice, the sun will gradually move northward, the days will gradually become longer and the nights will gradually become shorter. So every year. This is related to the tilt of the earth's axis. From the above, we can know that the shortest shadow day in the northern hemisphere is on the solstice in summer and the longest shadow day is on the solstice in winter. Similarly, the longest shadow in the southern hemisphere is on the summer solstice, and the shortest shadow is on the winter solstice.