The changing trend of summer shadows in the northern hemisphere is

From the beginning of the day, 12 from morning to noon, the shadow gradually becomes shorter. After 12, the shadow becomes longer and longer. In summer, there are two situations. First, from summer to the day before, the shadow gradually becomes shorter, and from summer to the future, the shadow gradually becomes longer. This is the situation north of 23.26 degrees north latitude. Between the equator and 23.26 degrees north latitude, the shadow gradually becomes shorter before the summer solstice, then becomes longer, and becomes shorter and longer after the summer solstice. This is caused by the movement of the direct point of the sun