Geographical knowledge: how to understand that the longer the day, the greater the rotation angle of the tree shadow? I can't understand the analysis. . .

It can be understood that the summer solstice is the longest day in the northern hemisphere. The longer the day, the more northerly the sunrise, and the greater the angle with the due east. The shadow of the tree is located in the southwest, and the greater the angle with the due west. The longer the day is, the more southerly the setting sun is, and the greater the angle with the due west direction. The shadow of the tree is located in the northeast, and the greater the angle with the due east. For example, on the vernal equinox, the sunrise is due east, the sunset is due west, and the rotation direction of the shadow on the ground is 180. After the vernal equinox, this angle is greater than 180, and the closer it is to the summer solstice, the greater the angle (the shadow rotation angle on the Arctic Circle from summer to morning is 360).