Does a shadow move or change size?
If the source of the light is moving, the shadow moves. If the object moves, then again the shadow moves. If an object is moved closer to the light source, the shadow gets darker and bigger. If an object is moved further away from the light source, the shadow gets lighter and smaller. Also, if the light source is exactly above the opaque object, the shadow will be the shortest, sometimes which can’t be seen.
As you can see in my illustration below, the sun will give objects the longest shadow at the beginning and end of the day, because that is when the sun is lowest in the sky. The shortest shadow cast using sunlight would be in mid-day because that is when the sun is highest in the sky. At mid-day the sun is directly above us and the light rays are coming almost straight down so the shadows our bodies create are short and squat, because we are blocking the light from hitting directly below us. In the morning and afternoon the sun is lower in the sky and the light hits us at an angle, which produces long, thin shadows.
