What is the relationship between shadow length and the sun's angle in the sky?

The length of a shadow is inversely related to the sun's angle in the sky. When the sun is low on the horizon, such as during sunrise or sunset, shadows are long due to the shallow angle of sunlight. Conversely, when the sun is high in the sky, typically at noon, shadows are shorter because the sunlight strikes the ground more directly. Thus, as the sun's angle increases, shadow length decreases.