If the length of the shadow of a tower increases, the angle of elevation of the Sun:

Correct answer: Decreases. tan(angle) = height ÷ shadow length. A longer shadow gives a smaller tangent, so the angle decreases.

Background: The Sun is lower in the sky when the shadows are long.

• Increases: The angle increases when the shadow gets shorter.
• Same: The angle changes when the shadow changes.
• Zero: The angle does not become zero.

Did you know? Shadows are longest in the early morning and evening.

Memory trick: Longer shadow → lower Sun.