Which type of night illumination is defined as natural light from the moon and stars?

• A. Ambient
• B. Cultural
• C. Artificial
• D. Lunar

Answer: (A)

Ambient illumination is the natural light present in the environment, not produced by human sources. At night this includes light from the Moon and the stars, plus any other natural phenomena that contribute to visibility. This broad, natural category is what you use when referring to night lighting that isn’t created by people. Lunar would describe moonlight specifically, but ambient covers moonlight and starlight together, making it the more accurate term for natural night illumination. Cultural and artificial lighting describe human-made sources, which is why they don’t fit the definition in this context.