What primary phenomenon causes a location to experience night darkness?

Answer

The location faces away from the Sun, and the primary source of illumination is removed

Night occurs when a specific location on Earth rotates to face away from the Sun; without the intense solar light, the atmosphere has no major light source to scatter, making it appear invisible against space.

What primary phenomenon causes a location to experience night darkness?
Darknessweatherskyatmospherephenomenon