twilight
Definitions
The soft, glowing light from the sky when the sun is below the horizon, caused by the refraction and scattering of sunlight in the atmosphere.
The period of time between sunset and complete darkness, or between dawn and sunrise.
A state or period of decline, or the final stage of something.
Examples
The sky turned a beautiful shade of purple during the twilight hours.
We enjoyed a quiet walk along the beach as twilight began to settle over the ocean.