Twilight

The light perceived before the rising, and after the setting, of the sun, or when the sun is less than 18? below the horizon, occasioned by the illumination of the earth's atmosphere by the direct rays of the sun and their reflection on the earth.

faint light; a dubious or uncertain medium through which anything is viewed.

Seen or done by twilight.

Imperfectly illuminated; shaded; obscure.

a condition of decline following successes; "in the twilight of the empire"

the diffused light from the sky when the sun is below the horizon but its rays are refracted by the atmosphere of the earth