Twilight Dusk

Twilight

Twilight is daylight illumination produced by diffuse sky radiation when the Sun is below the horizon as sunlight from the upper atmosphere is scattered in a way that illuminates both the Earth's lower atmosphere and also the Earth's surface. Twilight also may be any period when this illumination occurs, including dawn and dusk.

Dusk

Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just before nightfall. At predusk, during early to intermediate stages of twilight, enough light in the sky under clear conditions may occur to read outdoors without artificial illumination; however, at the end of civil twilight, such lighting is required to read outside. The term dusk usually refers to astronomical dusk, or the darkest part of twilight before night begins.

twilight

Noun

1. The soft light in the sky seen before the rising and (especially) after the setting of the sun, occasioned by the illumination of the earth’s atmosphere by the direct rays of the sun and their reflection on the earth.
2. The time when said light is visible; the period between daylight and darkness.

Adjective

1. Pertaining to or resembling twilight; faintly illuminated; obscure.
2. Synonym of mesopelagic (“Describing the pelagic zone of the ocean between the photic epipelagic and the aphotic bathypelagic zones, characterized by very minimal light.”)

dusk

Adjective

1. Tending to darkness or blackness; moderately dark or black; dusky.

Noun

1. The time after the sun has set but when the sky is still lit by sunlight; the evening twilight period.
2. A darkish colour.