Dusk

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Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just before nightfall.^[1] 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 (when Earth rotates to a point at which the center of the Sun's disk is 6° below the local horizon), such lighting is required to read outside.^[2] The term dusk usually refers to astronomical dusk, or the darkest part of twilight before night begins.