USA HISTORY

Detailed explanation-1: -In its most general sense, twilight is the period of time before sunrise and after sunset, in which the atmosphere is partially illuminated by the sun, being neither totally dark or completely lit.

Detailed explanation-2: -In mid latitudes, astronomical twilight can last about 1/2 hour from fall through spring but up to an hour in summer. Astronomical twilight begins about an hour to 1 1/2 hours after sunset for mid latitudes.

Detailed explanation-3: -There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).

Detailed explanation-4: -Astronomical twilight occurs when the sun is between 12 degrees and 18 degrees below the horizon. Night is classified when the sun is 18 degrees or farther below the horizon.

Detailed explanation-5: -(ˈtwaɪˌlaɪt ˈaʊəz ) noun. the period in which there occurs soft diffused light due to the sun being just below the horizon, esp following sunset.