2007
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Civil twilight is the brightest of the twilight phases. How is it defined and when does it start and end? What are civil dawn and civil dusk?
Midtown Manhattan during civil twilight, demonstrating blue hour. Civil twilight is the time when the geometric center of the Sun is between the horizon and 6° below the horizon. Civil twilight is the period when enough natural light remains that artificial light in towns and cities is not needed.
21 nov 2023 · Civil twilight starts at sunset and ends roughly 45 minutes later, when the sun’s center has plunged six degrees below the horizon—equal to 12 times its own width. That’s when streetlights must be on, according to most municipal ordinances. Nautical twilight
1 feb 2022 · Civil twilight is one of the technical divisions of twilight based on the angle of the sun in relation to the horizon and the resulting level of light in the sky. Civil twilight is the lightest (or least dark) of the three—when the sun is between 0 and 6 degrees below the horizon.
5 lug 2023 · Most of us think of twilight as a single period of transition from bright day to deep night, but there are actually three twilights: civil, nautical, and astronomical. Each is defined by how...
