Twilight has precise beginning and ending points. Civil, nautical, and astronomical twilight begin or end when the Sun lies 6, 12, and 18 degrees below the horizon, respectively. Astronomical twilight provides the darkest skies.
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Twilight has precise beginning and ending points. Civil, nautical, and astronomical twilight begin or end when the Sun lies 6, 12, and 18 degrees below the horizon, respectively. Astronomical twilight provides the darkest skies.