Twilight is the period between sunset and complete darkness, with its duration dependent on atmospheric conditions and the angle of the sun below the horizon.
Twilight is the brief period between sunset and complete darkness. Astronomers define morning twilight as beginning when the Sun is 18° below the horizon, and evening twilight extends until the Sun sinks more than 18° below the horizon. The duration of twilight depends on the height of the atmosphere and typically lasts until the sun has sunk about 18° below the horizon.
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