Civil Twilight is best described as:

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Multiple Choice

Civil Twilight is best described as:

Civil twilight is the phase after sunset or before sunrise when there is enough light for most outdoor activities, even though the sun is below the horizon. It occurs when the sun is between 0 and 6 degrees below the horizon, so the upper limb remains below the horizon and the center is about 6 degrees below. This captures the boundary where civil twilight ends and nautical twilight begins. The moment when the upper limb is on or just crossing the horizon corresponds to sunrise or sunset, not civil twilight; total darkness would be night, and the center exactly on the horizon is the geometrical moment of sunrise/sunset, not the civil twilight period.

Civil twilight is the phase after sunset or before sunrise when there is enough light for most outdoor activities, even though the sun is below the horizon. It occurs when the sun is between 0 and 6 degrees below the horizon, so the upper limb remains below the horizon and the center is about 6 degrees below. This captures the boundary where civil twilight ends and nautical twilight begins. The moment when the upper limb is on or just crossing the horizon corresponds to sunrise or sunset, not civil twilight; total darkness would be night, and the center exactly on the horizon is the geometrical moment of sunrise/sunset, not the civil twilight period.

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