What are the three types of twilight?
Quick Answer: The three types of twilight are civil twilight, nautical twilight, and astronomical twilight. Each is defined by how far the sun is below the horizon, affecting how much natural light you see after sunset or before sunrise.
Civil twilight happens when the sun is less than 6 degrees below the horizon. There's still plenty of light, so you can do most outdoor activities without artificial lighting.
Nautical twilight occurs when the sun is between 6 and 12 degrees below the horizon. The horizon is still visible at sea, helping sailors navigate by the stars.
Astronomical twilight is when the sun is between 12 and 18 degrees below the horizon. The sky is dark enough for astronomers to observe stars and other celestial objects without interference from sunlight.