What are the three types of twilight?
Quick response: The three types of twilight are civil twilight, nautical twilight, and astronomical twilight. Each is defined by the angle of the sun below the horizon, which affects the amount of natural light visible after sunset or before sunrise.
Civil twilight occurs when the sun is less than 6 degrees below the horizon. There is still enough light that most outdoor activities can be performed without artificial lighting.
Nautical twilight happens when the sun is between 6 and 12 degrees below the horizon. The horizon line is still visible at sea, helping sailors orient themselves 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.