Civil dawn is the period where the Sun is 6 degrees below the horizon.With more light, it is possible to start to observe objects and items. Nautical dawn the period where the Sun is 12 degrees below the horizon.During this time, the sky will not be entirely dark. Astronomical dawn the period when the Sun is 18 degrees below the horizon.Dawn is the words used to describe the first appearance of light that appears in the the sky before the sun rises.įrom an astronomical perspective, dawn marks the beginning of twilight.Īt this time, the sun will still be below the horizon, so sunlight is still relatively sparse and the landscape quite dim.ĭawn is often classified into three different phases.
