What defines Civil Twilight?

Civil twilight is defined as the period when the center of the sun is not more than 6 degrees below the celestial horizon. During this time, there is enough natural light for most outdoor activities without the need for additional lighting. It marks the transition between day and night, enabling visibility while still allowing for the sunset to occur.

This definition highlights the crucial aspect of civil twilight, which is the remaining light in the sky despite the sun being positioned below the horizon. Therefore, it suggests a state of partial illumination that facilitates activities like navigation or other outdoor endeavors without the full darkness of night.