What is the primary use of Civil Twilight according to nighttime definitions?

Civil twilight is defined as the period when the sun is between 0 and 6 degrees below the horizon, and there is just enough natural light for most outdoor activities, such as driving or flying. The primary relevance of civil twilight in relation to logging nighttime is that it is considered a time when pilots must adhere to specific regulations that apply to night flying.

During civil twilight, while there may be some ambient light, it is not sufficient for flying without proper artificial illumination. Therefore, pilots must be mindful of logging flight time correctly, as this impacts their experience and currency requirements for flying at night.

This distinction means that activities related to navigation lights, air traffic control guidance, or passenger transport certification are not the primary focus of civil twilight. Those aspects are certainly important, but they fall under different categories and regulations within aviation.