According to AFI 11-202, Volume 3, when is it considered "night"?

The definition of "night" according to AFI 11-202, Volume 3, is specifically tied to the concept of civil twilight. Civil twilight refers to the time when the sun is just below the horizon, allowing for enough natural light for most outdoor activities. The term "night" is recognized as the period between the end of evening civil twilight and the start of morning civil twilight.

Choosing the period between evening and morning civil twilight accurately captures the time frame when operational conditions are classified as night, affecting flight operations. This understanding is critical for pilots and aviation personnel to ensure safety and compliance with regulations in various phases of flight and navigation.