Civil Twilight Definition in the Continental United States
Verified from official sourcesAC 107-2A ¶ 5.7Version 1Effective -Verified 22 August 2026
In plain language
If you are flying in the continental US, civil twilight is precisely the 30-minute window before sunrise and the 30-minute window after sunset.
Requirement as structured
In the continental United States, evening civil twilight is from sunset to 30 minutes after sunset, and morning civil twilight is from 30 minutes prior to sunrise until sunrise.
Original regulatory text
In the continental United States, evening civil twilight is the period of sunset until 30 minutes after sunset and morning civil twilight is the period of 30 minutes prior to sunrise until sunrise.
Applies when
- country
- United States
- environment
- continental United States
- regulatory category
- General