Definition of Civil Twilight (Except Alaska)

In plain language

In all US states except Alaska, civil twilight is the 30 minutes before sunrise and the 30 minutes after sunset.

Requirement as structured

Outside of Alaska, civil twilight is defined as the 30-minute period before official sunrise and the 30-minute period after official sunset.

Original regulatory text

For purposes of paragraph (b) of this section, civil twilight refers to the following: (1) Except for Alaska, a period of time that begins 30 minutes before official sunrise and ends at official sunrise; (2) Except for Alaska, a period of time that begins at official sunset and ends 30 minutes after official sunset;

Applies when

country

United States

environment

outside_alaska

regulatory category

General