Civil Twilight Definition in Alaska

In plain language

If you are flying in Alaska, you cannot assume civil twilight is exactly 30 minutes. You must look up the specific twilight duration in The Air Almanac for your latitude and date.

Requirement as structured

In Alaska, the definition of civil twilight differs from the continental US and is advised to be determined using The Air Almanac.

Original regulatory text

In Alaska, the definition of civil twilight differs and is described in The Air Almanac.

Applies when

country

United States

environment

Alaska

regulatory category

General