Under 14 CFR § 107.29(c)(3), how is civil twilight defined for small UAS operations conducted in Alaska?

Why: 14 CFR § 107.29(c)(3) defines civil twilight in Alaska as the period of civil twilight as defined in the Air Almanac, rather than the fixed 30-minute windows that § 107.29(c)(1)-(2) set for the rest of the country.

• The fixed 30-minute windows in § 107.29(c)(1)-(2) are expressly limited to operations "except for Alaska"; Alaska instead uses the Air Almanac's own civil-twilight definition because of its extreme and variable daylight patterns.
• The anti-collision lighting requirement of § 107.29(b) still applies during Alaska's civil twilight period; only the definition of when that period occurs differs, not whether the lighting requirement exists.