Civil Twilight: Sun Calculator

Know when night begins – EASA and FAA – and when golden hour starts, for any date and place. New: offline airport search, PDF reports, iPad and iPhone Duo.

Civil Twilight gives you a clear view of the Sun’s daily cycle and aviation night boundaries for any location and date.

Designed for pilots and flight students, and useful for photographers and anyone planning around daylight.

AVIATION

• EASA night boundaries based on civil twilight. • FAA general night under 14 CFR 1.1. • Position-light period under 14 CFR 91.209. • Passenger Night Currency period under 14 CFR 61.57(b).

SUN, TWILIGHT AND MOON

• Sunrise and sunset. • Civil, nautical and astronomical dawn and dusk as complete intervals. • Morning and evening Golden Hour. • Moon phase and approximate illumination. • Clear states for midnight sun, polar night and thresholds that are not crossed.

LOCATION AND TIME

Use your current position temporarily, select a point on the map or save locations for later. Times are shown in the selected location’s local time, with optional UTC.

LOCAL-FIRST AND PRIVATE

No account, advertising, analytics or tracking. Saved locations remain on your device. Astronomical calculations and saved locations work offline. Apple Maps, reverse geocoding and resolving a new time zone may require a network connection.