Civil Twilight for Watch

The only watch-native twilight calculator that works without a phone or internet.

Built for pilots and mariners who need regulatory-accurate light times, not weather app approximations. Civil Twilight has been calculating sun position on the wrist for 7 years—now fully compatible watchOS 27. Trust the original, time-tested solar calculator designed for pilots, mariners, and outdoor navigators who demand absolute reliability. Civil Twilight for Watch has been completely re-engineered for watchOS 27 to run entirely on your wrist without relying on your iPhone or an internet connection.

Whether you are logging flight hours under visual flight rules (VFR), planning a night passage, or tracking the sun on a remote trail, Civil Twilight delivers instant, precise astronomical calculations utilizing advanced onboard math and your exact GPS coordinates.

Why it’s different:

· True Offline Math: Uses GPS position and astronomical algorithms. No network, no phone. Civil Twilight for Watch finds your location, and calculates the sun position without going out on the internet like the other apps. Anywhere in the world! In your plane, on your boat, out on a hike! This is self-contained on the Watch and doesn't need the phone nearby either! Accurate to about a minute through the year 2050. Works at altitude, offshore, or in airplane mode.
· Three Glanceable Views: Tabular data for precision, a unique Sun Clock dial for situational awareness, and an Earth Globe showing the terminator at your exact location.
· No Signal? No Problem: Includes a built-in database of 100 cities and almost 600 airports for when GPS is unavailable or you want to pre-plan. Set your personal favs for pre-planning or just curiousity.
· Full family of watch face complications

Built for compliance: Pilots logging night time and boaters assessing light conditions get minute-accurate civil, nautical, and astronomical twilight through 2050.

Built by an independent developer with a lifetime license: no subscriptions, no in-app purchases, and zero user tracking.