Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

Civil Twilight Calculator 螢幕截圖

iPad

iPhone

About Civil Twilight Calculator

Everyone who works outside needs to know about daylight hours!

Pilots often need to know when night occurs. The FAA uses several different times of day for calling night vs. day, depending on the purpose.

Most Apps find the twilight times by going to a database on the internet. That means you need a network connection to use them.

This app is unique because it does all the celestial calculations internally! No internet required! Find the start of night at your destination while you are still in the air!

Lots of features:

Find sunrise and sunset at your current GPS location. Update sun calculations and sun dial every minute and every 10 km of movement.

Find sunrise and sunset at any airport in the world (The app has built-in coordinates for 11,000 airports around the world)

If you are connected (WiFi or Cell Data), you can look up the twilight times at any address in the world. Internet or cell access now also improves time zone accuracy.

The App calculates sunrise and sunset accurately forwards and backwards in time for 60 years.

The App calculates regular (standard) Sunrise/Sunset, Civil Twilight, Nautical Twilight, and Astronomical Twilight.

The App contains the relevant FAA regulations if you need a refresher!