Civil Twilight Calculator1.26 - App Store
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Publisher Description
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!
Version History Updated for iOS 26.
many small code tweaks. 1.26 Jan 5 Updated for iOS 15!
fixed a "Night Mode" screen issue 1.25 09/26/2021 Updated for iOS 14
Refined Dark Mode
Tweaked screen layouts 1.24 05/09/2021 Freshened up for iOS 13+
Minor bug fixes
Improved formatting of Help files 1.23 05/19/2020 More improvements to the User Interface!
Restored Location and Date controls to iPad in Landscape 1.21 03/08/2020 iOS 9.3 - 13 Compatible
Improved Graphics
Many internal code improvements
Tiny bugs chased and squashed! 1.20 03/07/2020 Added Day of Week to Date Picker and Main View
Expanded Allowable Date Range
Improved User Interface and made it iPhone X ready
Fixed bug in calculation of Time until Sunset or Sunrise when in GMT mode 1.11 05/10/2018 Our users have asked for more App features! Here they are:
• Switch between GMT and Local Time
• Day or Night Mode
• Improved Time Zone placement
• Many UI Tweaks
• Better Startup Mode
• Live GPS updates
• Remove App Rating nudge 1.10 02/02/2018 Now includes Nautical and Astronomical Twilight times as requested!
User interface tweaks 1.09 03/01/2017 1.0 10/20/2016
About Civil Twilight Calculator
The company that develops Civil Twilight Calculator is Aviametrix, LLC. The latest version released by its developer is 1.26.
To install Civil Twilight Calculator on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2026-10-15 and was downloaded 0 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Civil Twilight Calculator as malware if the download link is broken.
How to install Civil Twilight Calculator on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the Civil Twilight Calculator is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After Civil Twilight Calculator is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
Program Details
System requirements
Download information
Pricing
Version History
version 1.26
posted on 2026-10-15
Version History Updated for iOS 26.
many small code tweaks. 1.26 Jan 5 Updated for iOS 15!
fixed a "Night Mode" screen issue 1.25 09/26/2021 Updated for iOS 14
Refined Dark Mode
Tweaked screen layouts 1.24 05/09/2021 Freshened up for iOS 13+
Minor bug fixes
Improved formatting of Help files 1.23 05/19/2020 More improvements to the User Interface!
Restored Location and Date controls to iPad in Landscape 1.21 03/08/2020 iOS 9.3 - 13 Compatible
Improved Graphics
Many internal code improvements
Tiny bugs chased and squashed! 1.20 03/07/2020 Added Day of Week to Date Picker and Main View
Expanded Allowable Date Range
Improved User Interface and made it iPhone X ready
Fixed bug in calculation of Time until Sunset or Sunrise when in GMT mode 1.11 05/10/2018 Our users have asked for more App features! Here they are:
• Switch between GMT and Local Time
• Day or Night Mode
• Improved Time Zone placement
• Many UI Tweaks
• Better Startup Mode
• Live GPS updates
• Remove App Rating nudge 1.10 02/02/2018 Now includes Nautical and Astronomical Twilight times as requested!
User interface tweaks 1.09 03/01/2017 1.0 10/20/2016
version 1.26
posted on 2026-01-05
Updated for iOS 26.
many small code tweaks.
version 1.25
posted on 2021-09-26
Sep 26, 2021 Version 1.25
Updated for iOS 15!
fixed a "Night Mode" screen issue
version 1.24
posted on 2021-05-09
May 9, 2021 Version 1.24
Updated for iOS 14
Refined Dark Mode
Tweaked screen layouts
version 1.23
posted on 2020-05-19
May 19, 2020 Version 1.23
Freshened up for iOS 13+
Minor bug fixes
Improved formatting of Help files
version 1.21
posted on 2020-03-08
Mar 8, 2020 Version 1.21
More improvements to the User Interface!
Restored Location and Date controls to iPad in Landscape
version 1.20
posted on 2020-03-07
Mar 7, 2020 Version 1.20
iOS 9.3 - 13 Compatible
Improved Graphics
Many internal code improvements
Tiny bugs chased and squashed!
version 1.11
posted on 2018-05-10
May 10, 2018 Version 1.11
Added Day of Week to Date Picker and Main View
Expanded Allowable Date Range
Improved User Interface and made it iPhone X ready
Fixed bug in calculation of Time until Sunset or Sunrise when in GMT mode
version 1.0
posted on 2016-10-21
version 1.23
posted on 1970-01-01
19. Mai 2020 Version 1.23
Freshened up for iOS 13+
Minor bug fixes
Improved formatting of Help files
Disclaimer
Official App Store Link
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