Civil Twilight Calculator
$0.99
1.25for iPhone, iPad and more
Age Rating
Civil Twilight Calculator Screenshots
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!
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!
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What's New in the Latest Version 1.25
Last updated on Sep 26, 2021
Old Versions
Updated for iOS 15!
fixed a "Night Mode" screen issue
fixed a "Night Mode" screen issue
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Version History
1.25
Sep 26, 2021
Updated for iOS 15!
fixed a "Night Mode" screen issue
fixed a "Night Mode" screen issue
1.24
May 9, 2021
Updated for iOS 14
Refined Dark Mode
Tweaked screen layouts
Refined Dark Mode
Tweaked screen layouts
1.23
May 19, 2020
Freshened up for iOS 13+
Minor bug fixes
Improved formatting of Help files
Minor bug fixes
Improved formatting of Help files
1.21
Mar 8, 2020
More improvements to the User Interface!
Restored Location and Date controls to iPad in Landscape
Restored Location and Date controls to iPad in Landscape
1.20
Mar 7, 2020
iOS 9.3 - 13 Compatible
Improved Graphics
Many internal code improvements
Tiny bugs chased and squashed!
Improved Graphics
Many internal code improvements
Tiny bugs chased and squashed!
1.11
May 10, 2018
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
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
1.10
Feb 2, 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
• 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
1.09
Mar 1, 2017
Now includes Nautical and Astronomical Twilight times as requested!
User interface tweaks
User interface tweaks
1.0
Oct 20, 2016
Civil Twilight Calculator FAQ
Click here to learn how to download Civil Twilight Calculator in restricted country or region.
Check the following list to see the minimum requirements of Civil Twilight Calculator.
iPhone
Requires iOS 13.0 or later.
iPad
Requires iPadOS 13.0 or later.
iPod touch
Requires iOS 13.0 or later.
Civil Twilight Calculator supports English