# Civil Twilight Calculator

> Offline calculator for sunrise, sunset, and twilight times with FAA regulations. (iPhone/iPad app by Aviametrix, LLC.)

- Source: https://appshunter.io/ios/app/civil-twilight-calculator/id1163850946 (this page in markdown: same URL + `.md`)
- Developer: [Aviametrix, LLC](https://appshunter.io/developer/1120306811)
- Category: Lifestyle, Weather
- Price: $0.99
- Rating: 5.00/5 from 5 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 8 MB
- Languages: American English
- Released: 2016-10-21
- Data updated: 2026-08-21
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/civil-twilight-calculator/id1163850946/reviews.md

## What is 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!

## Key features

- Offline celestial calculations
- Sunrise and sunset at GPS location
- Twilight times (Civil, Nautical, Astronomical)
- Data for 11,000+ airports
- 60 years of historical/future data
- Includes FAA regulations

## Chart rankings

- #195 in Top Paid · Lifestyle (US App Store)

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/civil-twilight-calculator/id1163850946/reviews.md

### 5/5 — Simple to use and great customer support

*2021-05-09*

This app does exactly what it says and is super simple to use. Get the information you are needing quickly. Great response time and support from the developer when I encountered an issue.

## Frequently asked questions about Civil Twilight Calculator

### Does Civil Twilight Calculator work offline?

Yes, Civil Twilight Calculator performs all core celestial calculations internally, meaning it does not require an internet connection for its primary functions like calculating sunrise, sunset, and twilight times at your GPS location.

### How accurate are the twilight calculations in Civil Twilight Calculator?

The app calculates sunrise and sunset accurately forwards and backwards in time for 60 years. It also offers improved time zone accuracy when an internet connection is available.

### What types of twilight does Civil Twilight Calculator provide?

Civil Twilight Calculator provides regular (standard) Sunrise/Sunset, Civil Twilight, Nautical Twilight, and Astronomical Twilight. This comprehensive data is useful for various outdoor activities and aviation needs.

### Can I find twilight times for specific airports using Civil Twilight Calculator?

Yes, the app includes built-in coordinates for over 11,000 airports worldwide, allowing you to find sunrise and sunset times for any of them directly within the application.

### What FAA regulations are included in Civil Twilight Calculator?

Civil Twilight Calculator contains the relevant FAA regulations for daylight and night definitions, serving as a quick reference for pilots and aviation professionals who need to understand these distinctions.

### What devices is Civil Twilight Calculator compatible with?

Civil Twilight Calculator is available for iPhone, iPad, and iPod devices. It was last updated on January 5, 2026, indicating ongoing support.

### How much does Civil Twilight Calculator cost?

Civil Twilight Calculator is a paid application, priced at $0.99. It does not feature in-app purchases or advertisements, offering a straightforward purchase for full functionality.

### Does Civil Twilight Calculator have ads?

No, Civil Twilight Calculator is ad-free. The application does not contain advertisements, providing an uninterrupted user experience.

## Version history (last 5 releases)

### 1.26 — 2026-01-05

Updated for iOS 26.   
many small code tweaks.

### 1.25 — 2021-09-26

Updated for iOS 15!
fixed a "Night Mode" screen issue

### 1.24 — 2021-05-09

Updated for iOS 14
Refined Dark Mode
Tweaked screen layouts

### 1.23 — 2020-05-19

Freshened up for iOS 13+
Minor bug fixes
Improved formatting of Help files

### 1.21 — 2020-03-08

More improvements to the User Interface!
Restored Location and Date controls to iPad in Landscape

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All apps by Aviametrix, LLC: https://appshunter.io/developer/1120306811

## Related topics

[civil twilight](https://appshunter.io/ios/topics/civil-twilight) · [civil twilight calculator](https://appshunter.io/ios/topics/civil-twilight-calculator) · [a civil twilight](https://appshunter.io/ios/topics/a-civil-twilight) · [twilight nautical](https://appshunter.io/ios/topics/twilight-nautical)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*