Sunrise and Sunset calendar. Sunrise, Sunset, Twilight, and Daylight Hours any city in the world
Sunrise, Sunset, and Twilight - Science Pickle
Twilight Types
Beginning/end of twilight - General Observing and Astronomy - Cloudy Nights
About Daylight Hours, Twilight, Civil Twilight, Nautical Twilight and Astronomical Twilight
GitHub - BinaryBirds/Sunlight: Calculate dawn, dusk, golden and blue hour times by using various algorithms.
How do we get ship's position by star sight ? - MySeaTime
Astronomical Twilight – Definition and Explanation
Civil Twilight for Watch on the App Store
Civil Twilight Calculator on the App Store
Sun Position Calculator 1.1.0 Free Download
Skyclock Latest Version v1.5-4-gbbc2b37 for Android
SunriseSunset.com - Sunrise Sunset Calculator App for Microsoft Windows
About Daylight Hours, Twilight, Civil Twilight, Nautical Twilight and Astronomical Twilight
Nautical Twilight – Definition and Explanation
Civil Twilight Calculator by Aviametrix, LLC
Astronomical Twilight – Definition and Explanation
trigonometry - How to calculate civil twilight timings? - Mathematics Stack Exchange
Sun/Moon Calculator Reference
How do we get ship's position by star sight ? - MySeaTime
Brian B.'s Climate Blog: Daylight-Twilight-Astronomical Maps
Deep Sky Darkness calculator
Civil Twilight Calculator on the App Store
Twilight - Wikipedia
Sun rise, set and twilight times calculated using a simple iterative scheme and implemented as a QBASIC program, an Excel spreadsheet using VBA and as a plain spreadsheet.