Sunrise and sunset calculation in C#

Heavily cleaned up and simplified C# library to calculate the sunrise and sunset for a location on earth on any given date. Compiled for .NET Standard 2.0, .NET Framework 4.5.2, .NET Framework 4.7.2 and .NET Core 2.0.

Usage

// Date for which to calculate the sunrise and sunset
var date = DateTime.Today;

// Latitude for which to calculate the sunrise/sunset
var latitude = 52.3702157;

// Longitude for which to calculate the sunrise/sunset
var longitude = 4.8951679;
            
// Hours from UTC which this location is in
var utcOffset = TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now).Hours;

// Write the output to the screen
Console.WriteLine("Date: " + date.ToLongDateString());
Console.WriteLine("UTC Offset: " + utcOffset);
Console.WriteLine("Coordinates: LONG " + longitude + " LAT " + latitude);
Console.WriteLine("Sunrise: " + SunSetRiseLib.SunriseAt(latitude, longitude, date, utcOffset));
Console.WriteLine("SunSet: " + SunSetRiseLib.SunsetAt(latitude, longitude, date, utcOffset));

NuGet

Also available as NuGet Package: KoenZomers.SunSetRise

Version History

Version 1.2.0.3 - June 4, 2019

• Recreated package to target .NET Standard 2.0, .NET Framework 4.5.2, .NET Framework 4.7.2 and .NET Core 2.0

Version 1.2.0.1 - March 3, 2019

• Removed build for .NET Framework 2.0 and 3.5 as these are not supported anymore. Recreated package to target .NET Framework 4.0, 4.5 and 4.6 and .NET Standard 1.1 and 2.0

Version 1.2.0.0 - November 12, 2018

• Change in the way the sunrise and sunsets are being calculated following https://www.esrl.noaa.gov/gmd/grad/solcalc/
• Various bugfixes
• Timezones in between timezones, i.e. Darwin Australia at UTC+9.5 are now also supported
• Unit Tests have been added
• Library is now compiled against .NET Standard 2.0
• Documentation XML is now included in the NuGet package so you'll see the method documentation in the project where you add the NuGet package
• This update may contain non backwards compatible changes in method calls. Please validate your code and the expected outcome when upgrading.

Huge thanks to microalps for doing all the hard work behind this excellent update!

Version 1.1.2.1 - October 8, 2017

Minor update to return a NULL when the sunset or sunrise can't be calculated based on the provided lat or long in combination with the timezone. Before it would throw an exception instead.

Version 1.1.2.0 - August 16, 2017

Minor update just to accommodate the NuGet package name change to get it aligned with my other NuGet packages

Version 1.1.1.0 - March 27, 2017

Changed namespace of code to make it look cleaner when used

Version 1.1.0.0 - March 27, 2017

Initial version as forked. Cleaned up code, compiled against .NET 4.6.2 and signed the assemblies.

Credits

Forked from https://github.com/sely2k/SunSetRiseLib

Feedback

Comments\suggestions\bug reports are welcome!

Koen Zomers mail@koenzomers.nl