Calculates the sunrise and sunset for a given date and location (using GEO coordinates). This library uses the method outlined NOAA Solar Calculations Day spreadsheet found at http://www.esrl.noaa.gov/gmd/grad/solcalc/calcdetails.html.
Add this to your project in Visual Studio using NuGet Package Manager UI and ID SolarCalculator or using the Package Manager Console.
PM> Install-Package SolarCalculator
Starting in version 3.3.0 there are two new properties for checking if a date is a Polar Day (IsPolarDay) or Polar Night (IsPolarNight). If the combination of date and location result in a Polar Day or Polar Night, the values for Sunrise and Sunset are as follows:
Polar Day: Sunrise = DateTime.MinValue, Sunset = DateTime.MaxValue
Polar Night: Sunrise = DateTime.MaxValue, Sunset = DateTime.MinValue
The sample code below shows how to initialize and call the Solar Calculator to get the sunrise and sunset for the given location.
using System;
using Innovative.SolarCalculator;
//
// Geo coordinates of Oak Street Beach in Chicago, IL
//
// NOTE: the .Date is not necessary but is included to demonstrate that time input
// does not affect the output. Time will be returned in the current time zone so it
// will need to be adjusted to the time zone where the coordinates are from (there
// are services that can be used to get time zone from a latitude and longitude position).
//
TimeZoneInfo cst = TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time");
SolarTimes solarTimes = new SolarTimes(DateTime.Now.Date, 41.9032, -87.6224);
DateTime sunrise = TimeZoneInfo.ConvertTimeFromUtc(solarTimes.Sunrise.ToUniversalTime(), cst);
//
// Display the sunrise
//
Console.WriteLine($"View the sunrise across Lake Michigan from Oak Street Beach in Chicago at {sunrise.ToLongTimeString()} on {sunrise.ToLongDateString()}.");
//
// Geo coordinates of Benton Harbor/Benton Heights in Michigan
//
TimeZoneInfo est = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
SolarTimes solarTimes = new SolarTimes(DateTime.Now, 42.1543, -86.4459);
DateTime sunset = TimeZoneInfo.ConvertTimeFromUtc(solarTimes.Sunset.ToUniversalTime(), est);
//
// Display the sunset
//
Console.WriteLine($"View the sunset across Lake Michigan from Benton Harbor in Michigan at {sunset.ToLongTimeString()} on {sunset.ToLongDateString()}.");