Sunset Time is described as 'Know the time of sunrise and sunset at any time' and is an app. There are more than 10 alternatives to Sunset Time for a variety of platforms, including iPhone, iPad, Web-based, Android and Mac apps. The best Sunset Time alternative is Positional, which is both free and Open Source. Other great apps like Sunset Time are Skylight Forecast, Sun Surveyor, PicPlanner and Suncalc.
Solartopo provides global sunrise, sunset data with topographic analysis, precise solar orbit services calculating azimuth and zenith angles, solar cell alignment advice, and hilly terrain sun-exposure finder. Calculations consider time zones, light refraction for future predictions till year 6000.
