This class library gives you varios sunrise and sunset values depening on your date and longiture and latitude. It bases its implementation on the NOAA Solar Calculator.
This is strongly influenced by the javascript library solar-calc
https://github.com/jonhester/solar-calc
https://www.esrl.noaa.gov/gmd/grad/solcalc/index.html
double latitude = 59.370272;
double longitude = 18.000767;
time_t now = time(NULL);
SunLight sunLight(Date(now), latitude, longitude);
time_t sunrise = sunLight.sunrise();
time_t sunset = sunLight.sunset();
std::cout << "sunrise: " << asctime( gmtime(&sunrise)) << std::endl;
std::cout << "sunset: " << asctime( gmtime(&sunrise)) << std::endl;
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