/// <summary>
/// Returns the extraterrestrial radiation incident on the plane normal to the radiation
/// Calculation is based on equation 1.4.1b (page 9)
/// </summary>
/// <param name="dateTime">Date on which the extraterrestrial radiation shall be computed</param>
public static double GetExtraterrestrialRadiation(DateTime dateTime)
{
int dayOfYear = dateTime.DayOfYear;
double B = CalculationAbbreviations.DayOnCircle(dayOfYear);
return(NaturalConstants.SolarConstant_W_per_m2 * (
1.000110 + 0.034221 * Math.Cos(B) + 0.001280 * Math.Sin(B)
+ 0.000719 * Math.Cos(2 * B) + 0.000077 * Math.Sin(2 * B)
));
}
private static double SolarTimeDeltaMinutes(int dayOfYear, double longitude, TimeSpan timeDelta)
{
double localStandardMeridian = GetLocalStandardMeridian(timeDelta);
double B = CalculationAbbreviations.DayOnCircle(dayOfYear);
double equationOfTime = EquationOfTime(B);
double timeDeltaMinutes = 4 * (longitude - localStandardMeridian) + equationOfTime;
return(timeDeltaMinutes);
}
