public void EquationOfTimeOnFebruary3()
{
var B = CalculationAbbreviations.DayOnCircle(localTime.DayOfYear);
var result = SolarTime.EquationOfTime(B);
Assert.AreEqual(-13.5, result, 0.1);
}
/// <summary>
/// Spencer 1971 model, as defined in Equation 1.6.1b on page 14
/// </summary>
public double DeclinationAngle(double dayOfYear)
{
var B = CalculationAbbreviations.DayOnCircle(dayOfYear);
return(0.006918
- 0.399912 * Math.Cos(B) + 0.070257 * Math.Sin(B)
- 0.006758 * Math.Cos(2 * B) + 0.000907 * Math.Sin(2 * B)
- 0.002697 * Math.Cos(3 * B) + 0.00148 * Math.Sin(3 * B));
}