/// <summary>
/// Calculate solar elongation for a celestial body.
/// </summary>
/// <remarks>
/// Solar elongation is the angle between the lines of sight from the Earth to the Sun and from the Earth to the celestial body.
/// </remarks>
/// <returns>solarElongationDeg -- Solar elongation, in degrees</returns>
public double SolarElongation(double raHour, double raMin, double raSec, double decDeg, double decMin, double decSec, double gwdateDay, int gwdateMonth, int gwdateYear)
{
var sunLongitudeDeg = PAMacros.SunLong(0, 0, 0, 0, 0, gwdateDay, gwdateMonth, gwdateYear);
var sunRAHours = PAMacros.DecimalDegreesToDegreeHours(PAMacros.EcRA(sunLongitudeDeg, 0, 0, 0, 0, 0, gwdateDay, gwdateMonth, gwdateYear));
var sunDecDeg = PAMacros.EcDec(sunLongitudeDeg, 0, 0, 0, 0, 0, gwdateDay, gwdateMonth, gwdateYear);
var solarElongationDeg = PAMacros.Angle(sunRAHours, 0, 0, sunDecDeg, 0, 0, raHour, raMin, raSec, decDeg, decMin, decSec, PAAngleMeasure.Hours);
return(Math.Round(solarElongationDeg, 2));
}