// don't use constructs like DateTime, for easy translation to C
public EquilibriumTide(int epochStartYear, int epochStartMonth, int epochStartDay, int epochLengthInDays)
{
this.Constituents = HarmonicConstituent.GetInitializedConstituents();
int epochStartJulianDay = GetJulianDay(epochStartYear, epochStartMonth, epochStartDay); //DAYJ
int epochLengthInHours = epochLengthInDays * 24;
CalculateNodeFactors(epochStartYear, epochStartJulianDay, epochLengthInDays * 24 / 2);
CalculateEquilibriumPhases(epochStartYear, epochStartJulianDay, 0, epochLengthInHours / 2);
}
/// <summary>
/// return an array of 37 harmonic constituents, initialized with descriptions and speeds.
/// later we will update Phases and Amplitudes based on locale, and also update
/// EquilibriumPhases and NodeFactors based on the theoretical equilibrium tide calculated for our prediction epoch.
/// </summary>
/// <returns>array of all harmonic constituents</returns>
public static HarmonicConstituent[] GetInitializedConstituents()
{
HarmonicConstituent[] constituents = new HarmonicConstituent[Constants.ConstitutentArraySize];
for (int i = 0; i < Constants.ConstitutentArraySize; i++)
{
constituents[i] = new HarmonicConstituent();
}
// Speeds are in degrees per hour. For example, S2 completes a 360 degree cycle in 12 hours. (360/30 = 12)
// T + h gives us rotation of earth with respect to fixed stars. So T + h - s gives us the lunar day.
constituents[Constants.M2].ID = "M2";
constituents[Constants.M2].Description = "Principal Lunar, Semi-Diurnal (1 cycle = 1/2 rotation of earth with respect to moon)";
constituents[Constants.M2].Speed = 2.0 * Constants.T - 2.0 * Constants.s + 2.0 * Constants.h; // 28.9841042;
constituents[Constants.S2].ID = "S2";
constituents[Constants.S2].Description = "Principal Solar, Semi-Diurnal (1 cycle = 1/2 rotation of earth with respect to sun)";
constituents[Constants.S2].Speed = 2.0 * Constants.T; // 30.0000000;
constituents[Constants.N2].ID = "N2";
constituents[Constants.N2].Description = "Principal lunar elliptic, semidiurnal (1 cycle = 1/2 rotation of earth with respect to moon's perigee)";
constituents[Constants.N2].Speed = 2.0 * Constants.T - 3.0 * Constants.s + 2.0 * Constants.h + Constants.p; // 28.4397295;
constituents[Constants.K1].ID = "K1";
constituents[Constants.K1].Description = "Combined Sun-Moon angle (1 cycle = full Rotation of earth with respect to fixed stars)";
constituents[Constants.K1].Speed = Constants.T + Constants.h; // 15.0410686;
constituents[Constants.M4].ID = "M4";
constituents[Constants.M4].Description = "Shallow water";
constituents[Constants.M4].Speed = 57.9682084;
constituents[Constants.O1].ID = "O1";
constituents[Constants.O1].Description = "Principal lunar declination";
constituents[Constants.O1].Speed = Constants.T - 2.0 * Constants.s + Constants.h; // 13.9430356;
constituents[Constants.M6].ID = "M6";
constituents[Constants.M6].Description = "Shallow water";
constituents[Constants.M6].Speed = 86.9523127;
constituents[Constants.MK3].ID = "MK3";
constituents[Constants.MK3].Description = "";
constituents[Constants.MK3].Speed = 44.0251729;
constituents[Constants.S4].ID = "S4";
constituents[Constants.S4].Description = "";
constituents[Constants.S4].Speed = 60.0;
constituents[Constants.MN4].ID = "MN4";
constituents[Constants.MN4].Description = "";
constituents[Constants.MN4].Speed = 57.4238337;
constituents[Constants.NU2].ID = "NU2";
constituents[Constants.NU2].Description = "";
constituents[Constants.NU2].Speed = 2.0 * Constants.T - 3.0 * Constants.s + 4.0 * Constants.h - Constants.p; // 28.5125831
constituents[Constants.S6].ID = "S6";
constituents[Constants.S6].Description = "";
constituents[Constants.S6].Speed = 90.0;
constituents[Constants.MU2].ID = "MU2";
constituents[Constants.MU2].Description = "";
constituents[Constants.MU2].Speed = 27.9682084;
constituents[Constants._2N2].ID = "2N2";
constituents[Constants._2N2].Description = "";
constituents[Constants._2N2].Speed = 27.8953548;
constituents[Constants.OO1].ID = "OO1";
constituents[Constants.OO1].Description = "";
constituents[Constants.OO1].Speed = 16.1391017;
constituents[Constants.LAMBDA2].ID = "LAMBDA2";
constituents[Constants.LAMBDA2].Description = "";
constituents[Constants.LAMBDA2].Speed = 29.4556253;
constituents[Constants.S1].ID = "S1";
constituents[Constants.S1].Description = "";
constituents[Constants.S1].Speed = 15.0;
constituents[Constants.M1].ID = "M1";
constituents[Constants.M1].Description = "";
constituents[Constants.M1].Speed = 14.4966939;
constituents[Constants.J1].ID = "J1";
constituents[Constants.J1].Description = "";
constituents[Constants.J1].Speed = 15.5854433;
constituents[Constants.MM].ID = "MM";
constituents[Constants.MM].Description = "precession of Moon's perigee with respect to Moon's phase?";
constituents[Constants.MM].Speed = Constants.s - Constants.p; // 0.5443747
constituents[Constants.SSA].ID = "SSA";
constituents[Constants.SSA].Description = "";
constituents[Constants.SSA].Speed = 0.0821373;
constituents[Constants.SA].ID = "SA";
constituents[Constants.SA].Description = "Earth's Perihelion";
constituents[Constants.SA].Speed = Constants.h; // 0.0410686
constituents[Constants.MSF].ID = "MSF";
constituents[Constants.MSF].Description = "";
constituents[Constants.MSF].Speed = 1.0158958;
constituents[Constants.MF].ID = "MF";
constituents[Constants.MF].Description = "";
constituents[Constants.MF].Speed = 1.0980331;
constituents[Constants.RHO1].ID = "RHO1";
constituents[Constants.RHO1].Description = "";
constituents[Constants.RHO1].Speed = 13.4715145;
constituents[Constants.Q1].ID = "Q1";
constituents[Constants.Q1].Description = "";
constituents[Constants.Q1].Speed = 13.3986609;
constituents[Constants.T2].ID = "T2";
constituents[Constants.T2].Description = "";
constituents[Constants.T2].Speed = 29.9589333;
constituents[Constants.R2].ID = "R2";
constituents[Constants.R2].Description = "";
constituents[Constants.R2].Speed = 30.0410667;
constituents[Constants._2Q1].ID = "2Q1";
constituents[Constants._2Q1].Description = "";
constituents[Constants._2Q1].Speed = 12.8542862;
constituents[Constants.P1].ID = "P1";
constituents[Constants.P1].Description = "Principal solar declination";
constituents[Constants.P1].Speed = Constants.T - Constants.h; // 14.9589314;
constituents[Constants._2SM2].ID = "2SM2";
constituents[Constants._2SM2].Description = "";
constituents[Constants._2SM2].Speed = 31.0158958;
constituents[Constants.M3].ID = "M3";
constituents[Constants.M3].Description = "";
constituents[Constants.M3].Speed = 43.4761563;
constituents[Constants.L2].ID = "L2";
constituents[Constants.L2].Description = "";
constituents[Constants.L2].Speed = 2.0 * Constants.T - Constants.s + 2.0 * Constants.h - Constants.p; // 29.5284789
constituents[Constants._2MK3].ID = "2MK3";
constituents[Constants._2MK3].Description = "";
constituents[Constants._2MK3].Speed = 42.9271398;
constituents[Constants.K2].ID = "K2";
constituents[Constants.K2].Description = "Combined Sun-Moon angle (1 cycle = 1/2 rotation of earth with respect to fixed stars)";
constituents[Constants.K2].Speed = 2.0 * Constants.T + 2.0 * Constants.h; // 30.0821373
constituents[Constants.M8].ID = "M8";
constituents[Constants.M8].Description = "";
constituents[Constants.M8].Speed = 115.9364169;
constituents[Constants.MS4].ID = "MS4";
constituents[Constants.MS4].Description = "";
constituents[Constants.MS4].Speed = 58.9841042;
return(constituents);
}