public static AASLunarEclipseDetails CalculateLunar(double k)
{
#if DEBUG
double intp = 0;
bool bSolarEclipse = (AASMath.modF(k, ref intp) == 0);
if (bSolarEclipse)
{
throw new NotSupportedException("bSolarEclipse must be false for the operation to complete successfully.");
}
#endif
double Mdash = 0;
AASSolarEclipseDetails solarDetails = Calculate(k, ref Mdash);
//What will be the return value
AASLunarEclipseDetails details = new AASLunarEclipseDetails
{
bEclipse = solarDetails.Flags != 0,
F = solarDetails.F,
gamma = solarDetails.gamma,
TimeOfMaximumEclipse = solarDetails.TimeOfMaximumEclipse,
u = solarDetails.u
};
if (details.bEclipse)
{
details.PenumbralRadii = 1.2848 + details.u;
details.UmbralRadii = 0.7403 - details.u;
double fgamma = Math.Abs(details.gamma);
details.PenumbralMagnitude = (1.5573 + details.u - fgamma) / 0.5450;
details.UmbralMagnitude = (1.0128 - details.u - fgamma) / 0.5450;
double p = 1.0128 - details.u;
double t = 0.4678 - details.u;
double n = 0.5458 + 0.0400 * Math.Cos(Mdash);
double gamma2 = details.gamma * details.gamma;
double p2 = p * p;
if (p2 >= gamma2)
{
details.PartialPhaseSemiDuration = 60 / n * Math.Sqrt(p2 - gamma2);
}
double t2 = t * t;
if (t2 >= gamma2)
{
details.TotalPhaseSemiDuration = 60 / n * Math.Sqrt(t2 - gamma2);
}
double h = 1.5573 + details.u;
double h2 = h * h;
if (h2 >= gamma2)
{
details.PartialPhasePenumbraSemiDuration = 60 / n * Math.Sqrt(h2 - gamma2);
}
}
return(details);
}
public void Get(ref long Year, ref long Month, ref long Day, ref long Hour, ref long Minute, ref double Second)
{
double JD = _mDblJulian + 0.5;
double tempZ = 0;
double F = AASMath.modF(JD, ref tempZ);
long Z = (long)tempZ;
long A;
//There is a difference here between the Meeus implementation and this one
//if Z >= 2299161 The Meeus implementation automatically assumes the Gregorian Calendar
//came into effect on 15 October 1582 (JD: 2299161), while the CAADate
//implementation has a "m_bGregorianCalendar" value to decide if the date
//was specified in the Gregorian or Julian Calendars. This difference
//means in effect that CAADate fully supports a propalactive version of the
//Julian calendar. This allows you to construct Julian dates after the Papal
//reform in 1582. This is useful if you want to construct dates in countries
//which did not immediately adapt the Gregorian calendar
if (_mBGregorianCalendar)
{
long alpha = INT((Z - 1867216.25) / 36524.25);
A = Z + 1 + alpha - INT(INT(alpha) / 4.0);
}
else
{
A = Z;
}
long B = A + 1524;
long C = INT((B - 122.1) / 365.25);
long D = INT(365.25 * C);
long E = INT((B - D) / 30.6001);
double dblDay = B - D - INT(30.6001 * E) + F;
Day = (long)dblDay;
if (E < 14)
{
Month = E - 1;
}
else
{
Month = E - 13;
}
if (Month > 2)
{
Year = C - 4716;
}
else
{
Year = C - 4715;
}
F = AASMath.modF(dblDay, ref tempZ);
Hour = INT(F * 24);
Minute = INT((F - Hour / 24.0) * 1440.0);
Second = (F - Hour / 24.0 - Minute / 1440.0) * 86400.0;
}
public static AASSolarEclipseDetails CalculateSolar(double k)
{
#if DEBUG
double intp = 0;
bool bSolarEclipse = (AASMath.modF(k, ref intp) == 0);
if (!bSolarEclipse)
{
throw new NotSupportedException("bSolarEclipse must be true for the operation to complete successfully.");
}
#endif
double Mdash = 0;
return(Calculate(k, ref Mdash));
}
private static AASSolarEclipseDetails Calculate(double k, ref double Mdash)
{
//Are we looking for a solar or lunar eclipse
double intp = 0;
bool bSolarEclipse = (AASMath.modF(k, ref intp) == 0);
//What will be the return value
AASSolarEclipseDetails details = new AASSolarEclipseDetails();
//convert from K to T
double T = k / 1236.85;
double T2 = T * T;
double T3 = T2 * T;
double T4 = T3 * T;
double E = 1 - 0.002516 * T - 0.0000074 * T2;
double M = AASCoordinateTransformation.MapTo0To360Range(2.5534 + 29.10535670 * k - 0.0000014 * T2 - 0.00000011 * T3);
M = AASCoordinateTransformation.DegreesToRadians(M);
Mdash = AASCoordinateTransformation.MapTo0To360Range(201.5643 + 385.81693528 * k + 0.0107582 * T2 + 0.00001238 * T3 - 0.000000058 * T4);
Mdash = AASCoordinateTransformation.DegreesToRadians(Mdash);
double omega = AASCoordinateTransformation.MapTo0To360Range(124.7746 - 1.56375588 * k + 0.0020672 * T2 + 0.00000215 * T3);
omega = AASCoordinateTransformation.DegreesToRadians(omega);
double F = AASCoordinateTransformation.MapTo0To360Range(160.7108 + 390.67050284 * k - 0.0016118 * T2 - 0.00000227 * T3 + 0.00000001 * T4);
details.F = F;
double Fdash = F - 0.02665 * Math.Sin(omega);
F = AASCoordinateTransformation.DegreesToRadians(F);
Fdash = AASCoordinateTransformation.DegreesToRadians(Fdash);
//Do the first check to see if we have an eclipse
if (Math.Abs(Math.Sin(F)) > 0.36)
{
return(details);
}
double A1 = AASCoordinateTransformation.MapTo0To360Range(299.77 + 0.107408 * k - 0.009173 * T2);
A1 = AASCoordinateTransformation.DegreesToRadians(A1);
details.TimeOfMaximumEclipse = AASMoonPhases.MeanPhase(k);
double DeltaJD = 0;
if (bSolarEclipse)
{
DeltaJD += -0.4075 * Math.Sin(Mdash) +
0.1721 * E * Math.Sin(M);
}
else
{
DeltaJD += -0.4065 * Math.Sin(Mdash) +
0.1727 * E * Math.Sin(M);
}
DeltaJD += 0.0161 * Math.Sin(2 * Mdash) +
-0.0097 * Math.Sin(2 * Fdash) +
0.0073 * E * Math.Sin(Mdash - M) +
-0.0050 * E * Math.Sin(Mdash + M) +
-0.0023 * Math.Sin(Mdash - 2 * Fdash) +
0.0021 * E * Math.Sin(2 * M) +
0.0012 * Math.Sin(Mdash + 2 * Fdash) +
0.0006 * E * Math.Sin(2 * Mdash + M) +
-0.0004 * Math.Sin(3 * Mdash) +
-0.0003 * E * Math.Sin(M + 2 * Fdash) +
0.0003 * Math.Sin(A1) +
-0.0002 * E * Math.Sin(M - 2 * Fdash) +
-0.0002 * E * Math.Sin(2 * Mdash - M) +
-0.0002 * Math.Sin(omega);
details.TimeOfMaximumEclipse += DeltaJD;
double P = 0.2070 * E * Math.Sin(M) +
0.0024 * E * Math.Sin(2 * M) +
-0.0392 * Math.Sin(Mdash) +
0.0116 * Math.Sin(2 * Mdash) +
-0.0073 * E * Math.Sin(Mdash + M) +
0.0067 * E * Math.Sin(Mdash - M) +
0.0118 * Math.Sin(2 * Fdash);
double Q = 5.2207 +
-0.0048 * E * Math.Cos(M) +
0.0020 * E * Math.Cos(2 * M) +
-0.3299 * Math.Cos(Mdash) +
-0.0060 * E * Math.Cos(Mdash + M) +
0.0041 * E * Math.Cos(Mdash - M);
double W = Math.Abs(Math.Cos(Fdash));
details.gamma = (P * Math.Cos(Fdash) + Q * Math.Sin(Fdash)) * (1 - 0.0048 * W);
details.u = 0.0059 +
0.0046 * E * Math.Cos(M) +
-0.0182 * Math.Cos(Mdash) +
0.0004 * Math.Cos(2 * Mdash) +
-0.0005 * Math.Cos(M + Mdash);
//Check to see if the eclipse is visible from the Earth's surface
if (Math.Abs(details.gamma) > (1.5433 + details.u))
{
return(details);
}
//We have an eclipse at this time
details.bEclipse = true;
//In the case of a partial eclipse, calculate its magnitude
double fgamma = Math.Abs(details.gamma);
if (((fgamma > 0.9972) && (fgamma < 1.5433 + details.u)))
{
details.GreatestMagnitude = (1.5433 + details.u - fgamma) / (0.5461 + 2 * details.u);
}
return(details);
}
public static double TruePhase(double k)
{
//What will be the return value
double JD = MeanPhase(k);
//convert from K to T
double T = k / 1236.85;
double T2 = T * T;
double T3 = T2 * T;
double T4 = T3 * T;
double E = 1 - 0.002516 * T - 0.0000074 * T2;
double E2 = E * E;
double M = AASCoordinateTransformation.MapTo0To360Range(2.5534 + 29.10535670 * k - 0.0000014 * T2 - 0.00000011 * T3);
M = AASCoordinateTransformation.DegreesToRadians(M);
double Mdash = AASCoordinateTransformation.MapTo0To360Range(201.5643 + 385.81693528 * k + 0.0107582 * T2 + 0.00001238 * T3 - 0.000000058 * T4);
Mdash = AASCoordinateTransformation.DegreesToRadians(Mdash);
double F = AASCoordinateTransformation.MapTo0To360Range(160.7108 + 390.67050284 * k - 0.0016118 * T2 - 0.00000227 * T3 + 0.000000011 * T4);
F = AASCoordinateTransformation.DegreesToRadians(F);
double omega = AASCoordinateTransformation.MapTo0To360Range(124.7746 - 1.56375588 * k + 0.0020672 * T2 + 0.00000215 * T3);
omega = AASCoordinateTransformation.DegreesToRadians(omega);
double A1 = AASCoordinateTransformation.MapTo0To360Range(299.77 + 0.107408 * k - 0.009173 * T2);
A1 = AASCoordinateTransformation.DegreesToRadians(A1);
double A2 = AASCoordinateTransformation.MapTo0To360Range(251.88 + 0.016321 * k);
A2 = AASCoordinateTransformation.DegreesToRadians(A2);
double A3 = AASCoordinateTransformation.MapTo0To360Range(251.83 + 26.651886 * k);
A3 = AASCoordinateTransformation.DegreesToRadians(A3);
double A4 = AASCoordinateTransformation.MapTo0To360Range(349.42 + 36.412478 * k);
A4 = AASCoordinateTransformation.DegreesToRadians(A4);
double A5 = AASCoordinateTransformation.MapTo0To360Range(84.66 + 18.206239 * k);
A5 = AASCoordinateTransformation.DegreesToRadians(A5);
double A6 = AASCoordinateTransformation.MapTo0To360Range(141.74 + 53.303771 * k);
A6 = AASCoordinateTransformation.DegreesToRadians(A6);
double A7 = AASCoordinateTransformation.MapTo0To360Range(207.14 + 2.453732 * k);
A7 = AASCoordinateTransformation.DegreesToRadians(A7);
double A8 = AASCoordinateTransformation.MapTo0To360Range(154.84 + 7.306860 * k);
A8 = AASCoordinateTransformation.DegreesToRadians(A8);
double A9 = AASCoordinateTransformation.MapTo0To360Range(34.52 + 27.261239 * k);
A9 = AASCoordinateTransformation.DegreesToRadians(A9);
double A10 = AASCoordinateTransformation.MapTo0To360Range(207.19 + 0.121824 * k);
A10 = AASCoordinateTransformation.DegreesToRadians(A10);
double A11 = AASCoordinateTransformation.MapTo0To360Range(291.34 + 1.844379 * k);
A11 = AASCoordinateTransformation.DegreesToRadians(A11);
double A12 = AASCoordinateTransformation.MapTo0To360Range(161.72 + 24.198154 * k);
A12 = AASCoordinateTransformation.DegreesToRadians(A12);
double A13 = AASCoordinateTransformation.MapTo0To360Range(239.56 + 25.513099 * k);
A13 = AASCoordinateTransformation.DegreesToRadians(A13);
double A14 = AASCoordinateTransformation.MapTo0To360Range(331.55 + 3.592518 * k);
A14 = AASCoordinateTransformation.DegreesToRadians(A14);
//convert to radians
double kint = 0;
double kfrac = AASMath.modF(k, ref kint);
if (kfrac < 0)
{
kfrac = 1 + kfrac;
}
if (kfrac == 0) //New Moon
{
double DeltaJD = -0.40720 * Math.Sin(Mdash) +
0.17241 * E * Math.Sin(M) +
0.01608 * Math.Sin(2 * Mdash) +
0.01039 * Math.Sin(2 * F) +
0.00739 * E * Math.Sin(Mdash - M) +
-0.00514 * E * Math.Sin(Mdash + M) +
0.00208 * E2 * Math.Sin(2 * M) +
-0.00111 * Math.Sin(Mdash - 2 * F) +
-0.00057 * Math.Sin(Mdash + 2 * F) +
0.00056 * E * Math.Sin(2 * Mdash + M) +
-0.00042 * Math.Sin(3 * Mdash) +
0.00042 * E * Math.Sin(M + 2 * F) +
0.00038 * E * Math.Sin(M - 2 * F) +
-0.00024 * E * Math.Sin(2 * Mdash - M) +
-0.00017 * Math.Sin(omega) +
-0.00007 * Math.Sin(Mdash + 2 * M) +
0.00004 * Math.Sin(2 * Mdash - 2 * F) +
0.00004 * Math.Sin(3 * M) +
0.00003 * Math.Sin(Mdash + M - 2 * F) +
0.00003 * Math.Sin(2 * Mdash + 2 * F) +
-0.00003 * Math.Sin(Mdash + M + 2 * F) +
0.00003 * Math.Sin(Mdash - M + 2 * F) +
-0.00002 * Math.Sin(Mdash - M - 2 * F) +
-0.00002 * Math.Sin(3 * Mdash + M) +
0.00002 * Math.Sin(4 * Mdash);
JD += DeltaJD;
}
else if ((kfrac == 0.25) || (kfrac == 0.75)) //First Quarter or Last Quarter
{
double DeltaJD = -0.62801 * Math.Sin(Mdash) +
0.17172 * E * Math.Sin(M) +
-0.01183 * E * Math.Sin(Mdash + M) +
0.00862 * Math.Sin(2 * Mdash) +
0.00804 * Math.Sin(2 * F) +
0.00454 * E * Math.Sin(Mdash - M) +
0.00204 * E2 * Math.Sin(2 * M) +
-0.00180 * Math.Sin(Mdash - 2 * F) +
-0.00070 * Math.Sin(Mdash + 2 * F) +
-0.00040 * Math.Sin(3 * Mdash) +
-0.00034 * E * Math.Sin(2 * Mdash - M) +
0.00032 * E * Math.Sin(M + 2 * F) +
0.00032 * E * Math.Sin(M - 2 * F) +
-0.00028 * E2 * Math.Sin(Mdash + 2 * M) +
0.00027 * E * Math.Sin(2 * Mdash + M) +
-0.00017 * Math.Sin(omega) +
-0.00005 * Math.Sin(Mdash - M - 2 * F) +
0.00004 * Math.Sin(2 * Mdash + 2 * F) +
-0.00004 * Math.Sin(Mdash + M + 2 * F) +
0.00004 * Math.Sin(Mdash - 2 * M) +
0.00003 * Math.Sin(Mdash + M - 2 * F) +
0.00003 * Math.Sin(3 * M) +
0.00002 * Math.Sin(2 * Mdash - 2 * F) +
0.00002 * Math.Sin(Mdash - M + 2 * F) +
-0.00002 * Math.Sin(3 * Mdash + M);
JD += DeltaJD;
double W = 0.00306 - 0.00038 * E * Math.Cos(M) + 0.00026 * Math.Cos(Mdash) - 0.00002 * Math.Cos(Mdash - M) + 0.00002 * Math.Cos(Mdash + M) + 0.00002 * Math.Cos(2 * F);
if (kfrac == 0.25) //First quarter
{
JD += W;
}
else
{
JD -= W;
}
}
else if (kfrac == 0.5) //Full Moon
{
double DeltaJD = -0.40614 * Math.Sin(Mdash) +
0.17302 * E * Math.Sin(M) +
0.01614 * Math.Sin(2 * Mdash) +
0.01043 * Math.Sin(2 * F) +
0.00734 * E * Math.Sin(Mdash - M) +
-0.00514 * E * Math.Sin(Mdash + M) +
0.00209 * E2 * Math.Sin(2 * M) +
-0.00111 * Math.Sin(Mdash - 2 * F) +
-0.00057 * Math.Sin(Mdash + 2 * F) +
0.00056 * E * Math.Sin(2 * Mdash + M) +
-0.00042 * Math.Sin(3 * Mdash) +
0.00042 * E * Math.Sin(M + 2 * F) +
0.00038 * E * Math.Sin(M - 2 * F) +
-0.00024 * E * Math.Sin(2 * Mdash - M) +
-0.00017 * Math.Sin(omega) +
-0.00007 * Math.Sin(Mdash + 2 * M) +
0.00004 * Math.Sin(2 * Mdash - 2 * F) +
0.00004 * Math.Sin(3 * M) +
0.00003 * Math.Sin(Mdash + M - 2 * F) +
0.00003 * Math.Sin(2 * Mdash + 2 * F) +
-0.00003 * Math.Sin(Mdash + M + 2 * F) +
0.00003 * Math.Sin(Mdash - M + 2 * F) +
-0.00002 * Math.Sin(Mdash - M - 2 * F) +
-0.00002 * Math.Sin(3 * Mdash + M) +
0.00002 * Math.Sin(4 * Mdash);
JD += DeltaJD;
}
else
{
throw new NotSupportedException("The calculated lunar angular distance is invalid.");
}
//Additional corrections for all phases
double DeltaJD2 = 0.000325 * Math.Sin(A1) +
0.000165 * Math.Sin(A2) +
0.000164 * Math.Sin(A3) +
0.000126 * Math.Sin(A4) +
0.000110 * Math.Sin(A5) +
0.000062 * Math.Sin(A6) +
0.000060 * Math.Sin(A7) +
0.000056 * Math.Sin(A8) +
0.000047 * Math.Sin(A9) +
0.000042 * Math.Sin(A10) +
0.000040 * Math.Sin(A11) +
0.000037 * Math.Sin(A12) +
0.000035 * Math.Sin(A13) +
0.000023 * Math.Sin(A14);
JD += DeltaJD2;
return(JD);
}
