public static double SpringEquinox(long Year) { //calculate the approximate date double JDE; if (Year <= 1000) { double Y = Year / 1000.0; double Ysquared = Y * Y; double Ycubed = Ysquared * Y; double Y4 = Ycubed * Y; JDE = 1721139.29189 + 365242.13740 * Y + 0.06134 * Ysquared + 0.00111 * Ycubed - 0.00071 * Y4; } else { double Y = (Year - 2000) / 1000.0; double Ysquared = Y * Y; double Ycubed = Ysquared * Y; double Y4 = Ycubed * Y; JDE = 2451623.80984 + 365242.37404 * Y + 0.05169 * Ysquared - 0.00411 * Ycubed - 0.00057 * Y4; } double Correction; do { double SunLongitude = AASSun.ApparentEclipticLongitude(JDE); Correction = 58 * Math.Sin(AASCoordinateTransformation.DegreesToRadians(-SunLongitude)); JDE += Correction; }while (Math.Abs(Correction) > 0.00001); //Corresponds to an error of 0.86 of a second return(JDE); }
public static AASSelenographicMoonDetails CalculateSelenographicPositionOfSun(double JD, bool bHighPrecision) { double R = AASEarth.RadiusVector(JD, bHighPrecision) * 149597970; double Delta = AASMoon.RadiusVector(JD); double lambda0 = AASSun.ApparentEclipticLongitude(JD, bHighPrecision); double lambda = AASMoon.EclipticLongitude(JD); double beta = AASMoon.EclipticLatitude(JD); double lambdah = AASCoordinateTransformation.MapTo0To360Range(lambda0 + 180 + Delta / R * 57.296 * Math.Cos(AASCoordinateTransformation.DegreesToRadians(beta)) * Math.Sin(AASCoordinateTransformation.DegreesToRadians(lambda0 - lambda))); double betah = Delta / R * beta; //What will be the return value AASSelenographicMoonDetails details = new AASSelenographicMoonDetails(); //Calculate the optical libration double omega = 0; double DeltaU = 0; double sigma = 0; double I = 0; double rho = 0; double ldash0 = 0; double bdash0 = 0; double ldash20 = 0; double bdash20 = 0; double epsilon = 0; CalculateOpticalLibration(JD, lambdah, betah, ref ldash0, ref bdash0, ref ldash20, ref bdash20, ref epsilon, ref omega, ref DeltaU, ref sigma, ref I, ref rho); details.l0 = ldash0 + ldash20; details.b0 = bdash0 + bdash20; details.c0 = AASCoordinateTransformation.MapTo0To360Range(450 - details.l0); return(details); }
public static double AutumnEquinox(long Year) { //calculate the approximate date double JDE; if (Year <= 1000) { double Y = Year / 1000.0; double Ysquared = Y * Y; double Ycubed = Ysquared * Y; double Y4 = Ycubed * Y; JDE = 1721325.70455 + 365242.49558 * Y - 0.11677 * Ysquared - 0.00297 * Ycubed + 0.00074 * Y4; } else { double Y = (Year - 2000) / 1000.0; double Ysquared = Y * Y; double Ycubed = Ysquared * Y; double Y4 = Ycubed * Y; JDE = 2451810.21715 + 365242.01767 * Y - 0.11575 * Ysquared + 0.00337 * Ycubed + 0.00078 * Y4; } double Correction; do { double SunLongitude = AASSun.ApparentEclipticLongitude(JDE); Correction = 58 * Math.Sin(AASCoordinateTransformation.DegreesToRadians(180 - SunLongitude)); JDE += Correction; }while (Math.Abs(Correction) > 0.00001); //Corresponds to an error of 0.86 of a second return(JDE); }
public static double SummerSolstice(long Year) { //calculate the approximate date double JDE; if (Year <= 1000) { double Y = Year / 1000.0; double Ysquared = Y * Y; double Ycubed = Ysquared * Y; double Y4 = Ycubed * Y; JDE = 1721233.25401 + 365241.72562 * Y - 0.05323 * Ysquared + 0.00907 * Ycubed + 0.00025 * Y4; } else { double Y = (Year - 2000) / 1000.0; double Ysquared = Y * Y; double Ycubed = Ysquared * Y; double Y4 = Ycubed * Y; JDE = 2451716.56767 + 365241.62603 * Y + 0.00325 * Ysquared + 0.00888 * Ycubed - 0.00030 * Y4; } double Correction; do { double SunLongitude = AASSun.ApparentEclipticLongitude(JDE); Correction = 58 * Math.Sin(AASCoordinateTransformation.DegreesToRadians(90 - SunLongitude)); JDE += Correction; }while (Math.Abs(Correction) > 0.00001); //Corresponds to an error of 0.86 of a second return(JDE); }
public static double WinterSolstice(long Year) { //calculate the approximate date double JDE; if (Year <= 1000) { double Y = Year / 1000.0; double Ysquared = Y * Y; double Ycubed = Ysquared * Y; double Y4 = Ycubed * Y; JDE = 1721414.39987 + 365242.88257 * Y - 0.00769 * Ysquared - 0.00933 * Ycubed - 0.00006 * Y4; } else { double Y = (Year - 2000) / 1000.0; double Ysquared = Y * Y; double Ycubed = Ysquared * Y; double Y4 = Ycubed * Y; JDE = 2451900.05952 + 365242.74049 * Y - 0.06223 * Ysquared - 0.00823 * Ycubed + 0.00032 * Y4; } double Correction; do { double SunLongitude = AASSun.ApparentEclipticLongitude(JDE); Correction = 58 * Math.Sin(AASCoordinateTransformation.DegreesToRadians(270 - SunLongitude)); JDE += Correction; }while (Math.Abs(Correction) > 0.00001); //Corresponds to an error of 0.86 of a second return(JDE); }
public static double Calculate(double JD) { double rho = (JD - 2451545) / 365250; double rhosquared = rho * rho; double rhocubed = rhosquared * rho; double rho4 = rhocubed * rho; double rho5 = rho4 * rho; //Calculate the Suns mean longitude double L0 = AASCoordinateTransformation.MapTo0To360Range(280.4664567 + 360007.6982779 * rho + 0.03032028 * rhosquared + rhocubed / 49931 - rho4 / 15300 - rho5 / 2000000); //Calculate the Suns apparent right ascension double SunLong = AASSun.ApparentEclipticLongitude(JD); double SunLat = AASSun.ApparentEclipticLatitude(JD); double epsilon = AASNutation.TrueObliquityOfEcliptic(JD); AAS2DCoordinate Equatorial = AASCoordinateTransformation.Ecliptic2Equatorial(SunLong, SunLat, epsilon); epsilon = AASCoordinateTransformation.DegreesToRadians(epsilon); double E = L0 - 0.0057183 - Equatorial.X * 15 + AASCoordinateTransformation.DMSToDegrees(0, 0, AASNutation.NutationInLongitude(JD)) * Math.Cos(epsilon); if (E > 180) { E = -(360 - E); } E *= 4; //Convert to minutes of time return(E); }
public static AAS2DCoordinate EclipticAberration(double Lambda, double Beta, double JD) { //What is the return value AAS2DCoordinate aberration = new AAS2DCoordinate(); double T = (JD - 2451545) / 36525; double Tsquared = T * T; double e = 0.016708634 - 0.000042037 * T - 0.0000001267 * Tsquared; double pi = 102.93735 + 1.71946 * T + 0.00046 * Tsquared; const double k = 20.49552; double SunLongitude = AASSun.GeometricEclipticLongitude(JD); //Convert to radians pi = AASCoordinateTransformation.DegreesToRadians(pi); Lambda = AASCoordinateTransformation.DegreesToRadians(Lambda); Beta = AASCoordinateTransformation.DegreesToRadians(Beta); SunLongitude = AASCoordinateTransformation.DegreesToRadians(SunLongitude); aberration.X = (-k * Math.Cos(SunLongitude - Lambda) + e * k * Math.Cos(pi - Lambda)) / Math.Cos(Beta) / 3600; aberration.Y = -k *Math.Sin(Beta) * (Math.Sin(SunLongitude - Lambda) - e * Math.Sin(pi - Lambda)) / 3600; return(aberration); }
public static CAAPhysicalMarsDetails Calculate(double JD, bool bHighPrecision) { //What will be the return value CAAPhysicalMarsDetails details = new CAAPhysicalMarsDetails(); //Step 1 double T = (JD - 2451545) / 36525; double Lambda0 = 352.9065 + 1.17330 * T; double Lambda0rad = AASCoordinateTransformation.DegreesToRadians(Lambda0); double Beta0 = 63.2818 - 0.00394 * T; double Beta0rad = AASCoordinateTransformation.DegreesToRadians(Beta0); //Step 2 double l0 = AASEarth.EclipticLongitude(JD, bHighPrecision); double l0rad = AASCoordinateTransformation.DegreesToRadians(l0); double b0 = AASEarth.EclipticLatitude(JD, bHighPrecision); double b0rad = AASCoordinateTransformation.DegreesToRadians(b0); double R = AASEarth.RadiusVector(JD, bHighPrecision); double PreviousLightTravelTime = 0; double LightTravelTime = 0; double x = 0; double y = 0; double z = 0; bool bIterate = true; double DELTA = 0; double l = 0; double lrad = 0; double b = 0; double r = 0; while (bIterate) { double JD2 = JD - LightTravelTime; //Step 3 l = AASMars.EclipticLongitude(JD2, bHighPrecision); lrad = AASCoordinateTransformation.DegreesToRadians(l); b = AASMars.EclipticLatitude(JD2, bHighPrecision); double brad = AASCoordinateTransformation.DegreesToRadians(b); r = AASMars.RadiusVector(JD2, bHighPrecision); //Step 4 x = r * Math.Cos(brad) * Math.Cos(lrad) - R * Math.Cos(l0rad); y = r * Math.Cos(brad) * Math.Sin(lrad) - R * Math.Sin(l0rad); z = r * Math.Sin(brad) - R * Math.Sin(b0rad); DELTA = Math.Sqrt(x * x + y * y + z * z); LightTravelTime = AASElliptical.DistanceToLightTime(DELTA); //Prepare for the next loop around bIterate = (Math.Abs(LightTravelTime - PreviousLightTravelTime) > 2E-6); //2E-6 correponds to 0.17 of a second if (bIterate) { PreviousLightTravelTime = LightTravelTime; } } //Step 5 double lambdarad = Math.Atan2(y, x); double lambda = AASCoordinateTransformation.RadiansToDegrees(lambdarad); double betarad = Math.Atan2(z, Math.Sqrt(x * x + y * y)); double beta = AASCoordinateTransformation.RadiansToDegrees(betarad); //Step 6 details.DE = AASCoordinateTransformation.RadiansToDegrees(Math.Asin(-Math.Sin(Beta0rad) * Math.Sin(betarad) - Math.Cos(Beta0rad) * Math.Cos(betarad) * Math.Cos(Lambda0rad - lambdarad))); //Step 7 double N = 49.5581 + 0.7721 * T; double Nrad = AASCoordinateTransformation.DegreesToRadians(N); double ldash = l - 0.00697 / r; double ldashrad = AASCoordinateTransformation.DegreesToRadians(ldash); double bdash = b - 0.000225 * (Math.Cos(lrad - Nrad) / r); double bdashrad = AASCoordinateTransformation.DegreesToRadians(bdash); //Step 8 details.DS = AASCoordinateTransformation.RadiansToDegrees(Math.Asin(-Math.Sin(Beta0rad) * Math.Sin(bdashrad) - Math.Cos(Beta0rad) * Math.Cos(bdashrad) * Math.Cos(Lambda0rad - ldashrad))); //Step 9 double W = AASCoordinateTransformation.MapTo0To360Range(11.504 + 350.89200025 * (JD - LightTravelTime - 2433282.5)); //Step 10 double e0 = AASNutation.MeanObliquityOfEcliptic(JD); double e0rad = AASCoordinateTransformation.DegreesToRadians(e0); AAS2DCoordinate PoleEquatorial = AASCoordinateTransformation.Ecliptic2Equatorial(Lambda0, Beta0, e0); double alpha0rad = AASCoordinateTransformation.HoursToRadians(PoleEquatorial.X); double delta0rad = AASCoordinateTransformation.DegreesToRadians(PoleEquatorial.Y); //Step 11 double u = y * Math.Cos(e0rad) - z * Math.Sin(e0rad); double v = y * Math.Sin(e0rad) + z * Math.Cos(e0rad); double alpharad = Math.Atan2(u, x); double alpha = AASCoordinateTransformation.RadiansToHours(alpharad); double deltarad = Math.Atan2(v, Math.Sqrt(x * x + u * u)); double delta = AASCoordinateTransformation.RadiansToDegrees(deltarad); double xi = Math.Atan2(Math.Sin(delta0rad) * Math.Cos(deltarad) * Math.Cos(alpha0rad - alpharad) - Math.Sin(deltarad) * Math.Cos(delta0rad), Math.Cos(deltarad) * Math.Sin(alpha0rad - alpharad)); //Step 12 details.w = AASCoordinateTransformation.MapTo0To360Range(W - AASCoordinateTransformation.RadiansToDegrees(xi)); //Step 13 double NutationInLongitude = AASNutation.NutationInLongitude(JD); double NutationInObliquity = AASNutation.NutationInObliquity(JD); //Step 14 lambda += 0.005693 * Math.Cos(l0rad - lambdarad) / Math.Cos(betarad); beta += 0.005693 * Math.Sin(l0rad - lambdarad) * Math.Sin(betarad); //Step 15 Lambda0 += NutationInLongitude / 3600; lambda += NutationInLongitude / 3600; e0 += NutationInObliquity / 3600; //Step 16 AAS2DCoordinate ApparentPoleEquatorial = AASCoordinateTransformation.Ecliptic2Equatorial(Lambda0, Beta0, e0); double alpha0dash = AASCoordinateTransformation.HoursToRadians(ApparentPoleEquatorial.X); double delta0dash = AASCoordinateTransformation.DegreesToRadians(ApparentPoleEquatorial.Y); AAS2DCoordinate ApparentMars = AASCoordinateTransformation.Ecliptic2Equatorial(lambda, beta, e0); double alphadash = AASCoordinateTransformation.HoursToRadians(ApparentMars.X); double deltadash = AASCoordinateTransformation.DegreesToRadians(ApparentMars.Y); //Step 17 details.P = AASCoordinateTransformation.MapTo0To360Range(AASCoordinateTransformation.RadiansToDegrees(Math.Atan2(Math.Cos(delta0dash) * Math.Sin(alpha0dash - alphadash), Math.Sin(delta0dash) * Math.Cos(deltadash) - Math.Cos(delta0dash) * Math.Sin(deltadash) * Math.Cos(alpha0dash - alphadash)))); //Step 18 double SunLambda = AASSun.GeometricEclipticLongitude(JD, bHighPrecision); double SunBeta = AASSun.GeometricEclipticLatitude(JD, bHighPrecision); AAS2DCoordinate SunEquatorial = AASCoordinateTransformation.Ecliptic2Equatorial(SunLambda, SunBeta, e0); details.X = AASMoonIlluminatedFraction.PositionAngle(SunEquatorial.X, SunEquatorial.Y, alpha, delta); //Step 19 details.d = 9.36 / DELTA; details.k = AASIlluminatedFraction.IlluminatedFraction(r, R, DELTA); details.q = (1 - details.k) * details.d; return(details); }
public static AASNearParabolicObjectDetails Calculate(double JD, ref AASNearParabolicObjectElements elements, bool bHighPrecision) { double Epsilon = AASNutation.MeanObliquityOfEcliptic(elements.JDEquinox); double JD0 = JD; //What will be the return value AASNearParabolicObjectDetails details = new AASNearParabolicObjectDetails(); Epsilon = AASCoordinateTransformation.DegreesToRadians(Epsilon); double omega = AASCoordinateTransformation.DegreesToRadians(elements.omega); double w = AASCoordinateTransformation.DegreesToRadians(elements.w); double i = AASCoordinateTransformation.DegreesToRadians(elements.i); double sinEpsilon = Math.Sin(Epsilon); double cosEpsilon = Math.Cos(Epsilon); double sinOmega = Math.Sin(omega); double cosOmega = Math.Cos(omega); double cosi = Math.Cos(i); double sini = Math.Sin(i); double F = cosOmega; double G = sinOmega * cosEpsilon; double H = sinOmega * sinEpsilon; double P = -sinOmega * cosi; double Q = cosOmega * cosi * cosEpsilon - sini * sinEpsilon; double R = cosOmega * cosi * sinEpsilon + sini * cosEpsilon; double a = Math.Sqrt(F * F + P * P); double b = Math.Sqrt(G * G + Q * Q); double c = Math.Sqrt(H * H + R * R); double A = Math.Atan2(F, P); double B = Math.Atan2(G, Q); double C = Math.Atan2(H, R); AAS3DCoordinate SunCoord = AASSun.EquatorialRectangularCoordinatesAnyEquinox(JD, elements.JDEquinox, bHighPrecision); for (int j = 0; j < 2; j++) { double v = 0; double r = 0; CalulateTrueAnnomalyAndRadius(JD0, ref elements, ref v, ref r); double x = r * a * Math.Sin(A + w + v); double y = r * b * Math.Sin(B + w + v); double z = r * c * Math.Sin(C + w + v); if (j == 0) { details.HeliocentricRectangularEquatorial.X = x; details.HeliocentricRectangularEquatorial.Y = y; details.HeliocentricRectangularEquatorial.Z = z; //Calculate the heliocentric ecliptic coordinates also double u = w + v; double cosu = Math.Cos(u); double sinu = Math.Sin(u); details.HeliocentricRectangularEcliptical.X = r * (cosOmega * cosu - sinOmega * sinu * cosi); details.HeliocentricRectangularEcliptical.Y = r * (sinOmega * cosu + cosOmega * sinu * cosi); details.HeliocentricRectangularEcliptical.Z = r * sini * sinu; details.HeliocentricEclipticLongitude = AASCoordinateTransformation.MapTo0To360Range(AASCoordinateTransformation.RadiansToDegrees(Math.Atan2(details.HeliocentricRectangularEcliptical.Y, details.HeliocentricRectangularEcliptical.X))); details.HeliocentricEclipticLatitude = AASCoordinateTransformation.RadiansToDegrees(Math.Asin(details.HeliocentricRectangularEcliptical.Z / r)); } double psi = SunCoord.X + x; double nu = SunCoord.Y + y; double sigma = SunCoord.Z + z; double Alpha = Math.Atan2(nu, psi); Alpha = AASCoordinateTransformation.RadiansToDegrees(Alpha); double Delta = Math.Atan2(sigma, Math.Sqrt(psi * psi + nu * nu)); Delta = AASCoordinateTransformation.RadiansToDegrees(Delta); double Distance = Math.Sqrt(psi * psi + nu * nu + sigma * sigma); if (j == 0) { details.TrueGeocentricRA = AASCoordinateTransformation.MapTo0To24Range(Alpha / 15); details.TrueGeocentricDeclination = Delta; details.TrueGeocentricDistance = Distance; details.TrueGeocentricLightTime = AASElliptical.DistanceToLightTime(Distance); } else { details.AstrometricGeocentricRA = AASCoordinateTransformation.MapTo0To24Range(Alpha / 15); details.AstrometricGeocentricDeclination = Delta; details.AstrometricGeocentricDistance = Distance; details.AstrometricGeocentricLightTime = AASElliptical.DistanceToLightTime(Distance); double RES = Math.Sqrt(SunCoord.X * SunCoord.X + SunCoord.Y * SunCoord.Y + SunCoord.Z * SunCoord.Z); details.Elongation = AASCoordinateTransformation.RadiansToDegrees(Math.Acos((RES * RES + Distance * Distance - r * r) / (2 * RES * Distance))); details.PhaseAngle = AASCoordinateTransformation.RadiansToDegrees(Math.Acos((r * r + Distance * Distance - RES * RES) / (2 * r * Distance))); } if (j == 0) //Prepare for the next loop around { JD0 = JD - details.TrueGeocentricLightTime; } } return(details); }
public static AASGalileanMoonsDetails Calculate(double JD, bool bHighPrecision) { //Calculate the position of the Sun double sunlong = AASSun.GeometricEclipticLongitude(JD, bHighPrecision); double sunlongrad = AASCoordinateTransformation.DegreesToRadians(sunlong); double beta = AASSun.GeometricEclipticLatitude(JD, bHighPrecision); double betarad = AASCoordinateTransformation.DegreesToRadians(beta); double R = AASEarth.RadiusVector(JD, bHighPrecision); //Calculate the the light travel time from Jupiter to the Earth double DELTA = 5; double PreviousEarthLightTravelTime = 0; double EarthLightTravelTime = AASElliptical.DistanceToLightTime(DELTA); double JD1 = JD - EarthLightTravelTime; bool bIterate = true; double x; double y; double z; double l; double lrad; double b; double brad; double r; while (bIterate) { //Calculate the position of Jupiter l = AASJupiter.EclipticLongitude(JD1, bHighPrecision); lrad = AASCoordinateTransformation.DegreesToRadians(l); b = AASJupiter.EclipticLatitude(JD1, bHighPrecision); brad = AASCoordinateTransformation.DegreesToRadians(b); r = AASJupiter.RadiusVector(JD1, bHighPrecision); x = r * Math.Cos(brad) * Math.Cos(lrad) + R * Math.Cos(sunlongrad); y = r * Math.Cos(brad) * Math.Sin(lrad) + R * Math.Sin(sunlongrad); z = r * Math.Sin(brad) + R * Math.Sin(betarad); DELTA = Math.Sqrt(x * x + y * y + z * z); EarthLightTravelTime = AASElliptical.DistanceToLightTime(DELTA); //Prepare for the next loop around bIterate = (Math.Abs(EarthLightTravelTime - PreviousEarthLightTravelTime) > 2e-6); //2e-6 corresponds to 0.17 of a second if (bIterate) { JD1 = JD - EarthLightTravelTime; PreviousEarthLightTravelTime = EarthLightTravelTime; } } //Calculate the details as seen from the earth AASGalileanMoonsDetails details1 = CalculateHelper(JD, sunlongrad, betarad, R, bHighPrecision); AASGalileanMoonDetail details1Satellite1 = details1.Satellite1; AASGalileanMoonDetail details1Satellite2 = details1.Satellite2; AASGalileanMoonDetail details1Satellite3 = details1.Satellite3; AASGalileanMoonDetail details1Satellite4 = details1.Satellite4; FillInPhenomenaDetails(ref details1Satellite1); FillInPhenomenaDetails(ref details1Satellite2); FillInPhenomenaDetails(ref details1Satellite3); FillInPhenomenaDetails(ref details1Satellite4); //Calculate the the light travel time from Jupiter to the Sun JD1 = JD - EarthLightTravelTime; l = AASJupiter.EclipticLongitude(JD1, bHighPrecision); lrad = AASCoordinateTransformation.DegreesToRadians(l); b = AASJupiter.EclipticLatitude(JD1, bHighPrecision); brad = AASCoordinateTransformation.DegreesToRadians(b); r = AASJupiter.RadiusVector(JD1, bHighPrecision); x = r * Math.Cos(brad) * Math.Cos(lrad); y = r * Math.Cos(brad) * Math.Sin(lrad); z = r * Math.Sin(brad); DELTA = Math.Sqrt(x * x + y * y + z * z); double SunLightTravelTime = AASElliptical.DistanceToLightTime(DELTA); //Calculate the details as seen from the Sun AASGalileanMoonsDetails details2 = CalculateHelper(JD + SunLightTravelTime - EarthLightTravelTime, sunlongrad, betarad, 0, bHighPrecision); AASGalileanMoonDetail details2Satellite1 = details2.Satellite1; AASGalileanMoonDetail details2Satellite2 = details2.Satellite2; AASGalileanMoonDetail details2Satellite3 = details2.Satellite3; AASGalileanMoonDetail details2Satellite4 = details2.Satellite4; FillInPhenomenaDetails(ref details2Satellite1); FillInPhenomenaDetails(ref details2Satellite2); FillInPhenomenaDetails(ref details2Satellite3); FillInPhenomenaDetails(ref details2Satellite4); //Finally transfer the required values from details2 to details1 details1.Satellite1.bInEclipse = details2.Satellite1.bInOccultation; details1.Satellite2.bInEclipse = details2.Satellite2.bInOccultation; details1.Satellite3.bInEclipse = details2.Satellite3.bInOccultation; details1.Satellite4.bInEclipse = details2.Satellite4.bInOccultation; details1.Satellite1.bInShadowTransit = details2.Satellite1.bInTransit; details1.Satellite2.bInShadowTransit = details2.Satellite2.bInTransit; details1.Satellite3.bInShadowTransit = details2.Satellite3.bInTransit; details1.Satellite4.bInShadowTransit = details2.Satellite4.bInTransit; return(details1); }
public static AASEllipticalPlanetaryDetails Calculate(double JD, AASEllipticalObject ellipticalObject, bool bHighPrecision) { //What will the the return value AASEllipticalPlanetaryDetails details = new AASEllipticalPlanetaryDetails(); //Calculate the position of the earth first double JD0 = JD; double L0 = AASEarth.EclipticLongitude(JD0, bHighPrecision); double B0 = AASEarth.EclipticLatitude(JD0, bHighPrecision); double R0 = AASEarth.RadiusVector(JD0, bHighPrecision); L0 = AASCoordinateTransformation.DegreesToRadians(L0); B0 = AASCoordinateTransformation.DegreesToRadians(B0); double cosB0 = Math.Cos(B0); //Iterate to find the positions adjusting for light-time correction if required double L = 0; double B = 0; double R = 0; if (ellipticalObject != AASEllipticalObject.SUN) { bool bRecalc = true; bool bFirstRecalc = true; double LPrevious = 0; double BPrevious = 0; double RPrevious = 0; while (bRecalc) { switch (ellipticalObject) { case AASEllipticalObject.SUN: L = AASSun.GeometricEclipticLongitude(JD0, bHighPrecision); B = AASSun.GeometricEclipticLatitude(JD0, bHighPrecision); R = AASEarth.RadiusVector(JD0, bHighPrecision); break; case AASEllipticalObject.MERCURY: L = AASMercury.EclipticLongitude(JD0, bHighPrecision); B = AASMercury.EclipticLatitude(JD0, bHighPrecision); R = AASMercury.RadiusVector(JD0, bHighPrecision); break; case AASEllipticalObject.VENUS: L = AASVenus.EclipticLongitude(JD0, bHighPrecision); B = AASVenus.EclipticLatitude(JD0, bHighPrecision); R = AASVenus.RadiusVector(JD0, bHighPrecision); break; case AASEllipticalObject.MARS: L = AASMars.EclipticLongitude(JD0, bHighPrecision); B = AASMars.EclipticLatitude(JD0, bHighPrecision); R = AASMars.RadiusVector(JD0, bHighPrecision); break; case AASEllipticalObject.JUPITER: L = AASJupiter.EclipticLongitude(JD0, bHighPrecision); B = AASJupiter.EclipticLatitude(JD0, bHighPrecision); R = AASJupiter.RadiusVector(JD0, bHighPrecision); break; case AASEllipticalObject.SATURN: L = AASSaturn.EclipticLongitude(JD0, bHighPrecision); B = AASSaturn.EclipticLatitude(JD0, bHighPrecision); R = AASSaturn.RadiusVector(JD0, bHighPrecision); break; case AASEllipticalObject.URANUS: L = AASUranus.EclipticLongitude(JD0, bHighPrecision); B = AASUranus.EclipticLatitude(JD0, bHighPrecision); R = AASUranus.RadiusVector(JD0, bHighPrecision); break; case AASEllipticalObject.NEPTUNE: L = AASNeptune.EclipticLongitude(JD0, bHighPrecision); B = AASNeptune.EclipticLatitude(JD0, bHighPrecision); R = AASNeptune.RadiusVector(JD0, bHighPrecision); break; case AASEllipticalObject.PLUTO: L = AASPluto.EclipticLongitude(JD0); B = AASPluto.EclipticLatitude(JD0); R = AASPluto.RadiusVector(JD0); break; default: break; } if (!bFirstRecalc) { bRecalc = ((Math.Abs(L - LPrevious) > 0.00001) || (Math.Abs(B - BPrevious) > 0.00001) || (Math.Abs(R - RPrevious) > 0.000001)); LPrevious = L; BPrevious = B; RPrevious = R; } else { bFirstRecalc = false; } //Calculate the new value if (bRecalc) { double Lrad = AASCoordinateTransformation.DegreesToRadians(L); double Brad = AASCoordinateTransformation.DegreesToRadians(B); double cosB = Math.Cos(Brad); double cosL = Math.Cos(Lrad); double x1 = R * cosB * cosL - R0 * cosB0 * Math.Cos(L0); double y1 = R * cosB * Math.Sin(Lrad) - R0 * cosB0 * Math.Sin(L0); double z1 = R * Math.Sin(Brad) - R0 * Math.Sin(B0); double distance = Math.Sqrt(x1 * x1 + y1 * y1 + z1 * z1); //Prepare for the next loop around JD0 = JD - AASElliptical.DistanceToLightTime(distance); } } } double x = 0; double y = 0; double z = 0; if (ellipticalObject != AASEllipticalObject.SUN) { double Lrad = AASCoordinateTransformation.DegreesToRadians(L); double Brad = AASCoordinateTransformation.DegreesToRadians(B); double cosB = Math.Cos(Brad); double cosL = Math.Cos(Lrad); x = R * cosB * cosL - R0 * cosB0 * Math.Cos(L0); y = R * cosB * Math.Sin(Lrad) - R0 * cosB0 * Math.Sin(L0); z = R * Math.Sin(Brad) - R0 * Math.Sin(B0); } else { x = -R0 *cosB0 *Math.Cos(L0); y = -R0 *cosB0 *Math.Sin(L0); z = -R0 *Math.Sin(B0); } double x2 = x * x; double y2 = y * y; details.ApparentGeocentricLatitude = AASCoordinateTransformation.RadiansToDegrees(Math.Atan2(z, Math.Sqrt(x2 + y2))); details.ApparentGeocentricDistance = Math.Sqrt(x2 + y2 + z * z); details.ApparentGeocentricLongitude = AASCoordinateTransformation.MapTo0To360Range(AASCoordinateTransformation.RadiansToDegrees(Math.Atan2(y, x))); details.ApparentLightTime = AASElliptical.DistanceToLightTime(details.ApparentGeocentricDistance); //Adjust for Aberration AAS2DCoordinate Aberration = AASAberration.EclipticAberration(details.ApparentGeocentricLongitude, details.ApparentGeocentricLatitude, JD, bHighPrecision); details.ApparentGeocentricLongitude += Aberration.X; details.ApparentGeocentricLatitude += Aberration.Y; //convert to the FK5 system double DeltaLong = AASFK5.CorrectionInLongitude(details.ApparentGeocentricLongitude, details.ApparentGeocentricLatitude, JD); details.ApparentGeocentricLatitude += AASFK5.CorrectionInLatitude(details.ApparentGeocentricLongitude, JD); details.ApparentGeocentricLongitude += DeltaLong; //Correct for nutation double NutationInLongitude = AASNutation.NutationInLongitude(JD); double Epsilon = AASNutation.TrueObliquityOfEcliptic(JD); details.ApparentGeocentricLongitude += AASCoordinateTransformation.DMSToDegrees(0, 0, NutationInLongitude); //Convert to RA and Dec AAS2DCoordinate ApparentEqu = AASCoordinateTransformation.Ecliptic2Equatorial(details.ApparentGeocentricLongitude, details.ApparentGeocentricLatitude, Epsilon); details.ApparentGeocentricRA = ApparentEqu.X; details.ApparentGeocentricDeclination = ApparentEqu.Y; return(details); }