private static void FillInPhenomenaDetails(ref AASGalileanMoonDetail detail)
{
double Y1 = 1.071374 * detail.ApparentRectangularCoordinates.Y;
double r = Y1 * Y1 + detail.ApparentRectangularCoordinates.X * detail.ApparentRectangularCoordinates.X;
if (r < 1)
{
if (detail.ApparentRectangularCoordinates.Z < 0)
{
//Satellite nearer to Earth than Jupiter, so it must be a transit not an occultation
detail.bInTransit = true;
detail.bInOccultation = false;
}
else
{
detail.bInTransit = false;
detail.bInOccultation = true;
}
}
else
{
detail.bInTransit = false;
detail.bInOccultation = false;
}
}
public AASGalileanMoonsDetails()
{
Satellite1 = new AASGalileanMoonDetail();
Satellite2 = new AASGalileanMoonDetail();
Satellite3 = new AASGalileanMoonDetail();
Satellite4 = new AASGalileanMoonDetail();
}
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);
}
private static void FillInPhenomenaDetails(ref AASGalileanMoonDetail detail)
{
double Y1 = 1.071374 * detail.ApparentRectangularCoordinates.Y;
double r = Y1 * Y1 + detail.ApparentRectangularCoordinates.X * detail.ApparentRectangularCoordinates.X;
if (r < 1)
{
if (detail.ApparentRectangularCoordinates.Z < 0)
{
//Satellite nearer to Earth than Jupiter, so it must be a transit not an occultation
detail.bInTransit = true;
detail.bInOccultation = false;
}
else
{
detail.bInTransit = false;
detail.bInOccultation = true;
}
}
else
{
detail.bInTransit = false;
detail.bInOccultation = false;
}
}
