--- DarthVader/OrbitalInfo/src/OrientationInfo.cpp	2008/10/01 15:26:35	1.1
+++ DarthVader/OrbitalInfo/src/OrientationInfo.cpp	2014/03/28 20:47:15	1.4
@@ -3,6 +3,7 @@
 #include <TObject.h>
 #include <TString.h>
 #include <TMatrixD.h>
+#include <TVector3.h>
 
 #include <OrientationInfo.h>
 
@@ -34,37 +35,20 @@
 }
 
 TMatrixD OrientationInfo::ECItoGreenwich(TMatrixD Aij, UInt_t t){
-    //t=1154304000+86400*365;
     TMatrixD Gij(3,3);
-    Double_t omg = (7.292115e-5)*a; // Earth rotation velosity (Around polar axis);
-    //Double_t t1 = 0;
-    //if(t<=1158883200) t1 = 1127347200+229.2732;		     //absTime at 22/09/2005 + diference between Solar midnight and Greenwich sidereal midnight
-    //if(t>1158883200&&t<=1190419200) t1 = 1158883200+172.3415;//absTime at 22/09/2006 + diference between Solar midnight and Greenwich sidereal midnight
-    //if(t>=1190419200&&t<1222041600) t1 = 1190419200+115.39;  //absTime at 22/09/2007 + diference between Solar midnight and Greenwich sidereal midnight
-    //if(t>=1222041600) t1 = 1222041600 + 294.9361;	     //absTime at 22/09/2008 + diference between Solar midnight and Greenwich sidereal midnight
-    //UInt_t Nd = (t-t1)/86400;
-    //Int_t DifSuSt = Nd*236.55;
+    Double_t omg = (7.292115e-5)*a; 			// Earth rotation velosity (Around polar axis);
     Double_t d = (t-10957*86400-43200); 		     //Number of day, passing from 01/01/2000 12:00:00 to t;
     d = d/86400;
-    //d = t-da*86400+DifSuSt
-    //cout<<"t = "<<t<<"\n";
-    //cout<<"t - 2000y = "<<t-10957*86400-43200<<"\n";
-    //cout<<"d = "<<d<<"\n";
-    //Int_t tl = t%86400;    //!!!!!!!!!!!!!!!!!!!!!!!!
     Double_t T = d/36525;				     //Number of Julian centuries;
     
-    //Double_t tl = t-t1-Nd*86400-DifSuSt;
     Double_t Se = 6*3600+41*60+236.555367908*d+0.093104*pow(T,2)-(6.2e-6)*pow(T,3);
-    //cout<<"Se = "<<Se<<"\n";
-    //cout<<t<<endl<<d<<endl<<tl<<endl<<Se+omg*tl*86400/360<<endl;
+
     Int_t tr = (t-10957*86400)%86400;
-    //cout<<"tr = "<<tr<<endl;
+
     Double_t Somg = (Se+49.077+omg*86400*tr/360)*360/86400;
-    //cout<<"t1 = "<<(t-10957*86400)%86400<<"\n";
-    //cout<<"tr = "<<tr<<"\n";
-    //cout<<"Somg = "<<Se+omg*86400*tr/360<<"\n";
-    //cout<<"Somg = "<<((Somg-360*6)*86400/360/3600-20)*60<<"\n";
-    //cout<<cos(Somg/a)<<endl;
+
+    //Somg = 25; //for test transition
+
     Gij(0,0) = cos(Somg/a);
     Gij(0,1) = -sin(Somg/a);
     Gij(0,2) = 0;
@@ -75,88 +59,208 @@
     Gij(2,1) = 0;
     Gij(2,2) = 1;
     Gij.Invert();
-    //SetDirAxisGreenwich(Aij);
-    //cout<<(Somg/a)<<endl<<Aij(0,0)<<" "<<Aij(1,0)<<" "<<Aij(2,0)<<endl;
     return Gij*Aij;
 }
 
 TMatrixD OrientationInfo::GreenwichtoGEO(Double_t lat, Double_t lon, TMatrixD Aij){
-    //Double_t a = 360/(2*TMath::Pi());
-    //Double_t Re = 6000000;
+
     TMatrixD Gij(3,3);
     TMatrixD Fij(3,3);
-    
-    TMatrixD Hij(3,3); //TEST
-    TMatrixD Iij(3,3); //TEST
-    
-//    if((lat<0.1)&&(lat>-0.1)){
-	//cout<<"lon = "<<lon<<" lat = "<<lat<<endl;
-	lon=(-lon)/a; lat=(-lat)/a;
-	//cout<<"lon = "<<lon<<" lat = "<<lat<<endl;
-//    
-//        cout<<"Quaternions Array"<<endl;
-	//cout<<Aij(0,0)<<" "<<Aij(0,1)<<" "<<Aij(0,2)<<endl;
-        //cout<<Aij(1,0)<<" "<<Aij(1,1)<<" "<<Aij(1,2)<<endl;
-	//cout<<Aij(2,0)<<" "<<Aij(2,1)<<" "<<Aij(2,2)<<endl<<endl;
-//    }
-    //Double_t x0 = (alt+Re)*sin(lat)*sin(lon);
-    //Double_t y0 = (alt+Re)*sin(lat)*cos(lon);
-    //Double_t Sa = lon-a*atan(y0/x0);
-    //if (y0>0&&x0<0) Sa=-Sa+90;
-    //if (y0<0&&x0<0) Sa=Sa-90;
-    //if (y0>0&&x0==0) Sa=90;
-    //if (y0<0&&x0==0) Sa=-90;
 
-    Gij(0,0) = cos(lon);
+    lon=(-lon)/a; lat=(-lat)/a;   // here has the same result as Gij.Invert() in ECItoGreenwich function
+
+    Gij(0,0) = cos(lon);	// rotation around z-axis:
     Gij(0,1) = -sin(lon);
-    Gij(0,2) = 0;
-    Gij(1,0) = sin(lon);
-    Gij(1,1) = cos(lon);
+    Gij(0,2) = 0;		//	| cos(lon) 	-sin(lon)	0|
+    Gij(1,0) = sin(lon);	//	| sin(lon) 	cos(lon)	0|
+    Gij(1,1) = cos(lon);	//	|   0			0	1|
     Gij(1,2) = 0;
     Gij(2,0) = 0;
     Gij(2,1) = 0;
     Gij(2,2) = 1;
-
-    //cout<<"First rotation"<<endl;
-    //cout<<Gij(0,0)<<" "<<Gij(0,1)<<" "<<Gij(0,2)<<endl;
-    //cout<<Gij(1,0)<<" "<<Gij(1,1)<<" "<<Gij(1,2)<<endl;
-    //cout<<Gij(2,0)<<" "<<Gij(2,1)<<" "<<Gij(2,2)<<endl<<endl;
     
-    //Gij.Invert();
-    
-    Fij(0,0) = cos(lat);
-    Fij(0,1) = 0;
-    Fij(0,2) = -sin(lat);
-    Fij(1,0) = 0;
-    Fij(1,1) = 1;
+    Fij(0,0) = cos(lat);	// rotation around y-axis at angle -lat, cause rotation around y from x to z axis is negative
+    Fij(0,1) = 0;		//
+    Fij(0,2) = -sin(lat);	//	|cos(-lat)	0	sin(-lat)|		|cos(lat)	0	-sin(lat)|
+    Fij(1,0) = 0;		//	|	0	1		0 |	==>	|	0	1		0 |
+    Fij(1,1) = 1;		//	|-sin(-lat)	0	cos(-lat)|		|sin(lat)	0	cos(lat) |
     Fij(1,2) = 0;
     Fij(2,0) = sin(lat);
     Fij(2,1) = 0;
     Fij(2,2) = cos(lat);
-    
-    //Fij.Invert();
-    
-    //if((lat<0.1)&&(lat>-0.1)){
-    /*    Hij=Gij*Aij;  //TEST
-    
-        cout<<"First rotation"<<endl;
-        cout<<Hij(0,0)<<" "<<Hij(0,1)<<" "<<Hij(0,2)<<endl;
-        cout<<Hij(1,0)<<" "<<Hij(1,1)<<" "<<Hij(1,2)<<endl;
-        cout<<Hij(2,0)<<" "<<Hij(2,1)<<" "<<Hij(2,2)<<endl<<endl;
-    
-        Iij = Fij*(Gij*Aij); //TEST
-    
-        cout<<"Second rotation"<<endl;
-	cout<<Iij(0,0)<<" "<<Iij(0,1)<<" "<<Iij(0,2)<<endl;
-        cout<<Iij(1,0)<<" "<<Iij(1,1)<<" "<<Iij(1,2)<<endl;
-	cout<<Iij(2,0)<<" "<<Iij(2,1)<<" "<<Iij(2,2)<<endl;
-//    
-        Int_t ret;
-	cin>>ret;*/
-//    }
+
     return Fij*(Gij*Aij);
 }
 
+TMatrixD OrientationInfo::EulertoEci(Double_t x0, Double_t y0, Double_t z0, Double_t Vx0, Double_t Vy0, Double_t Vz0, Double_t Bank, Double_t Yaw, Double_t SPitch){
+//cerr.precision(12);
+//cerr<<"Position:\t"<<x0<<"\t"<<y0<<"\t"<<z0<<"\tVelocity:\t"<<Vx0<<"\t"<<Vy0<<"\t"<<Vz0<<endl;
+    //Sangur to Resurs transition
+    TMatrixD Zij(3,3);
+    Zij(0,0) = 0.0; Zij(0,1) = 0.0; Zij(0,2) = -1.0;
+    Zij(1,0) = -1.0; Zij(1,1) = 0.0; Zij(1,2) = 0.0;
+    Zij(2,0) = 0.0; Zij(2,1) = 1.0; Zij(2,2) = 0.0;
+
+    //Spacecraft velosity referenca frame in Eci
+    TMatrixD Aij(3,3);
+    Double_t C1 = y0*Vz0 - z0*Vy0;
+    Double_t C2 = z0*Vx0 - x0*Vz0;
+    Double_t C3 = x0*Vy0 - y0*Vx0;
+    Double_t C  = sqrt(C1*C1 + C2*C2 + C3*C3);
+    Double_t V0 = sqrt(Vx0*Vx0+Vy0*Vy0 + Vz0*Vz0);
+    Aij(0,0) = Vx0/V0;	Aij(0,1) = C1/C;	Aij(0,2) = (Vy0*C3-Vz0*C2)/(V0*C);
+    Aij(1,0) = Vy0/V0;	Aij(1,1) = C2/C;	Aij(1,2) = (Vz0*C1-Vx0*C3)/(V0*C);
+    Aij(2,0) = Vz0/V0;	Aij(2,1) = C3/C;	Aij(2,2) = (Vx0*C2-Vy0*C1)/(V0*C);
+
+    //Elements of matrix elements described orientation of spacecraft on velocity reference frame
+     Double_t u10 = tan(Bank*TMath::DegToRad())/sqrt(tan(Bank*TMath::DegToRad())*tan(Bank*TMath::DegToRad())+1);
+     Double_t u11 = -sqrt((1-u10*u10))/(1+tan(Yaw*TMath::DegToRad())*tan(Yaw*TMath::DegToRad()));
+     Double_t u12 = u11*tan(Yaw*TMath::DegToRad());
+     Double_t u20 = -sqrt((1-u10*u10)/(1+tan(SPitch*TMath::DegToRad())*tan(SPitch*TMath::DegToRad())));
+     Double_t u00 = -u20*tan(SPitch*TMath::DegToRad());
+
+     Double_t ab = 1+(u20*u20/(u00*u00));
+     Double_t by = 2*u10*u11*u20/(u00*u00);
+     Double_t cy = (1+u10*u10/(u00*u00))*u11*u11-1;
+     Double_t bz = 2*u10*u12*u20/(u00*u00);
+     Double_t cz = (1+u10*u10/(u00*u00))*u12*u12-1;
+
+    Int_t uj = TMath::Sign(1.,Yaw)*TMath::Sign(1.,SPitch);
+     //long double by_l = by;
+     Double_t Ds = by*by-4*ab*cy;
+     if(Ds<0) Ds = 0.;
+     Double_t u21 = (-by+uj*sqrt(Ds))/(2*ab);
+     Double_t u21s = -TMath::Sign(1.,Bank)*TMath::Abs(u21);
+     Double_t u01 = TMath::Sign(1.,Yaw)*TMath::Abs((u10*u11+u20*u21)/u00);
+//    cerr<<"by = " << by<<"\tuj"<<uj<<"\tab: "<<ab<<"\t"<<by*by-4*ab*cy<<endl;
+//    cerr<<"u21: "<<u21<<"\tu01: "<<u01<<"\t"<<TMath::Abs((u10*u11+u20*u21)/u00)<<"\t"<<TMath::Sign(1.,Yaw)<<"\t"<<(u10*u11+u20*u21)<<endl;
+    Int_t fj=1;
+    if(TMath::Sign(1.,SPitch)>0 && TMath::Sign(1.,Yaw)>0) fj=-1;
+//    cout<<"bla-bla-bla"<<endl;
+
+     Double_t u22 = (-bz+fj*sqrt(bz*bz-4*ab*cz))/(2*ab);
+     Double_t u22s = -TMath::Sign(1.,SPitch)*TMath::Abs(u22);
+     Double_t u02 = -TMath::Abs((u10*u12+u20*u22)/u00);
+
+//    cout<<fj<<"\t"<<ab<<"\t"<<by<<"\t"<<cy<<"\t"<<bz<<"\t"<<cz<<endl;
+//    cout<<"INSIDE EULERTOECI"<<endl;
+//    cout<<u00<<"\t"<<u01<<"\t"<<u02<<endl;
+//    cout<<u10<<"\t"<<u11<<"\t"<<u12<<endl;
+//    cout<<u20<<"\t"<<u21s<<"\t"<<u22s<<endl;
+
+    TMatrixD Dij(3,3);
+    Dij(0,0) = u00;  Dij(0,1) = u01;  Dij(0,2) = u02;
+    Dij(1,0) = u10;  Dij(1,1) = u11;  Dij(1,2) = u12;
+    Dij(2,0) = u20;  Dij(2,1) = u21s;  Dij(2,2) = u22s;
+
+    TMatrixD Shij(3,3);
+    TMatrixD Usij(3,3);
+    Usij = (Aij*Dij);
+    Usij.Invert();
+    Shij = Zij*Usij;
+    Shij.Invert();
+
+    return Shij;
+}
+
+TMatrixD OrientationInfo::ECItoGEO(TMatrixD Aij, UInt_t t, Double_t lat, Double_t lon){
+    TMatrixD Gij(3,3);
+    Double_t omg = (7.292115e-5)*a; 			// Earth rotation velosity (Around polar axis);
+    Double_t d = (t-10957*86400-43200); 		     //Number of day, passing from 01/01/2000 12:00:00 to t;
+    d = d/86400;
+    Double_t T = d/36525;				     //Number of Julian centuries;
+    
+    Double_t Se = 6*3600+41*60+236.555367908*d+0.093104*pow(T,2)-(6.2e-6)*pow(T,3);
+
+    Int_t tr = (t-10957*86400)%86400;
+
+    Double_t Somg = (Se+49.077+omg*86400*tr/360)*360/86400;
+
+    lon=(-lon)/a; lat=(-lat)/a;
+
+    Gij(0,0)=cos(lat)*cos(lon)*cos(Somg/a)+cos(lat)*sin(lon)*sin(Somg/a);
+    Gij(0,1)=cos(lat)*cos(lon)*sin(Somg/a)-cos(lat)*sin(lon)*cos(Somg/a);
+    Gij(0,2)=-sin(lat);
+    Gij(1,0)=sin(lon)*cos(Somg/a)-cos(lon)*sin(Somg/a);
+    Gij(1,1)=sin(lon)*sin(Somg/a)+cos(lon)*cos(Somg/a);
+    Gij(1,2)=0;
+    Gij(2,0)=sin(lat)*cos(lon)*cos(Somg/a)+sin(lat)*sin(lon)*sin(Somg/a);
+    Gij(2,1)=sin(lat)*cos(lon)*sin(Somg/a)-sin(lat)*sin(lon)*cos(Somg/a);
+    Gij(2,2)=cos(lat);
+
+    TMatrixD Tij=Gij*Aij;
+
+    return Tij;
+}
+
+TMatrixD OrientationInfo::GEOtoECI(TMatrixD Aij, UInt_t t, Double_t lat, Double_t lon){
+   TMatrixD Gij(3,3);
+   Double_t omg = (7.292115e-5)*a; 				// Earth rotation velosity (Around polar axis);
+   Double_t d = (t-10957*86400-43200); 		     		//Number of day, passing from 01/01/2000 12:00:00 to t;
+   d = d/86400;
+   Double_t T = d/36525;				     	//Number of Julian centuries;
+    
+   Double_t Se = 6*3600+41*60+236.555367908*d+0.093104*pow(T,2)-(6.2e-6)*pow(T,3);
+
+   Int_t tr = (t-10957*86400)%86400;
+
+   Double_t Somg = (Se+49.077+omg*86400*tr/360)*360/86400;
+
+   lon=(-lon)/a; lat=(-lat)/a;
+
+   Gij(0,0)=cos(lat)*cos(lon)*cos(Somg/a)+cos(lat)*sin(lon)*sin(Somg/a);
+   Gij(1,0)=cos(lat)*cos(lon)*sin(Somg/a)-cos(lat)*sin(lon)*cos(Somg/a);
+   Gij(2,0)=-sin(lat);
+   Gij(0,1)=sin(lon)*cos(Somg/a)-cos(lon)*sin(Somg/a);
+   Gij(1,1)=sin(lon)*sin(Somg/a)+cos(lon)*cos(Somg/a);
+   Gij(2,1)=0;
+   Gij(0,2)=sin(lat)*cos(lon)*cos(Somg/a)+sin(lat)*sin(lon)*sin(Somg/a);
+   Gij(1,2)=sin(lat)*cos(lon)*sin(Somg/a)-sin(lat)*sin(lon)*cos(Somg/a);
+   Gij(2,2)=cos(lat);
+
+   return Gij*Aij;
+}
+
+
+TMatrixD OrientationInfo::GEOtoGeomag(TMatrixD Aij,Double_t Bnorth, Double_t Beast, Double_t Bup){	//Geomagnetic geodetic reference frame
+	Double_t alpha = 0;
+	if(Beast==0. && Bnorth>0) alpha = 0; else
+	if(Beast==0. && Bnorth<0) alpha = 180.; else{
+		if(Beast > 0) alpha = TMath::ATan(Bnorth/Beast)*TMath::RadToDeg() - 90.;
+		if(Beast < 0) alpha = TMath::ATan(Bnorth/Beast)*TMath::RadToDeg() + 90.;
+	}
+	alpha = alpha*TMath::DegToRad();
+	Double_t beta = TMath::ATan(Bup/sqrt(pow(Bnorth,2)+pow(Beast,2)));
+	//if(Bup<0.0) beta = TMath::ATan(TMath::Abs(Bup/sqrt(pow(Bnorth,2)+pow(Beast,2))));
+	//if(Bup>0.0) beta = TMath::ATan(TMath::Abs(sqrt(pow(Bnorth,2)+pow(Beast,2))/Bup));
+	//cout<<"GEOtomag:alpha = "<<alpha*TMath::RadToDeg()<<"\tbeta = "<<beta*TMath::RadToDeg()<<endl;
+	TMatrixD Gij(3,3);
+    	TMatrixD Fij(3,3);
+	Gij(0,0) = 1;			//rotation around x-axis at angle alpha
+	Gij(0,1) = 0;
+	Gij(0,2) = 0;			//	|1		0		0	|
+	Gij(1,0) = 0;			//	|0	cos(alpha)	-sin(alpha)	|
+	Gij(1,1) = cos(alpha);	//	|0	sin(alpha)	cos(alpha)	|
+	Gij(1,2) = -sin(alpha);
+	Gij(2,0) = 0;
+	Gij(2,1) = sin(alpha);
+	Gij(2,2) = cos(alpha);
+	Gij.Invert();
+	Fij(0,0) = cos(beta);	//rotation around y-axis at angle beta
+	Fij(0,1) = 0;
+    	Fij(0,2) = sin(beta);	//	|cos(beta)	0	sin(beta)|
+    	Fij(1,0) = 0;			//	|	0	1		0 |
+    	Fij(1,1) = 1;			//	|-sin(beta)	0	cos(beta)|
+    	Fij(1,2) = 0;
+    	Fij(2,0) = -sin(beta);
+    	Fij(2,1) = 0;
+    	Fij(2,2) = cos(beta);
+	Fij.Invert();
+	//Int_t tri;
+	//cin >> tri;
+	return Fij*(Gij*Aij);
+}
+
 TMatrixD OrientationInfo::PamelatoGEO(TMatrixD Aij, Double_t B1, Double_t B2, Double_t B3){
     //TMatrixD Gij(3,3);
     TMatrixD Hij(3,1);
@@ -164,23 +268,8 @@
     Bij(0,0) = B1;
     Bij(1,0) = B2;
     Bij(2,0) = B3;
-    //Double_t alfa = TMath::ASin(sqrt(1/((Aij(1,2))/Aij(0,2)+1))) * TMath::RadToDeg();
-    //Gij(0,0) = cos(alfa/a);   		
-    //Gij(0,1) = -sin(alfa/a);  		
-    //Gij(0,2) = 0;	  			
-    //Gij(1,0) = 0;	  			
-    //Gij(1,1) = 1;	  			
-    //Gij(1,2) = 0;	  			
-    //Gij(2,0) = sin(alfa/a);  			
-    //Gij(2,1) = cos(alfa/a);  			
-    //Gij(2,2) = 0;				
-    
     Hij=Aij*Bij;
     return Hij;
-    //cout<<0.25-Aij(2,2)/(Aij(2,1)*Aij(2,0))<<endl;
-    //cout<<Hij(0,0)<<endl;//" "<<Hij(0,1)<<" "<<Hij(0,2)<<endl;
-    //cout<<Hij(1,0)<<endl;//" "<<Hij(1,1)<<" "<<Hij(1,2)<<endl;
-    //cout<<Hij(2,0)<<endl;//" "<<Hij(2,1)<<" "<<Hij(2,2)<<endl;
 }
 
 TMatrixD OrientationInfo::ColPermutation(TMatrixD Aij){
@@ -191,6 +280,76 @@
     return Aij*Gij;
 }
 
+TVector3 OrientationInfo::GetSunPosition(UInt_t atime){
+  TVector3 sunout;
+  Float_t JD=atime/86400.+2440587.5;
+//SAV
+//  cout << "JD = " << JD <<endl;
+//SAV
+ //test June 1997 JD=2451545.0-877.047;
+  Float_t Tm = (JD - 2451545.0)/36525.;
+  Float_t Mo = (357.52910+35999.05030*Tm-0.0001559*Tm*Tm-0.00000048*Tm*Tm*Tm);
+//SAV
+//  cout<<"Tm = " << Tm << "Mo = " << Mo <<endl;
+//SAV
+  Mo=Mo*TMath::DegToRad();
+ 
+  Float_t Co = ((1.914600 - 0.004817*Tm - 0.00014*Tm*Tm)*sin(Mo) + (0.019993 - 0.000101*Tm)* sin(2.*Mo) + 0.000290* sin(3.*Mo));
+  Co=Co* TMath::DegToRad();
+  
+  Float_t Lo = (280.46645 + 36000.76983*Tm +0.0003032*Tm*Tm);
+  Lo=Lo*TMath::DegToRad();
+  
+  Float_t theta = (Lo + Co); // * TMath::DegToRad();
+   
+  Float_t eps = (23.+26./60.+21.448/3600. - 46.8150/3600.*Tm - 0.00059/3600.*Tm*Tm + 0.001813*Tm*Tm*Tm)*TMath::DegToRad();
+
+//SAV
+//  cout << "Co = " << Co*TMath::RadToDeg() << "\tLo = " << Lo*TMath::RadToDeg() << "\ttheta = " << theta << "\teps = " << eps << endl;
+//SAV
+
+  Float_t YY=cos(eps)*sin(theta);
+  Float_t XX=cos(theta);
+//SAV
+//  cout << "XX = " << XX << "\tYY" << YY << endl;
+//SAV
+  Float_t RASun=atan(YY/XX);
+  if(XX<0. ) RASun=RASun+TMath::Pi();
+  if(XX >0. && YY <0.) RASun=RASun+2*TMath::Pi();
+  Float_t DESun = asin(sin(eps)*sin(theta));
+//SAV
+//  cout << "DE = " << DESun << "\t" << RASun << endl;
+//SAV
+  sunout.SetMagThetaPhi(1.0,TMath::Pi()/2.-DESun,RASun);
+  return sunout;
+}
+
+Float_t OrientationInfo::Larmor(Float_t Ek,Float_t Bm,Int_t iZ,Float_t xA){  //Ek in MeV, Bm in nT, Pitch-angle, rad
+  Float_t mp = 938.272029;//	Float_t amu = 931.494043e0;
+    Float_t cc = 299792458.;
+    Float_t ee = 1.60217653e-19;
+    Float_t kg = 1.7826619e-30;
+    Float_t gam = (Ek+mp)/mp;
+    Float_t mm = mp*kg;
+    Float_t omega = iZ*ee*Bm*1e-9/(gam*mm);
+    Float_t larmor = 1e-3*sqrt(1e0-1e0/pow(gam,2))*cc/omega;
+    larmor = 1e-3*Ek*cc/omega; //Ek here is p or for onecharged particle R; larmor in m
+    return larmor;
+}
+
+TMatrixD OrientationInfo::GetDirectiontoGirocenter(Float_t R, Float_t Px, Float_t Py){
+    TMatrixD GirDir(3,1);
+    if(R>0){
+	GirDir(0,0) = Py;
+	GirDir(1,0) = -Px;
+    }else{
+	GirDir(0,0) = -Py;
+	GirDir(1,0) = Px;
+    }
+    GirDir(2,0) = 0.;
+    return GirDir;
+}
+
 Double_t OrientationInfo::GetPitchAngle(Double_t x1, Double_t y1, Double_t z1, Double_t x2, Double_t y2, Double_t z2){
     return TMath::ACos((x1*x2 + y1*y2 + z1*z2)/(sqrt(pow(x1,2)+pow(y1,2)+pow(z1,2))*sqrt(pow(x2,2)+pow(y2,2)+pow(z2,2)))) * TMath::RadToDeg();
 }