#define DEG_IN_RADIAN 57.2957795130823
#define HRS_IN_RADIAN 3.819718634205
// SMALL_ANGLE 1.e-8 radian = 1e-3 ArcSec
#define SMALL_ANGLE 1.e-8
#define SMALL_ANGLE_2 (SMALL_ANGLE*SMALL_ANGLE)

int PlGalCross(double TSid,double Lat,double zRot,double alpG,double decG
              ,double& azCr1,double& azCr2);
int EquatToHoriz(double alpha,double delta,double TSid,double latitude
                ,double& azimuth,double& elevation);
int FindPerpEquat(double a1,double d1,double a2,double d2,double& ap,double& dp);