static Vector<double> sunJ2kPosition(const CommonTime& time,TimeSystemEnum sys) { return sunJ2kPosition(ConvertTimeSystem(time,sys,TS_TT));}
Vector<double> IERS::sunECEFPosition(const CommonTime& TT) { return J2kPosToECEF( GPST2UTC(TT), sunJ2kPosition(TT) ); }