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I have sort of a problem: I have a routine to calculate the geometric place ( the state vector ) of the bodies in our solar system ( from Paul Heafner - you probably know it ). But the problem is that the results are referred to the J2000 epoch frame. I was trying to convert the vector [x,y,z,vx,vy,vz ] from the J2000 epoch to the TDB (UT is also fine) choosen epoch, correcting the values for precession and nutation, getting [ x',y',z',vx',vy',vz' ]; and then, convert the result vector to the ecliptic plane, obtaining a new vector [ x",y",z",vx",vy",vz" ]. Does someone knows the routines to make this calculation? Or, at least, this final conversion?

Please answer as soon as possible - this is very urgent.

Kind regards,

Kepler

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# Converting a State Vector

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