... Abstract This routine computes the Jacobian matrix of the transformation from rectangular to planetographic coordinates. ... Given a state in rectangular coordinates ( x, y, z, dx, dy, dz ) the velocity in planetographic coordinates is given by the matrix equation: t | ... The definition of this kernel variable controls the behavior of the CSPICE planetographic routines pgrrec_c recpgr_c dpgrdr_c drdpgr_c It does not affect the other CSPICE coordinate conversion routines. ... Link to routine source ...