Conversion of position & velocity in Cartesian coordinates to spherical coordinates. (double precision)
v double[6] Cartesian position & velocity vector
*a double longitude (radians) *b double latitude (radians) *r double radial coordinate *ad double longitude derivative (radians per unit time) *bd double latitude derivative (radians per unit time) *rd double radial derivative P.T.Wallace Starlink 31 October 1993