Andoyer construction for Hill and Delaunay variables
  Andoyer variables are well known for the study of rotational dynamics. These variables were derived by Andoyer through a procedure that can be also used to obtain the Hill variables of the Kepler problem. Andoyer construction can also forecast the Delaunay variables which canonicity is then obtained without the use of a generating function. 
Jacques Laskar
astro-ph.IM math.DS