Evolution of the obliquity and the angle ﹩\psi +{\rm{\Omega }}﹩ for points a (left), b (middle), and c (right) from Figure 11. Point a approaches Cassini state 2 wherein the obliquity oscillation is smaller than the surrounding regions. Point b is librating about Cassini state 2 with a large amplitude, and its obliquity oscillation is large. Point c is near Cassini state 4.