SP-345 Evolution of the Solar
System
FIGURE 8.51.- The orbit of Pluto with
respect to the Sun and to Neptune. The orbital pattern of Pluto
librates relative to Neptune, but for clarity the Plutonian orbit is
held stationary and the libration of Neptune relative to it is shown.
The equilibrium position of Neptune is at a and Neptune librates
between extreme positions at b and c with an amplitude of
38°. (From Cohen and Hubbard, 1965.)
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