1. ^ The effect of oscillation on the shape of the orbit is analogous to the shape change of the rim of a ringing bell, neglecting the side-to-side displacement of the orbit's geometric center. The analogy fails to represent the entire orbital change, because while the gravitational center of the orbit remains nearly fixed on the Sun, its geometric center swings from side to side at the same rate as the eccentricity oscillation; a ringing bell's geometric center rem.
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