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$\begingroup$ Nitpick: Doesn't that first image show that the center of mass of the solar system takes a complicated trajectory, relative to the reference frame of the sun? As opposed to it showing that the center of the sun takes a complicated trajectory (relative to what reference frame I don't know). $\endgroup$
– zibadawa timmy
Commented Jun 6, 2015 at 9:27
$\begingroup$ @zibadawatimmy Yes, you are correct - I didn't look closely enough at it. Obviously it has the same consequence. $\endgroup$
– ProfRob
Commented Jun 6, 2015 at 10:16

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