When I tried to your movie(s), I received the error-msg shown below.
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-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@www.phys-l.org] On Behalf Of John Denker
Sent: Tuesday, August 11, 2015 9:56 PM
To: Forum for Physics Educators
Subject: [Phys-L] earth orbiting around the moon, or not
Hi Folks --
I made a little movie. It is based on the following premise:
Each month, the moon goes around in its orbit. Specifically,
it orbits around the center-of-mass of the earth/moon system.
The same goes for the earth: As you might expect based on
the third law of motion, the earth also orbits around the
center-of-mass of the earth-moon system.
Here's a two-minute movie that shows how that works: