The camera is in ecliptic orbit of the Earth here. If you look real close
you might see the Moon move through the camera view. The moon is actually
orbiting too, but at the proper rate of one lunar month (and not all of that
is modelled). This is  a conceptual example of an animation I first saw on
Compuserve years ago. The original artist's name is lost to me (sorry). This
128-frame animation took just over 10 minutes to render.
  The Earth appears to wobble, because it is tilted toward the Sun (northern
hemisphere's summer) and the camera is coplanar with the orbital path about
the Sun.

Grim

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