No, Kelly, the moon did not move visibly in those thirty seconds (it is the *real* moon, BTW, not a fake one pasted into the picture;-)) The huge wheel--called The London Eye or Millenium Wheel--does not turn anymore at that time of the day; too bad, because from the presumably tallest observation wheel worldwide's height of over 135 meters you have an incredible view all over London (though the cabins' windows are not exactly a photographer's delight...). Thank you for your kind remark! -- db.
Nice shot Dan. After 30 seconds, I'm surprised not to see more motion blur from the moon. It would have been cool to get an even longer exposure with the ferris wheel in motion. - Kelly