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Here is a link to a brief video of it in motion. http://www.youtube.com/watch?v=M4V7aMSo20c
There are three planes or rotation going at different rates with Quidditch players also orbiting each other on their own levels.
I love the Technic sets but I would like to see Lego come out with more sets that emphasize artistic use of the gear sets and automation.
Flow of Motion
The orrery here has 3 arenas of motion.
Prime Arm A rotates clockwise round Prime Axis (Yellow) with A3 on one end. Secondary axis on Prime Arm A rotates a secondary Arm so that A2 has an "erratic" orbit around A1. A2 orbits the secondary axis faster than A3 orbits its axis.
Prime Arm B rotates counter clockwise. Secondary Axis (which is mirrored) has a clockwise rotating Secondary Arm. B1 and B2 are equidistant from their axis so they appear to be spinning around each other WHILE spinning around the primary Axis.
There are two identical Prime Arms on the C level each terminating in C1. These arms turn clockwise. Two, non-rotating arms descend from Prime Arm B however terminating in C2. These elements Turn counter clockwise to the outer ring formed by the four C1s.
In the quidditch scenario depicted. The Snitch (A1) is being pursued by Harry (A2) while Malfoy (A3) occasionally gets close to the Snitch but never as well as Harry.
B1 is a Chaser and B2 is a Beater. They orbit the bludgers. In this depiction Gryffindor has the Quaffle.
The C1s are four Chasers with and the C2s are Beaters.
There is a rotating axle that comes out of the structure to power motion of the Keepers, but that is not depicted in this photo.