Gregory's Server
The Globus advances its position every second. That's the annoying clicking sound, solenoids ratcheting the gears forward. For the landing position, a separate motor (upper right) spins the globe, stopping when an arm hits the limit switch. The relay board controls the motor.
Inside the Globus, ten differential gear assemblies add together rotations to determine the globe's position. Cams compute the nonlinear latitude and longitude functions.