The clock in the gym at my apartment complex is a SkyScan ®. The diagram on the clock face - in my case, analog - suggests a satellite. I think it's a marketing gimmick!
The actual clock is controlled from Fort Collins, Colorado by old-fashioned Marconi radio waves (Radio-Controlled Clock) from WWVB, a radio station operated by the National Institute of Standards and Technology.
This reality became obvious between grunts as the clock's minute hand started progressing forward - FAST, as it had been behind several hours/days and was trying to sync with the central control signal in Colorado. Still speeding clockwise as my wife and I left, it will progress until it matches the exact day/time. Nerdier, more detailed description here.
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