Physically coupled pendulums will sync up (adjust their period to match).
But, physically uncoupled (fully independent) pendulums with differing periods will occasionally appear to take a swing or two in sync.
Polyrhythm is the relevant topic.
> all these services are individually down a lot, and the downtimes were bound to sync up
But the topic for that is the poisson distribution.
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Physically coupled pendulums will sync up (adjust their period to match).
But, physically uncoupled (fully independent) pendulums with differing periods will occasionally appear to take a swing or two in sync.