> So as far as predictive power, we rely on the stationary aspects of the QBO (2.33 year average period) and of the Chandler wobble (6.5 year beat period). These each show slight jitter about the mean frequency, but they also show stationarity in terms of exhibiting coherence over long time scales -- in other words if you advance the QBO by many multiples of a 2.33 year period, you will know where you are on the waveform (minus the jitter).

So after 91 years everything repeats?