Incredibly, the ENSO model is able to detect the Draconic and Anomalistic lunar month values to within ~30 seconds out of ~27 days.

http://contextEarth.com/2017/05/01/the-enso-model-turns-into-a-metrology-tool/

The huge lever arm of a 130+ year ENSO record helps enormously to be able to resolve the value that precisely. Any other values would cause destructive interference over that interval.