Abstract
The theory of changes in the length of day produced by the long period zonal tides is examined in an attempt to resolve the discrepancy between theoretical and observational results. It is argued here that as a result of the lack of coupling between core and mantle each conserves angular momentum separately with the result that only the changes in mantle moment of inertia influence the changes in rotation rate. The difference between theory and observation is reduced to 2 per cent, well within the error bars of observation. The zonal response coefficient is κ= 0.315.
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