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Trevor has emphasised inter-linked resonant amphidromic oscillations and de-bunked the Newtonian model of two bulges. So it seems to me one problem is why do the periods of these sloshing bowls all average out to produce two high tides a day virtually all over the world?

AND I feel I am being led into confusing the measurement of the phenomenon (ie the identification of the various sub-oscillations) with their cause - an oscillation needs some force to create it in the first place.

I also would assume that, as these oscillations appear not to be decaying (any historical records to prove this?), then the creating force still exists. There appears to be no doubt that we are looking at a netting of the influences of sun, moon, gravity, centripetal and centrifugal forces (is there a centrifugal force? I was taught that it was a confusion for the previous-named force) but so far I at least have not been attending closely enough to the various themes to identify a grand unification of the forum's consensus as to why and how....

Personal note: As a reader in a desert kingdom, I must say I love all this stuff...thanks to all who have the urge to understand and explain....

Keith Williams