Rosa Henderson, of Greta Valley School, asks :-
Why don't the tides follow the moon and so get later the further west you go?
Dick Dowden, a physicist at Otago University, responded.
Well they do in general and would do without exception if the world were just a huge ball of water without land poking above the surface and getting in the way. Where the water is shallow, the high tide requires the water to come from elsewhere other than just below. Down here in Dunedin, most of the water in the harbour (which is quite shallow except in the dredged channels) flows out to the sea at low tide and so has to come back in again for high tide. This takes time so high tide at the city end is an hour or so later than at the harbour entrance or at the ocean beaches. So to check (which I haven't done) to see if the tides get later the further west you go, you would need to use tide times in the open sea on tiny islands or at least on the NZ coast, not at the inland end of estuaries.