On 24/3/20 10:08 pm, Jim Wilkins wrote:
"Clifford Heath" wrote in message
...
On 23/3/20 5:43 pm, Richard Smith wrote:
(the Pacific has, in the main, just one tide per
day??).

No. Everywhere on earth, there are (almost) two tides per day,
because the high tides circulate (roughly following the moon) on
*opposite* sides of the globe.

It's like two dancers spinning around each other - both are flung
outwards away from the centre.

On average, the moon contributes about 1 metre of tidal flow, and
the sun about 0.5 metres. When these line up, you get 1.5m, and when
they're at right angles, you get 0.5m.

Up to here, all this can be calculated from the gravitational
equation, with knowledge of the orbits, masses and distances of the
earth, moon and sun.

Places with very high tides are like the slosh in the corner of a
square bucket - they're at "corners" of the oceans.

Clifford Heath.

You are both right, depending on where you look.
https://www.britannica.com/place/Pacific-Ocean/Tides

The diurnal tides are coastal, also caused by coastal slosh.

The ocean tides follow the pattern I described. There are many finer
details in tide modelling too; about 10 different oscillatory periods in
the models used by oceanographers. But to a first approximation,
moon-1m and sun-0.5m, plus slosh, gets you very close.

I live on the Pacific coast, swim in it often, and always check the tide
chart. Mixed tides, here.

CH