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tides occur every 12 hrs 25 min = 1 lunar day !
forces of sun and moon add at full and new moon to produce spring tides.
forces of sun and moon compete at half moon to produce neap tides.
tides occur twice a day (semidiurnal tides), solar tides once a day (diurnal
on the orbital position of sun and moon and ocean region, mixed tides occur.
Tides are amphidromic
motion - Tides revolve around a single point
where the water level does not change known as the amphidromic
highest tidal range in the world occurs in the Bay of Fundy, Nova Scotia,
Canada. Tidal range = 15 m / 50 feet
more information see http://www-class.unl.edu/geol109/tides.htm