Definition
Arises because the ocean's response to the tide-generating potential is not instantaneous; friction and basin inertia impose a phase lag. Quantitatively it is proportional to the difference between the S2 and M2 phase lags at the port. Values of roughly one to two days are common in north-west Europe, so the highest spring range often falls a day or two after the syzygy date shown in an almanac.
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