Priming and Lagging

Each port has an ‘Establishment’, being the hour of the day (GMT) at which the High Tide occurs at the ‘Full and Change’ of the Moon. At Harich this is xxx.

As the Moon moves through her quarters the time at which HW occurs changes. After the New Moon the Moon ‘waxes’ or enlarges through her ‘First Quarter’ towards the ‘Half Moon’.

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