For the table of chart datums and standard levels in the Port of London, please click here. All heights are in metres above local chart datum. All times are given in Greenwich Mean Time so please remember to add an hour during British Summer Time.
Tide tables give the high and low water times and heights for particular locations as shown by the example table below. Neap comes from a Greek word meaning scanty. Since the combined tidal force is decreased the high tides are lower and the low tides are higher than average. The gravitational forces of the moon and the sun counteract each other. The tides of decreased range occurring near the times of first and third quarter phases of the moon. Spring tides is a term which implies a welling up of the water and bears no relationship to the season of the year. Since the combined tidal force is increased the high tides are higher and the low tides are lower than average. The gravitational forces of the moon and the sun act to reinforce each other.
The tides of increased range occurring near the times of full moon and new moon. The gravitational forces of the moon and sun create areas of high and low water on the earth's surface. As the earth rotates the location of high and low tide changes. The moon has the greatest effect on the water compared with the sun due to its proximity to the earth and the configuration of the sun and moon, whether aligned or offset, has an effect on the tidal range.
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