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Tides are the periodical movements of seawater, through which it rises and falls in relation to a fixed reference on the ground. This phenomenon is caused by the simultaneous attraction of the sun and the moon over Earth’s waters – as well as other transient environmental factors – and it’s the variation in their position in relation to our planet that provokes tidal cycles.
Within a tidal cycle, there are two main stages (or extremes) to be considered: High Tide (or High Water) and Low Tide (or Low Water). By calculating the average of these levels in a given location, over a period of time known as National Tidal Datum Epoch (usually 19 years, which is the closest full-year count to the 18.6-year cycle of the lunar node regression), it becomes possible to retrieve information that can later be used as a basis for establishing privately owned land, exclusive economic zone, high seas boundaries, and event prevent floods.
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