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The tidal range is the vertical difference between the high tide and the succeeding low tide. Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.
Tidal oscillation has a strictly definite periodicity, which can be determined for any. required period of time. Semi-diurnal (12 hours 24 minutes), diurnal (24 hours 48 minutes) and mixed tides can. be observed on the shores of the World Ocean. The tidal amplitude varies from minimum values during quadrature (the first and the. third quarters of the Moon) to maximum in the syzygy (at new and full moon).