Tides are the most consistent variables in our surfing lives. The Ocean is always either receding or approaching your shoreline. It is a constant reminder of the geometry and power of astronomical forces. Tides erode coastlines, impact marine ecosystems and even facilitated early life leaving the sea. Rising tides can pull swell onto a beach while dropping tides can focus wave energy to a shallow sandbar or reef. Tides are caused by the gravitational dance between the Earth, Moon and Sun.
Gravity is a fundamental force that attracts every object to every other object. It’s the force that brought Newton’s apple to the ground and the force that accelerates a bodysurfer down a wave face. The more massive the object, the stronger it’s gravitational pull. The closer two objects are, the stronger the pull of gravity between them. This pull between objects is called a tidal force.