Tides are the rise and fall of sea levels caused mainly by the gravitational pull of the Moon1 and, to a lesser extent, the Sun.

Most coastlines experience two high tides and two low tides each day.

Tides are the rise and fall of sea levels caused mainly by the gravitational pull of the Moon1 and, to a lesser extent, the Sun.

Most coastlines experience two high tides and two low tides each day.

Spring tides — the largest — happen when the Sun and Moon align, adding their gravitational pull together.

Neap tides are the smallest and occur when the Sun and Moon are at right angles.

Spring tides — the largest — happen when the Sun and Moon align, adding their gravitational pull together.

Neap tides are the smallest and occur when the Sun and Moon are at right angles.