Tide

Tides are the rise and fall of sea levels caused by the combined effects of gravitational forces exerted by the Moon, Sun, and rotation of the Earth.

The times and amplitude of tides at a locale are influenced by the alignment of the Sun and Moon, by the pattern of tides in the deep ocean, by the amphidromic systems of the oceans, and the shape of the coastline and near-shore bathymetry (see Timing). Some shorelines experience a semi-diurnal tide - two nearly equal high and low tides each day. Other locations experience a diurnal tide - only one high and low tide each day. A "mixed tide"; two uneven tides a day, or one high and one low, is also possible.

Tides vary on timescales ranging from hours to years due to a number of factors. To make accurate records, tide gauges at fixed stations measure the water level over time. Gauges ignore variations caused by waves with periods shorter than minutes. These data are compared to the reference (or datum) level usually called mean sea level.

Ebb tide (disambiguation)

Ebb tide means the period between high tide and low tide during which water flows away from the shore. The receding or outgoing tide. The period between high water and the succeeding low water.

The following all drew their name from the above meaning:

Ebb Tide (song)

"Ebb Tide" is a popular song, written in 1953 by the lyricist Carl Sigman and composer Robert Maxwell. An instrumental version by organist Kenneth W. Griffin was played in the fifth season premiere of the TV drama Mad Men.

The song's build up is to illustrate the ocean waves coming in and out to and from the shores, due to the ebb tides.

The first three notes are identical to the first three notes of the Erroll Garner song "Misty" (1954).

This song is not to be confused with the title song from the movie Ebb Tide (1937), which is a composition by Leo Robin and Ralph Rainger.

Recordings