Earth tide or body tide is the small (<1 metre) motion of the Earth's surface at periods of about 12 hours and longer. The motion is caused by the gravity of the Moon and Sun. The largest body tide constituents are semi-diurnal, but there are also significant diurnal, semi-annual, and fortnightly contributions. Though the gravitational forcing causing earth tides and ocean tides is the same, the responses are quite different.
Read more about Earth Tide: Tidal Forcing, Body Tide, Other Earth Tide Contributors, Tidal Constituents, Earth Tide Effects
Famous quotes containing the words earth and/or tide:
“Every year lays more earth upon us, which weighs us down from aerial regions, till we go under the earth at last.”
—E.T.A.W. (Ernst Theodor Amadeus Wilhelm)
“The tide rises, the tide falls,
The twilight darkens, the curlew calls;
Along the sea-sands damp and brown
The traveler hastens toward the town,
And the tide rises, the tide falls.”
—Henry Wadsworth Longfellow (1809–1882)