Earth tide Earth tide Earth tide (also known as solid Earth tide, crustal tide, body tide, bodily tide or land tide) is the displacement of the solid earth's surface caused by the gravity of the Moon and Sun. Its main component has meter-level amplitude at periods of about 12 hours and longer. 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. The larger of the periodic gravitational forces is from the Moon but that of the
Full moon in the sky.) Thus, there is no long period of darkness between sunset and moonrise for several days after the full moon, thus lengthening the time in the evening when there is enough light for men to see to work to get the harvest in. The "Maine Farmers' Almanac" from c. the 1930s began to publish Native American "Indian" full moon names. The "Farmers' Almanac" (since 1955 published in Maine, but not the same publication as the "Maine Farmers' Almanac") continues to do so. An early list of "Indian month names" was published in 1918 by Daniel Carter Beard in