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
Partial/total eclipses on the Moon Partial/total eclipses on the Moon Partial/total Solar eclipses on the Moon are caused when the Earth passes in front of the Sun, blocking a part its light in one part and the whole light in the other. Viewers on Earth will see a partial lunar eclipse. During its eclipses, the Earth will be in new phase, completely dark, except for moonshine and sunlight refracted through the earth's atmosphere, visible as a ring of light. The next partial-total solar eclipse on the Moon will be partial-total on August 7, 2017 with the southern portion of the Southern Hemisphere seeing totality. Seen