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
Empty Cities of the Full Moon Empty Cities of the Full Moon Empty Cities of the Full Moon is a science fiction novel by Howard V. Hendrix first published in 2001. The novel revolves around the near extinction of humanity by an artificial prion originally designed to help the mentally ill but which becomes a shamanistic pandemic of madness, shape-shifting and death. There are 2 plots-lines which each follow the same set of characters before and after this near extinction. The title of the novel comes from both the correlation between the pandemic's symptoms and the full moon, and that the pandemic effectively emptied the cities.