Earth tide lunar and the solar tidal maxima and minima (bulges and depressions) add together for the greatest tidal range at particular latitudes. At first- and third-quarter phases of the moon, lunar and solar tides are perpendicular, and the tidal range is at a minimum. The semi-diurnal tides go through one full cycle (a high and low tide) about once every 12 hours and one full cycle of maximum height (a spring and neap tide) about once every 14 days. The development of a systematic theory of Earth tides was started by George H. Darwin in 1879, and was then furthered by
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.