Perigean spring tide Perigean spring tide A proxigean spring tide (also known as a perigean spring tide) is a tide that occurs three or four times per year when the Moon's perigee (its closest point to Earth during its 29.5-day elliptical orbit) coincides with a spring tide (when the Earth, Sun and Moon are nearly aligned every two weeks). This tide usually adds only a couple of inches to normal spring tides. The Moon's orbit around Earth is elliptical, which causes the Moon to be closer to Earth and farther away at different times. The Moon and the Sun are aligned every two
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.