Supermoon rising behinds a large tree on the Colorado eastern country horizon. It's called the Mega Beaver Moon in November in the United States because for both colonists and the Algonquin tribes it came at the time of the year when beaver traps were set before the swamps froze over. A supermoon may bring the largest tides of the year, but the variation is not large enough to account for earthquakes, flooding or volcanoes or for driving people insane. Astronomers don't call it a supermoon, which has no scientific basis. They call it a perigee-syzygy moon. The term supermoon was coined 30 years ago by an astrologer. Photo: © James "Bo" Insogna.