A SuperMoon is planetary in scale, being a special alignment of Earth, Sun and Moon. By the same token, it’s planetary in scope, in the sense that there's no place on Earth not subject to the tidal force of the perigee-syzygy. Of course, earthquakes and volcanic eruptions don't go...
RD – relative distance: Moon’s distance to Earth of the given date / Moon’s average distance. The Moon’s average distance to Earth is 384,400 km. The percentage of how the Supermoon will look bigger than an average full moon ((1/RD)2). That percentage also shows how brighter is...