A wonderful astronomical event will occur tomorrow night as the full moon coincides with the so-called lunar perigee. The two events will create a moon that will appear to loom larger and brighter than usual. Astronomers call it extreme supermoon. Sounds like martial arts. But chances are you will like this show. The little diagram above is very helpful in understanding the phenomenon. Click on it a couple of times to make it much larger. The event typically causes greater than usual high and low tides. Lunar perigees were previously visible in 1955, 1974, 1992 and 2005 but not with full moons.