At 11:34pm EDT Saturday, that's 9:34 p.m. in Costa Rica, May's full moon will reach perigee -- the closest point to Earth in its elliptical pattern -- and one minute later, the moon will line up with the Earth and the Sun.
The moon will appear 14% larger than other full moons of 2012. This sounds like there may be a few people out on the beaches with bonfires tonight.
Some say that it will be 30% brighter, yes, but that's 30% brighter than the moon is when it is at "apogee" -- the farthest point in its elliptical orbit around the Earth. Either way it will be closer and brighter than any other time in the last 10 years.
So Saturday night, try to catch a glimpse of the super moon when it's most likely to appear maxed out -- just as it's rising. This full moon should leave you at least 14% more impressed.