Photo Op: The biggest full moon of 2012 called the ‘Supermoon’ or perigee full moon, will occur on Saturday, May 5, 2012, around 11:35 p.m. Eastern Daylight Time (EDT) on the eastern coast of the United States and on Sunday, May 6, at 1:35 p.m. in Sydney in New South Wales, Australia. Astronomers are estimating the supermoon will be around 14 percent brighter and 30 percent bigger than the average full moon. Full Moons from the way we see it, vary in size because of the oval orbit of the Moon. It is an ellipse with one side (perigee) about 50,000 km closer to Earth than the other (apogee). Full Moon Perigee or Supermoon Will Occur Saturday, May 5, 2012 | Z6Mag Enjoy.