Everyone's talking about tonight's supermoon—how big, bright, and beautiful it will be. It's always the same. But how big is it going to be, exactly? This image shows how much the moon size varies in the sky from its perigee (it's closest point to Earth) to its apogee (the furthest point from Earth.)
On the comparison shot—made by Catalin Paduraru and featured in NASA's Astronomy Picture of the Day—you can see a supermoon captured on May 5th, 2012 on the left, and the micromoon on the right, the full moon at its apogee captured on November 28th, 2012.
According to NASA, the moon will reach its full phase when it's directly opposite the sun. Apparently this is going to be at 9:38 this evening, so you know when to have your cameras ready.