May 20 annular solar eclipse

On the afternoon of Sunday, May 20, the Moon will pass in front of the Sun, creating an annular solar eclipse. This won't be a total eclipse; a small ring of the Sun will still be visible. Millions of people from China through North America will be able to see the eclipse. It'll be especially visible in the southwestern United States starting around 6:30p.m. PDT.

Very important: Do not look directly at the sun! Ever! If you do not have a pair of eclipse glasses, try this:

Do-it-yourself pinhole projector
The cheapest way to view the eclipse is to get your hands on two pieces of cardboard and a pen. Take the pen and poke a hole in the center of one of the pieces of cardboard. Then stand with your back to the Sun and hold the cardboard with the hole in it up to the Sun while letting the light pass through the hole onto the other piece of cardboard.

What you'll get is an image of the Sun projected onto the cardboard. As the annular eclipse starts to happen, you'll slowly see a dark shape start to pass over the projected Sun. This is the Moon. Eventually, you'll only see a slim outline of the Sun when the eclipse reaches its height. Be careful not to look directly into the hole you poked, however; that's just as dangerous as if looking at the Sun itself.
Read more here:  http://www.tecca.com/columns/how-to-see-may-2012-solar-eclipse/