The solar eclipse of 2012 MAY 20 will be annular for portions of the western USA, but will be partial for Chicagoland. The partial eclipse will begin at 19:22 CDT for Chicago observers. By the time that the Sun sets, its diameter will be 61.5% covered by the Moon.
WARNING: To avoid severe damage to your eyes, do not view the eclipse directly. The projection method is recommended.
I’ve created two preview graphics of the eclipse as viewed from Chicago’s Adler Planetarium. The first is for the beginning of the eclipse, and the second is for shortly before sunset. They can be seen at www.CurtRenz.com/moon