Six-year-old Hannah Guerra of Elgin asks astronomy expert Robb Walker about the Transit of Venus Tuesday on the grounds of the Elgin School District U46 Planetarium in Elgin. June 5, 2012 | Michael Smart~Sun-Times Media

Carol Tuttle, wife of the late Don Tuttle who was the first director of the planetarium, stands next to her son Rich as she gazes at the sun through a pair of special glasses Tuesday at the Elgin School District U46 Planetarium. June 5, 2012 | Michael Smart~Sun-Times Media

An image of Venus crossing in front of the sun can be seen through the projection of the U46 planetarium's telescope Tuesday night in Elgin. June 5, 2012 | Michael Smart~Sun-Times Media

Aileen Rios, 12, looks at the to the sky using special glasses with her father Daniel Rios Tuesday evening on the Elgin School District U46 Planetarium grounds to observe the planet Venus crossing in front of the sun. The occurence happens twice in a century and they call it Transit of Venus. June 5, 2012 | Michael Smart~Sun-Times Media

Caden Oine, 3, looks through a telescope to look at the Transit of Venus as he is held by his mother Elizaeth Oine, Tuesday at the Elgin School District U46 Planetarium in Elgin. June 5, 2012 | Michael Smart~Sun-Times Media

Astronomy club member Bill Krauss adjusts a telescope dating back to 1910 for observation of the Transit of Venus Tuesday night at the U46 Planeterium. June 5, 2012 | Michael Smart~Sun-Times Media

Jake Henderson, 10 of elgin stands in front of his father Jeff Henderson Tuesday night at the U46 Planetarium to observe the Transit of Venus. June 5, 2012 | Michael Smart~Sun-Times Media

Jake Henderson, 10 of elgin stands in front of his father Jeff Henderson Tuesday night at the U46 Planetarium to observe the Transit of Venus. June 5, 2012 | Michael Smart~Sun-Times Media

Gary Crouse of Elgin observes the Transit of Venuse near a telescope dating back to 1910 Tuesday night at the U46 Planeterium. June 5, 2012 | Michael Smart~Sun-Times Media