As people approached the corner, Crass invited them to look into either telescope for a peak at between 15 and 20 sunspots. At first glance, several people said it appeared to be a dirty lens, but Crass said those "pieces of dirt" were critical predictors of weather patterns.
"The sunspots cause more material to be ejected causing erratic weather patterns -- something people can see all over the country," Crass said.
Astronomy Associates of Lawrence coordinated the event, which drew about 200 people. Crass said the group generally sponsors events in Downtown Lawrence so the community can learn about eclipses and other solar events.
Lawrence residents Scott McKenzie and Maggie Koerth stopped by the corner for a peak at the sunspots. Koerth said she was glad to see the community involvement.
"I think it's neat that they give people a chance to see things like this that we couldn't view otherwise," Koerth said.
Sunspot watching began at 10 a.m. and lasted throughout the day. The group then relocated to Clinton Park at 8:30 p.m. for a star-watching party.
Crass said he expected to have more events for next year's National Astronomy Day.
"We hope to plan even more community involvement," Crass said. "We want to have people lined up all down Mass. Street to show just how far apart the planets are."