EntityQ3348346· pop 5· linked from 240 articlesAstronomical ObservatorySign in to saveobservatory at the University of Illinois Urbana-ChampaignConnectionsUniversity of Illinois Urbana–ChampaignEntityapparent magnitudeEntityrefracting telescopeEntitybalusterEntityastronomyEntitySolar SystemEntityIndianaEntitygeographic coordinate systemEntityseleniumEntityClevelandEntityWayback MachineEntityHalley's CometEntityInternational Standard Serial NumberEntitylimestoneEntityPDFEntityInternational Astronomical UnionEntitySputnik 1Entityphotoelectric effectEntityUniversity of California, BerkeleyEntityUniversity of ChicagoEntityCategoriesAstronomical observatories in IllinoisBuildings and structures in Urbana, IllinoisNational Historic Landmarks in IllinoisNational Register of Historic Places in Champaign County, IllinoisUniversity and college astronomical observatoriesUniversity and college buildings completed in 1896University and college buildings on the National Register of Historic Places in IllinoisUniversity of Illinois Urbana-Champaign buildings and structures