University of Pennsylvania Observatory         

Index	Maps of the Sky	Weather Watch
directions observer's resources image gallery DRL Observatory (campus) Physics department	Skymaps.com SkyandTelescope Mt. Wilson SkyView Object Lists Messier Catalog NGC Catalog Observable Comets SIMBAD NED	Wunderground CNN NE Satellite Movie IR GOES Other Goodies Planetary Satellite Plotters SOHO ISS Predictions Iridium Flares Sidereal time clock