Landolt Astronomical Observatory

The Landolt Astronomical Observatory is an astronomical observatory located on the roof of Nicholson Hall at Louisiana State University (LSU) in Baton Rouge, Louisiana, United States. Operated by LSU's Department of Physics and Astronomy, the observatory houses a rare and historic 11.5-inch Alvan Clark & Sons refracting telescope, one of the few remaining large refractors of its type still in use.