High Quality Content by WIKIPEDIA articles! The Cincinnati Observatory, located in Cincinnati, Ohio (USA) on top of Mt. Lookout. It consists of two observatory buildings housing an 11 inch (28 cm) and 16 inch (41 cm) aperture refracting telescope. It is the oldest professional observatory in the United States. It was a key facility for astronomical research and education at the University of Cincinnati and is still owned by the university. The observatory currently operates as a 19th century observatory. There are regular viewings through both historical telescopes as well as tours and additional programs. The observatory also has an extensive outreach program, providing astronomical education for the Ohio/Kentucky/Indiana region.