The Cincinnati Observatory, known locally as Mt. Lookout Observatory, is located in Cincinnati, Ohio (United States) on top of Mount 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.[3] It was a key facility for astronomical research and education at the University of Cincinnati and 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.[4][5]
The Merz refractor was the biggest telescope in the United States in the early 1840s.[11]
In 1871, the Observatory came under the control of the University of Cincinnati and in 1873 it was transferred from Mt. Adams to Mt. Lookout in order to escape the smoke and dirt of the city, where it remains today.[12] The ground on which it stands was given to the city by John Kilgour in 1872.[13] A smaller structure, the Mitchel Building, holds the original telescope taken from the Mount Adams observatory. The 1873 building was built by the firm of Cincinnati architect Samuel Hannaford.[14] From 1884 to 1930 the director of the Observatory was Jermain G. Porter.[15][16] In 1998 the Observatory was declared a National Historic Landmark.
The 1845 Merz und Mahler 11 inch refractor – Housed in the "Mitchel Building". May be the oldest continually used telescope in the world. It is currently used for public education programs.
The 1904 Alvan Clark & Sons 16 inch refractor – Housed in the "Herget Building". Used in public education programs and graduate research.
