Ritter Observatory was created in 1967.
Ritter Pázmán was created in 1892.
Ritter Blaubart was created in 1920.
Ritter House was created in 1796.
Ritter Toggenburg was created in 1797.
Jura Observatory was created in 1993.
Detroit Observatory was created in 1854.
Sphinx Observatory was created in 1937.
Ursa Observatory was created in 1926.
Carter Observatory was created in 1937.
Corralitos Observatory was created in 1961.
Stonyhurst Observatory was created in 1838.
Cincinnati Observatory was created in 1843.