Copy of a photo of Steward Observatory March 1930, photo by R.B. Streets, department of Plant Pathology University of Arizona, Special Collections
1923 Steward Observatory opens on the UA campus
The building with a 36-inch telescope, first proposed by noted scientist Andrew Ellicott Douglass in 1916, was delayed in part because of World War I. Funded by Lavinia Steward, it helped focus attention on Tucson and by 1967 the community was labeled “the astronomy center of the world.”

