With a date-line of May 21,2019 read the digital Sky and Telescope where Jeffrey Kretsch tells how the Analemma Society helped turn a former Cold War misile control site into a thriving observatory park.  Back in the 60's Turner farm was part dairy farm and part missile control site operated by the U.S. Army.  In 1961, the complex with its buildings and radar structures was turned over to the U.S. Army Map Service, which a decade later became the Defense Mapping Agency with a charter to accurately measure the earth's gravitational field my tracking satellites.  How did Observatory Park come about?  Click hereThe Making of Turner Farm Observatory in Star-Gazers Corner of Sky and Telescope.