Harvard-Smithsonian Center for Astrophysics, by Unknown, c. 1985, Smithsonian Archives - History Div, The Harvard College Observatory located in Cambridge, Massachusetts where SAO's scientific headquarters in Washington, D.C., moved after fhe Smithsonian Astrophysical Observatory (SAO) and Harvard College Observatory established a relationship between the two observatories in 1955. By moving the SAO to the Harvard College Observatory, the Smithsonian would gain access to the network of solar research stations operated by Harvard. On July 1, 1973, the Smithsonian Astrophysical Observatory merged with the Harvard College Observatory to become the Harvard-Smithsonian Center for Astrophysics, or CFA..