The Smithsonian Astrophysical Observatory (SAO) is a research unit of the Smithsonian Institution concentrating on studies of solar radiance.
The Smithsonian Astrophysical Observatory (SAO) was established in 1890 as a research unit of the Smithsonian Institution concentrating on studies of solar radiance. Today it has close collaboration with the Harvard College Observatory and Harvard University Department of Astronomy, and the July 1, 1973 collaboration formalized as the Center for Astrophysics | Harvard & Smithsonian (CfA) under a single director.