Description: [caption id="" align="aligncenter" width="442" caption=" Instruments atop the Smithsonian Astrophysical Observatory Observing Station, Mt. St. Katherine, Egypt, The station was operational from 1933 to 1937, 1933, by Unknown photographer, Photographic print, Smithsonian Institution Archives Record Unit 7005 Box 186 Folder 5, Negative Number: 94-12576."][/caption]
Description: A daily photo highlight from Smithsonian collections. [caption id="" align="aligncenter" width="422" caption="The operation of the Baker-Nunn camera, located at the Smithsonian Station in Shiraz, Iran, is explained to Mohammed Reza Pahlavi, Shah of Iran, April 26, 1959, by Smithsonian Astrophysical Observatory, Photographic print, Smithsonian Institution Archives, Record Unit
Description: A daily photo highlight from Smithsonian collections. [caption id="" align="aligncenter" width="412" caption="Volunteer satellite trackers in Pretoria, South Africa, for Smithsonian Astrophysical Observatory's Moonwatch Network, one of more than 100 teams worldwide, 1965, by Unknown photographer, Photographic print, Smithsonian Institution Archives, Record Unit 371 Box 4
Description: [caption id="" align="aligncenter" width="430" caption="The Division of Radiation and Organisms Laboratory, located in the basement of the Smithsonian Institution Building, a division of the Smithsonian Astrophysical Observatory dedicated to studying the effects of solar radiation on organisms. Shown here is a vacuum type thermocouples of very high sensitivity, used in
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