The astrolabe illustrated on these pages comes from Roderick Webster and Marjorie Webster, Western Astrolabes, Historic Scientific Instruments of the Adler Planetarium and Astronomy Museum 1 (Chicago: Adler Planetarium and Astronomy Museum, 1998), p. 41. This instrument is dated ca. 1250 and its catalog reference is M-26.
Our thanks goes to the Adler Planetarium for their kind permission to use this image.
Group images appear courtesy of the participants of the workshops who took and shared their photographs.
Detail from the National Geographic Society - Palomar Observatory Sky Survey 1 (NGS-POSS1) photograph taken January 19/20, 1953 using a blue-sensitive photographic plate. Reference O-656. Courtesy of the University of Wisconsin-Madison Astronomy Department. Please click here to view the detail image in a new window.