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Picture uploaded by alibrarian on May 2, 2007.
Copyright: "I, the copyright holder of this work, hereby release it into the public domain" Wikipedia Commons
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Picture uploaded by alibrarian on May 2, 2007.
Copyright: "I, the copyright holder of this work, hereby release it into the public domain" Wikipedia Commons
Museum of the Royal Greenwich Observatory, London
(Credit: Klaus-Dieter Keller, 2006)