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Transit circle observations, 1924

Transit circle observations, 1924

C034/5593

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Credit

US NAVAL OBSERVATORY / SCIENCE PHOTO LIBRARY US NAVAL OBSERVATORY / SCIENCE PHOTO LIBRARY

Caption

Transit circle observations. US astronomer John Churchill Hammond (1871-1940) using the 6-inch transit circle instrument at the US Naval Observatory, Washington DC, USA. A transit instrument is used to measure the positions of the stars as they transit a pre-defined point. Photographed in 1924.

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