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USN 1147678 United States Naval Observatory

United States Naval Observatory
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Title: United States Naval Observatory
Caption: The six-inch transit circle is seen in operation. The fundamental positions of the sun, moon, planets, and the stars are continuously determined by transit circles, Washington, D.C., 21 April 1971.
Description:
Catalog #: USN 1147678
Copyright Owner: National Archives
Original Creator: Photographer, Chief Photographer's Mate Thomas J. Mackesy
Original Date: Wed, Apr 21, 1971
After this Year: 1970
Before this Year: 1979
Original Medium: BW Photo
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