9 Allen Washington Image: NARA & DVIDS Public Domain Archive Public Domain Search}

PH2 (AC) Scott M. Allen Washington, D.C....An astronomer operates the restored 12-inch Alvan Clark telescope (built in 1892) at the U.S. Naval Observatory. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files

PH2 (AC) Scott M. Allen Washington, D.C....A view of the 26-inch refracting telescope which looks out over the U.S. Naval Observatory's main building. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files

PH2 (AC) Scott M. Allen Washington, D.C....An astronomer looks through the 26-inch refracting telescope at the U.S. Naval Observatory. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files

PH2 (AC) Scott M. Allen Washington, D.C....An astronomer poses beside the 26-inch refracting telescope at the U.S. Naval Observatory. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files

PH2 (AC) Scott M. Allen Washington, D.C....An astronomer looks through the 26-inch refracting telescope at the U.S. Naval Observatory. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files

PH2 (AC) Scott M. Allen Washington, D.C....A mathematician at the U.S. Naval Observatory studies one of the many computers in the master clock room, where exact time is kept. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files

PH2 (AC) Scott M. Allen Washington, D.C....An exterior view of the U.S. Naval Observatory. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files

PH2 (AC) Scott M. Allen Washington, D.C....A view of a stone carving embedded in the support structure of an antique telescope at the U.S. Naval Observatory. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files

PH2 (AC) Scott M. Allen Washington, D.C....An interior view of the U.S. Naval Observatory library, one of the world's major astronomical libraries. More than 75,000 volumes are on board, some of which date back to the early 15th century. The Naval Observatory's two main functions are tracking star movements and keeping precise time. OFFICIAL U.S. NAVY PHOTO (RELEASED)

The original finding aid described this photograph as: Country: Unknown Release Status: Released to Public Combined Military Service Digital Photographic Files