File:Usno-amc.jpg
Size of this preview: 800 × 413 pixels. Other resolutions: 320 × 165 pixels | 640 × 330 pixels | 1,197 × 618 pixels.
Original file (1,197 × 618 pixels, file size: 224 KB, MIME type: image/jpeg)
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This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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Summary
| Description |
English: The US Naval Observatory (USNO) Alternate Master Clock at Schriever Air Force Base, Colorado. This serves as an alternate to the master clock ensemble at USNO, Washington, D.C., to determine the time standard for the United States Department of Defense, and also contributes to the international atomic time standard UTC. It consists of an ensemble of caesium beam atomic clocks which are all compared with each other to keep them synchronized. It serves as a Stratum 0 time server for the Network Time Protocol (NTP). |
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| Source | http://www.af.mil/shared/media/photodb/photos/060104-F-3966R-005.jpg |
| Author | US Air Force |
Licensing
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This image or file is a work of a U.S. Air Force Airman or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image or file is in the public domain in the United States.
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
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| current | 10:27, 3 October 2018 | 1,197 × 618 (224 KB) | Smalljim | Removed fisheye distortion and patched unimportant areas (floor and ceiling). There's an area missing on the right, but I think this is preferable to cropping so that the word "CLOCK" at top of cabinet is retained. |
File usage
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