USNO-front-gate-DC-156-GPS-15-Inch-Led-GPS-Clock
Clocks

USNO Large 15.0″ Digital Atomic Clocks Keep National Time Standard

The USNO United States Naval Observatory (the standard in time keeping) purchased (2) DC-156-GPS Red LED atomic digital clocks for their combined accuracy of the atomic clock time keeping and the incredible viewing distance of 15.0″ high Red LED digits. They were installed at the entrance to the Washington DC …