TAG: Alternate Master Clock

Next-Generation Clock Increases Stability to 300 Picoseconds

February 11, 2014By
Schreiver-Master-Clock-O

The U.S. Naval Observatory’s Alternate Master Clock on Schriever Air Force Base received its second rubidium fountain clock February 4 to ensure it has the most precise time in the world. Both the USNO’s Washington D.C.-based primary and its local Alternate Master Clock facility serve as the Department of Defense’s common time reference. Additionally, the USNO monitors the GPS constellation... read more