The Clock(s) at the Center of the Universe - xyHt
Accurate Global Time Synchronization
United States Naval Observatory - Wikipedia
Network Time Protocol - an overview | ScienceDirect Topics
NTP Server | atomic-clock.galleon.eu.com
How the U.S. Built the World's Most Ridiculously Accurate Atomic Clock | WIRED
Knowledge Center
The U.S. Naval Observatory Master Clock | The DC Bike Blogger
The Clock(s) at the Center of the Universe - xyHt
National Institute of Standards and Technology | NIST
USNO's Precise Time services
GPS Clock with NTP time server
Network Time Protocol - an overview | ScienceDirect Topics
Where Time Begins - Long Now
US Army Atomic Clock - Wall Of Clocks
What is Stratum 1? | EndRun Technologies
What You Need to Know About NTP Security - PCI DSS GUIDE
The Thorny Problem of Keeping the Internet's Time | The New Yorker
The USNO Master Clock
United States Naval Observatory - Wikipedia
NTP Server: Free Public Internet Time Servers | TimeTools
