The USNO Master Clock
Network Time Protocol - an overview | ScienceDirect Topics
How the U.S. Built the World's Most Ridiculously Accurate Atomic Clock | WIRED
The Clock(s) at the Center of the Universe - xyHt
The Thorny Problem of Keeping the Internet's Time | The New Yorker
National Institute of Standards and Technology | NIST
Where Time Begins - Long Now
NTP Server | Time Server | NTP Time Server
NETWORK TIME SERVICES
Is internet time good enough for cybersecurity? - GPS World
United States Naval Observatory - Wikipedia
The USNO Master Clock
N95- 32329 Network Time Synchronization Servers at the U. S. Naval Observatory
United States Naval Observatory - Wikipedia
NTP basic – how it works | TIMING AND FREQUENCY SOLUTIONS FOR CRITICAL SYSTEMS
Knowledge Center
New attacks on Network Time Protocol can defeat HTTPS and create chaos | Ars Technica
Cesium Atomic Clocks
What You Need to Know About NTP Security - PCI DSS GUIDE
The Clock(s) at the Center of the Universe - xyHt
Atomic Clock Systems - TimeTools Atomic Clock Systems | TimeTools Ltd
United States Naval Observatory - Wikipedia
