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Time signals are an important byproduct of the Global Positioning System (GPS), and indeed this has become the premier satellite source for time signals. The time scale operated by the USNO serves as reference for GPS, but it is important to note that the time scales of NIST and USNO are highly coordinated (that is, synchronized to well within 100 nanoseconds, or 100 billionths of a second). Thus, signals provided by either NIST or USNO can be considered as traceable to both institutions. The agreements and coordination of time between these two institutions are important to the country, since they simplify the process of achieving legal traceability when regulations require it.

Set Your Computer Clock Via the Internet
NIST Internet Time Service (ITS)
  → Software and Instructions ←

Set Your Computer's Clock Via the Telephone
NIST Automated Computer Time Service (ACTS)
  → Software ←

USNO NTP NETWORK TIME SERVERS

A Walk Through Time
The Evolution of Time Measurement through the Ages

• Ancient Calendars
• Early Clocks
• A Revolution in Timekeeping
• The "Atomic" Age
• World Time Scales and Time Zones
• NIST Time Services
• Bibliography

Seems to have the same background picture as sbove, & "overlapping" text — i.e. at best they are from the same source, at worst one has plagirized from the other.

• Does anybody really know what time it is?
• Time leak
• Timeline

http://tycho.usno.navy.mil/gpsinfo.html

USNO NAVSTAR Global Positioning System

International Time Scales and the B.I.P.M.

Bureau International des Poids et Mesures (International Bureau of Weights and Measures [BIPM]) in Sevres, France