Features
  • What Time is it?
  • USNO Master Clock
  • How Many Clocks?
  • BIPM Circular T
  • Cesium Fountain
  • Linear Ion Trap
  • GPS
  • Satellite Time Transfer
  • Network Time Service
  • Telephone Time
  • Loran-C Timing
  • US Time Zones
  • Systems of Time
  • Leap Seconds
    • Highlights
  • Daily GPS Constellation Status
  • PTTI Systems & Apps Meeting
    • Popular Links
  • NEOS
  • NIST
  • USNO Home
  • ntp.org
  • Contact the USNO
  • The Sky This Week
  • Sun Rise/Set
  • Tour Info
  • Travel Directions

    • Department of the Navy U.S. Naval Observatory

    Leap Second Poll

    Animated USNO Time in Standard Time Zones

    Time GPS TWSTT NTP Loran-C

    The Official Source of Time for the Department of Defense (DoD)
    and for the Global Positioning System (GPS),
    and a Standard of Time for the United States

    Please read this Privacy and Security Notice and this Disclaimer for External Links. For Freedom of Information Act / Privacy Act questions, contact our FOIA Program Office. Our DoD Resource Locator registration number is 46042.
    Send comments on this page to webmaster@tycho.usno.navy.mil
    Visitors since 22 Jul 2003:  
    This is an Official U.S. Navy Web Site Need Help?