• What Time is it?
  • USNO Master Clock
  • GPS
  • Satellite Time Transfer
  • Network Time Service
  • Telephone Time
  • US Time Zones
  • Systems of Time
  • Leap Seconds
  • Highlights
  • Daily GPS Constellation Status
  • PTTI Systems & Apps Meeting
  • Recent Staff Publications
  • Popular Links
    Popular Links
  • Moon Phase Image
  • 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

    US Naval Observatory Precise Time Department

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

    The U.S. Naval Observatory's products are migrating to larger portal http://www.usno.navy.mil
    Current clock displays and lunar phase images which use direct links to tycho.usno.navy.mil may at some point no longer be available.
    DoD customers are directed to our NIPRNet site at https://naval.oceanography.navy.mil.

    Animated USNO Time in Standard Time Zones


    Send comments on this page to Precise Time Dept., USNO