The National Institute of Standards and Technology - Time and Frequency Division maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time … The United States Naval Observatory (USNO) and the National Institute of Standards and Technology (NIST) make regular comparisons of their respective time scales. Add this clock like this to your home page! Listen to a "live" broadcast of the USNO Master Clock Voice Announcer! GPS Week Number Rollover GPS Timing Data and Information USNO Computer Display Clocks File name indicates center date/time of 48-hr span. GPS, Global Positioning System time, is the atomic time scale implemented by the atomic clocks in the GPS ground control stations and the GPS satellites themselves. Naval Observatory (USNO) maintains UTC time at its control center in Colorado. The control center periodically coordinates the atomic clocks of each GPS satellite. before date = post-processed. Naval Observatory (USNO) via the GPS signal in space with a time transfer accuracy relative to UTC(USNO) of ≤40 nanoseconds (billionths of a second), 95% of the time. I will try to find a fix. USNO ensures that the GPS signal has a time transfer accuracy of ≤40 nanoseconds (one thousand-millionths of a second) 95% of the time. These comparisons are made using GPS common-view measurements from up to approximately 10 GPS satellites. Microsoft Explorer seems not to work with this version. The government distributes UTC as maintained by the U.S. GPS Time and Navigation Each GPS satellite carries Atomic clocks that are precisely synchronized to a common time scale “GPS Time” GPS Time is kept in closet alignment with UTC(USNO), typically within 10 nanoseconds Each GPS satellite also broadcasts its precise position in space (typically better than one meter) The U.S. Global Positioning System Overview USNO GPS Data Categories Explanation USNO GPS Time Transfer Leap Seconds GPS Information: SA, DGPS, Leap Seconds, etc. Pick your time zone for time. Requires RealPlayer® Because it's buffered by the RealAudio® player, the audio time will be delayed (late) by at least four seconds from when it left the USNO Master Clock time. after date = predict. CGSIC 2008, Sept 16 6 GPS Time and UTC Timing Service • GPS Time counts in weeks and seconds of a week from midnight of January 5/6, 1980 UTC • Weeks begin at the Saturday/Sunday transition GPS time transfer is a common method for synchronizing clocks and networks to Coordinated Universal Time (UTC). • GPS Control Segment uses this offset to steer GPS Time to UTC(USNO) • GPS Broadcasts Correction of UTC offset. Official US time Universal Time Auto Set PC clock ; U.S. Converting from Universal Time. Netscape does. Frequency/latency: produced every six hours, available three hours after center epoch. The exact difference is contained in the navigation message in the form of two constants, A0 and A1, giving the time difference and rate of system time against UTC(USNO,MC). GPS Timing UTC Time ―The UTC broadcast from GPS is referenced to the U. S. Naval Observatory real-time realization of UTC called UTC(USNO) . GPS system time, in turn, is referenced to the Master Clock (MC) at the USNO and steered to UTC(USNO) from which system time will not deviate by more than one microsecond. Naval Observatory Master Clock Ten Second Hack, Refresh if needed May be slow to get updated! File names (by example): usu15002_18.sp3: 48-hr orbit/clock file with center date GPS week 1500, day 2 (Tuesday), hour 18 (GPST) ―UTC(USNO) is obtained from GPS by subtracting an integral number of seconds (leap seconds) and applying the fine UTC correction information contained in the broadcast navigation data.