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. 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 … Frequency/latency: produced every six hours, available three hours after center epoch. 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 Global Positioning System Overview USNO GPS Data Categories Explanation USNO GPS Time Transfer Leap Seconds GPS Information: SA, DGPS, Leap Seconds, etc. 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. Add this clock like this to your home page! Naval Observatory Master Clock Ten Second Hack, Refresh if needed May be slow to get updated! The United States Naval Observatory (USNO) and the National Institute of Standards and Technology (NIST) make regular comparisons of their respective time scales. 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. 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) . Netscape does. 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 Control Segment uses this offset to steer GPS Time to UTC(USNO) • GPS Broadcasts Correction of UTC offset. I will try to find a fix. The control center periodically coordinates the atomic clocks of each GPS satellite. Microsoft Explorer seems not to work with this version. Naval Observatory (USNO) maintains UTC time at its control center in Colorado. GPS Week Number Rollover GPS Timing Data and Information USNO Computer Display Clocks Pick your time zone for time. Converting from Universal Time. File names (by example): usu15002_18.sp3: 48-hr orbit/clock file with center date GPS week 1500, day 2 (Tuesday), hour 18 (GPST) The U.S. Official US time Universal Time Auto Set PC clock ; U.S. 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. The government distributes UTC as maintained by the U.S. before date = post-processed. ―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. USNO ensures that the GPS signal has a time transfer accuracy of ≤40 nanoseconds (one thousand-millionths of a second) 95% of the time. GPS time transfer is a common method for synchronizing clocks and networks to Coordinated Universal Time (UTC). after date = predict. These comparisons are made using GPS common-view measurements from up to approximately 10 GPS satellites. Listen to a "live" broadcast of the USNO Master Clock Voice Announcer! File name indicates center date/time of 48-hr span. 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)

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