01896nam 2200385Ka 450 991069071690332120221206072754.0(CKB)5470000002341158(OCoLC)43778858ocm43778858(OCoLC)995470000002341158(EXLCZ)99547000000234115820000405g20009999 ua 0engtxtrdacontentcrdamediacrrdacarrierThe Official U.S. time[electronic resource][Boulder, Colo.] National Institute of Standards and Technology, Physics Laboratory, Time and Frequency Division ;Washington, D.C. U.S. Naval Observatory2000-Title from title screen.A "clickable" time zone map of the United States takes the user to another screen that shows the correct time for states in that time zone. The "time exhibits" link takes the user to government and non-government sites showing various ways time has been measured over the centuries. These sites include: A walk through time (history of timekeeping); Calendars through the ages (with information on days, weeks, months, and years); Daylight saving time; ClockWorks (shows clock mechanisms); It's about time (advances in timekeeping accuracy and atomic clocks); and the Quartz Watch (inside the wristwatch).Official United States timeAtomic clocksClocks and watchesTimeSystems and standardsUnited StatesCalendars.lcgftAtomic clocks.Clocks and watches.TimeSystems and standardsPhysics Laboratory (U.S.).Time and Frequency Division.United States Naval Observatory.BOOK9910690716903321The Official U.S. time3425891UNINA