LEADER 01896nam  2200385Ka 450 
001 9910690716903321
005 20221206072754.0
035   $a(CKB)5470000002341158
035   $a(OCoLC)43778858
035 9 $aocm43778858
035   $a(OCoLC)995470000002341158
035   $a(EXLCZ)995470000002341158
100   $a20000405g20009999  ua             0
101 0 $aeng
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 04$aThe Official U.S. time$b[electronic resource]
210   $a[Boulder, Colo.] $cNational Institute of Standards and Technology, Physics Laboratory, Time and Frequency Division ;$aWashington, D.C. $cU.S. Naval Observatory$d2000-
300   $aTitle from title screen.
330   $aA "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).
517 3 $aOfficial United States time
606   $aAtomic clocks
606   $aClocks and watches
606   $aTime$xSystems and standards$zUnited States
608   $aCalendars.$2lcgft
615  0$aAtomic clocks.
615  0$aClocks and watches.
615  0$aTime$xSystems and standards
712 02$aPhysics Laboratory (U.S.).$bTime and Frequency Division.
712 02$aUnited States Naval Observatory.
906   $aBOOK
912   $a9910690716903321
996   $aThe Official U.S. time$93425891
997   $aUNINA