Related by context. Frequent words. (Click for all words.) 59 atomic clocks 55 Greenwich Mean Time 49 Gregorian calendar 47 clocks 44 Doomsday Clock 44 Daylight Saving Time 43 Daylight Savings Time 43 timekeeping 42 Daylight saving 42 Daylight Savings 41 countdown timer 41 latitude longitude 41 timekeepers 41 countdown clocks 40 vernal equinox 40 daylight saving 40 timestamp 39 parallax 39 clock 39 Daylight Saving 39 setpoint 39 Clocks 39 GMT +2 39 timestamps 39 equinox 38 periodicity 38 altimeter 38 geostationary satellites 38 timezone 38 autumnal equinox 38 1MHz 38 sunspot cycle 38 equinoxes 38 invariant 37 chronograph 37 geostationary orbit 37 pulse width 37 #h# GMT 37 datum 37 geodetic 37 #/#th [001] 36 By Fabien Montique 36 GPS satellites 36 circular orbit 36 Clock 36 Naval Observatory 35 meridian 35 chronometer 35 Atomic Scientists 35 longitudes 35 tourbillon 35 fluorescent lamp 35 microsecond 35 division multiplexing 35 Eastern Daylight Time 35 #:#:# UTC 35 min max 35 Messenger spacecraft 35 Ophiuchus 35 countdown clock 35 west longitude 35 document.write 35 Mayan calendar 34 moonrise 34 timings 34 ecliptic 34 Ushant 34 spring equinox 34 Frequency 34 TDMA 34 substorms 34 waypoint 34 longitude 34 decimal 34 satellites orbiting 34 sunspot numbers 34 Temperature 34 DST 34 observe daylight saving 33 computed 33 geosynchronous orbit 33 #ns [001] 33 Franck Cammas 33 transponder 33 Oceansat 2 33 bintx 33 umbra 33 DGPS 33 orbital 33 KJV 33 chronographs 33 divisor 33 numerals 33 circadian clock 33 interleaving 33 Forward Error Correction 32 deg 32 Outer Space Treaty 32 sunspot activity 32 timekeeper 32 frequency hopping