Clock Atomic
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 La Crosse 12 Atomic Analog Clock  US $45.35
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 La Crosse Technology WS 8117U IT Atomic Wall Clock Available in Cherry or Oak US $45.35
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 Ionic Air Purifier Ozone Ionizer Cleaner Fresh Clean Air Living Home Office New US $144.95
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 Oregon Scientific BAR388HGA Wireless Weather Station with Atomic Clock US $45.00
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 Oregon Scientific Projection Clock Temp Silver Atomic Fast Ship No Tax MSRP $30 US $9.99
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 PROJECTION CLOCK w WEATHER FORECAST REMOTE TEMPERATURE LaCrosse Technology US $20.50
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 Skyscan Atomic Automatic Clock Outdoor Temperature Black US $39.99
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 Skyscan Atomic Automatic Clock Outdoor Temperature White US $39.99
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 NEW LA CROSSE ATOMIC DIGITAL WALL CLOCK US $20.14
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 Lot of 2 Office Wall Clocks Atomic Precision Accur tothe SECOND Sets AUTOMATIC US $31.99
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 LA CROSSE WIRELESS TEMPERATURE STATION WS 7014CH IT US $9.11
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 ATOMIC CLOCK INCLUDES DATETIMETEMPERATURE DAY OF THE WEEK AND MORE US $30.00
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 Atomic Alarm Clock Never Needs Setting US $4.99
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 2 x Suitcase Combination lock Padlock Quality made US $1.56
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 La Crosse 12 Atomic Clock NIB Nice US $38.00
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 Atomic Projection Clock Digiview NEW nice Xmas Gift PCRO8W US $24.95
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 Projection Alarm Clock Weather Monitoring LCD System three included sensors US $30.95
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 OREGON SCIENTIFIC WIRELESS WTHR FORECASTER SELF SETTING ATOMIC CLOCK NIB $79 US $17.99
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 atomic dual alarm clock US $40.00
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 Sharp SPC315 Atomic Dual Alarm Clock Temperature Sensor Moon Phase Day Date US $39.99 |
 JUMBO DISPLAY RADIO CONTROLLED ATOMIC ALARM CLOCK with CalendarTemp Humidity US $25.00
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 SELF SETTING ATOMIC CLOCK THERMOMETER DATE ALARM new in box DELUXE Last one US $28.99
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 Chass Digi Companion Global Sync Atomic Clock with Digital Photo Frame US $35.00
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 LA CROSSE TECHNOLOGY RADIO CONTROLLED WALL CLOCK BLK ATOMIC MODEL WT 3102 US $14.99
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 Mid Century Modern Eames Era Wood Spool CLOCK Retro MOD US $49.99
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 New Atomic Bathroom Digital Alarm Clock With suction cup US $41.04
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 Chaney Instrument 5918A Atomix Wall Clock US $13.99
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 La Crosse Technology WT 3102B 10 Atomic Analog Clock US $19.99
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 Mainstays same as La Crosse solar powered digital atomic wall table clock NEW US $29.95
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 SHARP® ATOMIC DUAL ALARM CLOCK US $33.25
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 Nexus Wireless LED Indoor Outdoor Temperature Desktop Alarm Clock Battery Op US $11.95
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 SHARP RADIO CONTROLLED ATOMIC WALL CLOCK WITH WIRELESS OUT DOOR WEATHER SENSOR US $17.99
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 AIR PURIFIER OZONE HEPA UV BLACK COMMERCIAL CLEANER SMOKE REMOVER MOLD REMOVAL US $127.97
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 AIR PURIFIER HEPA CARBON IONIC OZONE GENERATOR CLEARNER UV C REMOTE CLEANER NEW US $127.97
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 ATOMIC DUAL ALARM CLOCK with inside outside temp US $39.00
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 RADIO CONTROLLED ATOMIC ALARM CLOCK with Calendar Temperature US $17.50
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 LARGE DIGITAL DISPLAY ATOMIC RADIO CONTROLLED LCD ALARM CLOCK US $38.50
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 New Precision Radio Controlled Colour LCD Mini Alarm Clock Travel Desktop Black US $7.89
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 Retro Atomic Machine Age Midcentury Style Ball Clock New in Box Atomic Age US $49.99
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 Atomic 12 Wall Clock Chicago Light House NIB Great for Home or Office US $9.00
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 SkyScan Atomic Clock with date and temperature US $7.42
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 ►MIB vtg 50s pastel PINK portable GOODYEAR vac ette VACUUM CLEANER w bakelite◄ US $9.99
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 La Crosse Technology WT 8005U B Atomic Digital Wall Clock w Indoor Temperature US $19.99
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 JUMBO GIANT DIGITAL ATOMIC WALL CLOCK THERMOMETER US $79.95
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 La Crosse Technology Atomic Digital Wall Clock US $24.55
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 115 Black Atomic Wall Clock Radio Controlled Mars 12D NIB US $19.99
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 NEW Hip Cool Projection Clock with Temperature Silver US $19.00
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 Acu Rite Delux Wireless Weather Station Model 00594 NO RESERVE US $9.99
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 SkyScan model 38229 1 Atomic Alarm Clock Travel US $9.99
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 La Crosse Technology Atomic Digital Wall Clock with Temp and Weather Forecast US $37.50
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 Westclox Atomic Digital Alarm Clock US $5.00
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 115 Black Atomic Wall Clock Radio Controlled Mars 24D NIB US $19.99
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 Sky Scan 87310 Sky Scan Atomic Clock MISS Wireless Outdoor Temperature SNSOR US $.99
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 SHARP ATOMIC DIGITAL RADIO CONTROLLED DUAL ALARM CLOCK TEMPERATURE NEW IN BOX US $21.99
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 Radio Controlled Weatherproof Wall Clock Thermometer Hygrometer 364277 Copper US $25.99
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 NEW SkyScan Atomic Digital Clock Indoor Outdoor Temp Sensor US $35.95
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 Atomic Projection Alarm Clock US $29.99
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 Mid Century Modern Eames Era Wood multicolor Spool CLOCK Retro MOD US $49.99
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 Cherry Atomic Wall Clock with Moon Indoor Outdoor Temperature WS 8117U IT C US $42.99
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 La Crosse Technology Atomic Digital Wall Clock with Moon Phase Temp US $32.99
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 115 Analog Atomic Clock Radio Controlled Mars 12D NIB US $11.99
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 La Crosse Technology Atomic Digital Wall Clock with Date and Temp Display US $24.99
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 GEORGE NELSON CLOCK SUNBURST modern eames era knoll accessories wall decor retro US $149.00
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 Equity by La Crosse SkyScan 31420 Travel Atomic Alarm Clock US $21.76
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 SHARP® ATOMIC DUAL ALARM CLOCK INDOOR AND OUTDOOR TEMPSENSE W WIRELESS SENSOR US $19.99
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 ACCTIM DURHAM RADIO CONTROLLED NATURAL OAK MAHOGANY WALNUT WALL CLOCK US $71.12
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 Chaney Instruments Acu Rite 75077 Wireless Weather Fore US $51.33
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 La Crosse Technology Atomic Digital Wall Clock Red Model WS 8117U IT C US $31.95
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 La Crosse Wireless Weather Station with Atomic Clock US $22.46
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 Universal Indoor Outdoor Clock Atomic 13 1 2in Black US $30.74
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 AIR PURIFIER IONIC OZONE HEPA MACHINE CARBON FRESHENER CLEANER DIGITAL REMOTE US $139.99
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 La Crosse Technology WT 3128U 12 Inch Atomic Analog Wall Clock with LCD US $41.14
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 Oregon Scientific EW96 Atomic Projection Clock with Thermometer NEW US $69.99
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 16 Mahogany Finished Analog Atomic Clock Radio Controlled Venus NIB US $27.99
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 Lacrosse Technology WS 9625TWC IT TCP CLOCK WEATHER STATION US $38.51
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 Oregon Scientific Professional Wireless Weather Station WMR100N US $165.86
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 Honeywell Personal Weather StationAtomic Alarm Clock US $49.99
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 La Crosse WT 3128U WH 12 Atomic Wall Clock w Analog and Digital Display US $35.99
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 Wireless Silver Sun Moon Forecast Station Atomic Clock with Oscar Outlook US $37.99
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 La Crosse Technology WT 3181P 18 Outdoor Atomic Wall Clock with Temperature Hum US $73.62
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GPS Atomic Clock Time Signals
It seems that nearly every car dashboard has a GPS receiver perched on the top. They have become incredibly popular as a navigational tool with many people relying on them solely to work their way around the road networks.
The Global Positioning System has been around for quite a few years now but was originally designed and built for US military applications but was extended for civilian use following an airline disaster.
Whilst it is incredibly useful and convenient a tool, the GPS systems is relatively simple in its operation. The navigation works using a constellation of 30 or so satellites (there are quite a few more that are orbiting but no longer operational).
The signals sent from the satellites contain three pieces of information that are received by the sat nav devices in our cars.
That information includes:
* The time the message was sent
* The orbital position of the satellite (known as the ephemeris)
* The general system health and orbits of the other GPS satellites (known as the almanac)
The way the navigational information is worked out is by using the information from four satellites. The time the signals left the each of the satellites is recorded by the sat nav receiver and the distance from each satellite is then worked out using this information. By using the information from four satellites it possible to work out exactly where the satellite receiver is, this process is known as triangulation.
However, working out exactly where you are in the world does rely on complete accuracy in the time signals that are broadcast by the satellites. As signals such as the GPS travel at the speed of light (approximately 300,000 km a second through a vacuum) even a one second inaccuracy could see positioning information out by 300 kilometres! Currently the GPS system is accurate to five metres which demonstrates just how accurate the timing information broadcast by the satellites is.
This high level of accuracy is possible because each GPS satellite contains atomic clocks. Atomic clocks are incredibly accurate relying on the unwavering oscillations of atoms to keep time – in fact each GPS satellite will run for over a million years before it will drift by as much as a second (compared to the average electronic watch which will drift by a second in a week or two)
Because of this high level of accuracy the atomic clocks on board GPS satellites can be used as a source of accurate time for the synchronization of computer networks and other devices that require synchronization.
Receiving this time signal requires the use of a NTP GPS server that will synchronize with the satellite and distribute the time to all devices on a network.
About the Author
Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about an NTP server or other NTP time server solution.
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